aboutsummaryrefslogtreecommitdiff
path: root/configure.ac
blob: 313b8477931580c832e34a280ac7d347cef77693 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
AC_PREREQ([2.69])
define(_CLIENT_VERSION_MAJOR, 23)
define(_CLIENT_VERSION_MINOR, 1)
define(_CLIENT_VERSION_BUILD, 0)
define(_CLIENT_VERSION_RC, 0)
define(_CLIENT_VERSION_IS_RELEASE, true)
define(_COPYRIGHT_YEAR, 2022)
define(_COPYRIGHT_HOLDERS,[The %s developers])
define(_COPYRIGHT_HOLDERS_SUBSTITUTION,[[Bitcoin Core]])
AC_INIT([Bitcoin Core],m4_join([.], _CLIENT_VERSION_MAJOR, _CLIENT_VERSION_MINOR, _CLIENT_VERSION_BUILD)m4_if(_CLIENT_VERSION_RC, [0], [], [rc]_CLIENT_VERSION_RC),[https://github.com/bitcoin/bitcoin/issues],[bitcoin],[https://bitcoincore.org/])
AC_CONFIG_SRCDIR([src/validation.cpp])
AC_CONFIG_HEADERS([src/config/bitcoin-config.h])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIR([build-aux/m4])

m4_ifndef([PKG_PROG_PKG_CONFIG], [m4_fatal([PKG_PROG_PKG_CONFIG macro not found. Please install pkg-config and re-run autogen.sh])])
PKG_PROG_PKG_CONFIG
if test "$PKG_CONFIG" = ""; then
  AC_MSG_ERROR([pkg-config not found])
fi

BITCOIN_DAEMON_NAME=bitcoind
BITCOIN_GUI_NAME=bitcoin-qt
BITCOIN_CLI_NAME=bitcoin-cli
BITCOIN_TX_NAME=bitcoin-tx
BITCOIN_UTIL_NAME=bitcoin-util
BITCOIN_WALLET_TOOL_NAME=bitcoin-wallet
dnl Multi Process
BITCOIN_MP_NODE_NAME=bitcoin-node
BITCOIN_MP_GUI_NAME=bitcoin-gui

dnl Unless the user specified ARFLAGS, force it to be cr
AC_ARG_VAR([ARFLAGS], [Flags for the archiver, defaults to <cr> if not set])
if test "${ARFLAGS+set}" != "set"; then
  ARFLAGS="cr"
fi

AC_CANONICAL_HOST

AH_TOP([#ifndef BITCOIN_CONFIG_H])
AH_TOP([#define BITCOIN_CONFIG_H])
AH_BOTTOM([#endif //BITCOIN_CONFIG_H])

dnl faketime breaks configure and is only needed for make. Disable it here.
unset FAKETIME

dnl Automake init set-up and checks
AM_INIT_AUTOMAKE([1.13 no-define subdir-objects foreign])

dnl faketime messes with timestamps and causes configure to be re-run.
dnl --disable-maintainer-mode can be used to bypass this.
AM_MAINTAINER_MODE([enable])

dnl make the compilation flags quiet unless V=1 is used
AM_SILENT_RULES([yes])

dnl Compiler checks (here before libtool).
if test "${CXXFLAGS+set}" = "set"; then
  CXXFLAGS_overridden=yes
else
  CXXFLAGS_overridden=no
fi
AC_PROG_CXX

dnl By default, libtool for mingw refuses to link static libs into a dll for
dnl fear of mixing pic/non-pic objects, and import/export complications. Since
dnl we have those under control, re-enable that functionality.
case $host in
  *mingw*)
     lt_cv_deplibs_check_method="pass_all"
  ;;
esac

AC_ARG_WITH([seccomp],
  [AS_HELP_STRING([--with-seccomp],
  [enable experimental syscall sandbox feature (-sandbox), default is yes if seccomp-bpf is detected under Linux x86_64])],
  [seccomp_found=$withval],
  [seccomp_found=auto])

dnl Require C++17 compiler (no GNU extensions)
AX_CXX_COMPILE_STDCXX([17], [noext], [mandatory])

dnl Check if -latomic is required for <std::atomic>
CHECK_ATOMIC

dnl check if additional link flags are required for std::filesystem
CHECK_FILESYSTEM

dnl Unless the user specified OBJCXX, force it to be the same as CXX. This ensures
dnl that we get the same -std flags for both.
m4_ifdef([AC_PROG_OBJCXX],[
if test "${OBJCXX+set}" = ""; then
  OBJCXX="${CXX}"
fi
AC_PROG_OBJCXX
])

dnl Since libtool 1.5.2 (released 2004-01-25), on Linux libtool no longer
dnl sets RPATH for any directories in the dynamic linker search path.
dnl See more: https://wiki.debian.org/RpathIssue
LT_PREREQ([1.5.2])
dnl Libtool init checks.
LT_INIT([pic-only win32-dll])

dnl Check/return PATH for base programs.
AC_PATH_TOOL([AR], [ar])
AC_PATH_TOOL([RANLIB], [ranlib])
AC_PATH_TOOL([STRIP], [strip])
AC_PATH_TOOL([GCOV], [gcov])
AC_PATH_TOOL([LLVM_COV], [llvm-cov])
AC_PATH_PROG([LCOV], [lcov])
dnl Python 3.6 is specified in .python-version and should be used if available, see doc/dependencies.md
AC_PATH_PROGS([PYTHON], [python3.6 python3.7 python3.8 python3.9 python3.10 python3.11 python3 python])
AC_PATH_PROG([GENHTML], [genhtml])
AC_PATH_PROG([GIT], [git])
AC_PATH_PROG([CCACHE], [ccache])
AC_PATH_PROG([XGETTEXT], [xgettext])
AC_PATH_PROG([HEXDUMP], [hexdump])
AC_PATH_TOOL([OBJCOPY], [objcopy])
AC_PATH_PROG([DOXYGEN], [doxygen])
AM_CONDITIONAL([HAVE_DOXYGEN], [test -n "$DOXYGEN"])

AC_ARG_VAR([PYTHONPATH], [Augments the default search path for python module files])

AC_ARG_ENABLE([wallet],
  [AS_HELP_STRING([--disable-wallet],
  [disable wallet (enabled by default)])],
  [enable_wallet=$enableval],
  [enable_wallet=auto])

AC_ARG_WITH([sqlite],
  [AS_HELP_STRING([--with-sqlite=yes|no|auto],
  [enable sqlite wallet support (default: auto, i.e., enabled if wallet is enabled and sqlite is found)])],
  [use_sqlite=$withval],
  [use_sqlite=auto])

AC_ARG_WITH([bdb],
  [AS_HELP_STRING([--without-bdb],
  [disable bdb wallet support (default is enabled if wallet is enabled)])],
  [use_bdb=$withval],
  [use_bdb=auto])

AC_ARG_ENABLE([usdt],
  [AS_HELP_STRING([--enable-usdt],
  [enable tracepoints for Userspace, Statically Defined Tracing (default is yes if sys/sdt.h is found)])],
  [use_usdt=$enableval],
  [use_usdt=yes])

AC_ARG_WITH([miniupnpc],
  [AS_HELP_STRING([--with-miniupnpc],
  [enable UPNP (default is yes if libminiupnpc is found)])],
  [use_upnp=$withval],
  [use_upnp=auto])

AC_ARG_ENABLE([upnp-default],
  [AS_HELP_STRING([--enable-upnp-default],
  [if UPNP is enabled, turn it on at startup (default is no)])],
  [use_upnp_default=$enableval],
  [use_upnp_default=no])

AC_ARG_WITH([natpmp],
            [AS_HELP_STRING([--with-natpmp],
                            [enable NAT-PMP (default is yes if libnatpmp is found)])],
            [use_natpmp=$withval],
            [use_natpmp=auto])

AC_ARG_ENABLE([natpmp-default],
              [AS_HELP_STRING([--enable-natpmp-default],
                              [if NAT-PMP is enabled, turn it on at startup (default is no)])],
              [use_natpmp_default=$enableval],
              [use_natpmp_default=no])

AC_ARG_ENABLE(tests,
    AS_HELP_STRING([--disable-tests],[do not compile tests (default is to compile)]),
    [use_tests=$enableval],
    [use_tests=yes])

AC_ARG_ENABLE(gui-tests,
    AS_HELP_STRING([--disable-gui-tests],[do not compile GUI tests (default is to compile if GUI and tests enabled)]),
    [use_gui_tests=$enableval],
    [use_gui_tests=$use_tests])

AC_ARG_ENABLE(bench,
    AS_HELP_STRING([--disable-bench],[do not compile benchmarks (default is to compile)]),
    [use_bench=$enableval],
    [use_bench=yes])

AC_ARG_ENABLE([extended-functional-tests],
    AS_HELP_STRING([--enable-extended-functional-tests],[enable expensive functional tests when using lcov (default no)]),
    [use_extended_functional_tests=$enableval],
    [use_extended_functional_tests=no])

AC_ARG_ENABLE([fuzz],
    AS_HELP_STRING([--enable-fuzz],
    [build for fuzzing (default no). enabling this will disable all other targets and override --{enable,disable}-fuzz-binary]),
    [enable_fuzz=$enableval],
    [enable_fuzz=no])

AC_ARG_ENABLE([fuzz-binary],
    AS_HELP_STRING([--enable-fuzz-binary],
    [enable building of fuzz binary (default yes).]),
    [enable_fuzz_binary=$enableval],
    [enable_fuzz_binary=yes])

AC_ARG_WITH([qrencode],
  [AS_HELP_STRING([--with-qrencode],
  [enable QR code support (default is yes if qt is enabled and libqrencode is found)])],
  [use_qr=$withval],
  [use_qr=auto])

AC_ARG_ENABLE([hardening],
  [AS_HELP_STRING([--disable-hardening],
  [do not attempt to harden the resulting executables (default is to harden when possible)])],
  [use_hardening=$enableval],
  [use_hardening=auto])

AC_ARG_ENABLE([reduce-exports],
  [AS_HELP_STRING([--enable-reduce-exports],
  [attempt to reduce exported symbols in the resulting executables (default is no)])],
  [use_reduce_exports=$enableval],
  [use_reduce_exports=no])

AC_ARG_ENABLE([ccache],
  [AS_HELP_STRING([--disable-ccache],
  [do not use ccache for building (default is to use if found)])],
  [use_ccache=$enableval],
  [use_ccache=auto])

dnl Suppress warnings from external headers (e.g. Boost, Qt).
dnl May be useful if warnings from external headers clutter the build output
dnl too much, so that it becomes difficult to spot Bitcoin Core warnings
dnl or if they cause a build failure with --enable-werror.
AC_ARG_ENABLE([suppress-external-warnings],
  [AS_HELP_STRING([--enable-suppress-external-warnings],
                  [Suppress warnings from external headers (default is no)])],
  [suppress_external_warnings=$enableval],
  [suppress_external_warnings=no])

AC_ARG_ENABLE([lcov],
  [AS_HELP_STRING([--enable-lcov],
  [enable lcov testing (default is no)])],
  [use_lcov=$enableval],
  [use_lcov=no])

AC_ARG_ENABLE([lcov-branch-coverage],
  [AS_HELP_STRING([--enable-lcov-branch-coverage],
  [enable lcov testing branch coverage (default is no)])],
  [use_lcov_branch=yes],
  [use_lcov_branch=no])

AC_ARG_ENABLE([threadlocal],
  [AS_HELP_STRING([--enable-threadlocal],
  [enable features that depend on the c++ thread_local keyword (currently just thread names in debug logs). (default is to enable if there is platform support)])],
  [use_thread_local=$enableval],
  [use_thread_local=auto])

AC_ARG_ENABLE([asm],
  [AS_HELP_STRING([--disable-asm],
  [disable assembly routines (enabled by default)])],
  [use_asm=$enableval],
  [use_asm=yes])

if test "$use_asm" = "yes"; then
  AC_DEFINE([USE_ASM], [1], [Define this symbol to build in assembly routines])
fi

AC_ARG_ENABLE([zmq],
  [AS_HELP_STRING([--disable-zmq],
  [disable ZMQ notifications])],
  [use_zmq=$enableval],
  [use_zmq=yes])

AC_ARG_WITH([libmultiprocess],
  [AS_HELP_STRING([--with-libmultiprocess=yes|no|auto],
  [Build with libmultiprocess library. (default: auto, i.e. detect with pkg-config)])],
  [with_libmultiprocess=$withval],
  [with_libmultiprocess=auto])

AC_ARG_WITH([mpgen],
  [AS_HELP_STRING([--with-mpgen=yes|no|auto|PREFIX],
  [Build with libmultiprocess codegen tool. Useful to specify different libmultiprocess host system library and build system codegen tool prefixes when cross-compiling (default is host system libmultiprocess prefix)])],
  [with_mpgen=$withval],
  [with_mpgen=auto])

AC_ARG_ENABLE([multiprocess],
  [AS_HELP_STRING([--enable-multiprocess],
  [build multiprocess bitcoin-node, bitcoin-wallet, and bitcoin-gui executables in addition to monolithic bitcoind and bitcoin-qt executables. Requires libmultiprocess library. Experimental (default is no)])],
  [enable_multiprocess=$enableval],
  [enable_multiprocess=no])

AC_ARG_ENABLE(man,
    [AS_HELP_STRING([--disable-man],
                    [do not install man pages (default is to install)])],,
    enable_man=yes)
AM_CONDITIONAL([ENABLE_MAN], [test "$enable_man" != "no"])

dnl Enable debug
AC_ARG_ENABLE([debug],
    [AS_HELP_STRING([--enable-debug],
                    [use compiler flags and macros suited for debugging (default is no)])],
    [enable_debug=$enableval],
    [enable_debug=no])

dnl Enable different -fsanitize options
AC_ARG_WITH([sanitizers],
    [AS_HELP_STRING([--with-sanitizers],
                    [comma separated list of extra sanitizers to build with (default is none enabled)])],
    [use_sanitizers=$withval])

dnl Enable gprof profiling
AC_ARG_ENABLE([gprof],
    [AS_HELP_STRING([--enable-gprof],
                    [use gprof profiling compiler flags (default is no)])],
    [enable_gprof=$enableval],
    [enable_gprof=no])

dnl Turn warnings into errors
AC_ARG_ENABLE([werror],
    [AS_HELP_STRING([--enable-werror],
                    [Treat compiler warnings as errors (default is no)])],
    [enable_werror=$enableval],
    [enable_werror=no])

AC_ARG_ENABLE([external-signer],
    [AS_HELP_STRING([--enable-external-signer],[compile external signer support (default is yes, requires Boost::Process)])],
    [use_external_signer=$enableval],
    [use_external_signer=auto])

AC_ARG_ENABLE([lto],
    [AS_HELP_STRING([--enable-lto],[build using LTO (default is no)])],
    [enable_lto=$enableval],
    [enable_lto=no])

AC_LANG_PUSH([C++])

dnl Check for a flag to turn compiler warnings into errors. This is helpful for checks which may
dnl appear to succeed because by default they merely emit warnings when they fail.
dnl
dnl Note that this is not necessarily a check to see if -Werror is supported, but rather to see if
dnl a compile with -Werror can succeed. This is important because the compiler may already be
dnl warning about something unrelated, for example about some path issue. If that is the case,
dnl -Werror cannot be used because all of those warnings would be turned into errors.
AX_CHECK_COMPILE_FLAG([-Werror], [CXXFLAG_WERROR="-Werror"], [CXXFLAG_WERROR=""])

dnl Check for a flag to turn linker warnings into errors. When flags are passed to linkers via the
dnl compiler driver using a -Wl,-foo flag, linker warnings may be swallowed rather than bubbling up.
dnl See note above, the same applies here as well.
dnl
dnl LDFLAG_WERROR Should only be used when testing -Wl,*
case $host in
 *darwin*)
    AX_CHECK_LINK_FLAG([-Wl,-fatal_warnings], [LDFLAG_WERROR="-Wl,-fatal_warnings"], [LDFLAG_WERROR=""])
    ;;
  *)
    AX_CHECK_LINK_FLAG([-Wl,--fatal-warnings], [LDFLAG_WERROR="-Wl,--fatal-warnings"], [LDFLAG_WERROR=""])
    ;;
esac

if test "$enable_debug" = "yes"; then
  dnl Clear default -g -O2 flags
  if test "$CXXFLAGS_overridden" = "no"; then
  CXXFLAGS=""
  fi

  dnl Disable all optimizations
  AX_CHECK_COMPILE_FLAG([-O0], [DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -O0"], [], [$CXXFLAG_WERROR])

  dnl Prefer -g3, fall back to -g if that is unavailable.
  AX_CHECK_COMPILE_FLAG(
    [-g3],
    [DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -g3"],
    [AX_CHECK_COMPILE_FLAG([-g], [DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -g"], [], [$CXXFLAG_WERROR])],
    [$CXXFLAG_WERROR])

  AX_CHECK_PREPROC_FLAG([-DDEBUG], [DEBUG_CPPFLAGS="$DEBUG_CPPFLAGS -DDEBUG"], [], [$CXXFLAG_WERROR])
  AX_CHECK_PREPROC_FLAG([-DDEBUG_LOCKORDER], [DEBUG_CPPFLAGS="$DEBUG_CPPFLAGS -DDEBUG_LOCKORDER"], [], [$CXXFLAG_WERROR])
  AX_CHECK_PREPROC_FLAG([-DABORT_ON_FAILED_ASSUME], [DEBUG_CPPFLAGS="$DEBUG_CPPFLAGS -DABORT_ON_FAILED_ASSUME"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-ftrapv], [DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -ftrapv"], [], [$CXXFLAG_WERROR])
fi

if test "$enable_lto" = "yes"; then
  AX_CHECK_COMPILE_FLAG([-flto], [LTO_CXXFLAGS="$LTO_CXXFLAGS -flto"], [AC_MSG_ERROR([compile failed with -flto])], [$CXXFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-flto], [LTO_LDFLAGS="$LTO_LDFLAGS -flto"], [AC_MSG_ERROR([link failed with -flto])], [$CXXFLAG_WERROR])
fi

if test "$use_sanitizers" != ""; then
  dnl First check if the compiler accepts flags. If an incompatible pair like
  dnl -fsanitize=address,thread is used here, this check will fail. This will also
  dnl fail if a bad argument is passed, e.g. -fsanitize=undfeined
  AX_CHECK_COMPILE_FLAG(
    [-fsanitize=$use_sanitizers],
    [SANITIZER_CXXFLAGS="-fsanitize=$use_sanitizers"],
    [AC_MSG_ERROR([compiler did not accept requested flags])])

  dnl Some compilers (e.g. GCC) require additional libraries like libasan,
  dnl libtsan, libubsan, etc. Make sure linking still works with the sanitize
  dnl flag. This is a separate check so we can give a better error message when
  dnl the sanitize flags are supported by the compiler but the actual sanitizer
  dnl libs are missing.
  AX_CHECK_LINK_FLAG(
    [-fsanitize=$use_sanitizers],
    [SANITIZER_LDFLAGS="-fsanitize=$use_sanitizers"],
    [AC_MSG_ERROR([linker did not accept requested flags, you are missing required libraries])],
    [],
    [AC_LANG_PROGRAM([[
    #include <cstdint>
    #include <cstddef>
    extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { return 0; }
    __attribute__((weak)) // allow for libFuzzer linking
    ]],[[]])])
fi

ERROR_CXXFLAGS=
if test "$enable_werror" = "yes"; then
  if test "$CXXFLAG_WERROR" = ""; then
    AC_MSG_ERROR([enable-werror set but -Werror is not usable])
  fi
  ERROR_CXXFLAGS=$CXXFLAG_WERROR

  dnl -Wreturn-type is broken in GCC for MinGW-w64.
  dnl https://sourceforge.net/p/mingw-w64/bugs/306/
  AX_CHECK_COMPILE_FLAG([-Werror=return-type], [], [ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Wno-error=return-type"], [$CXXFLAG_WERROR],
                        [AC_LANG_SOURCE([[#include <cassert>
                                          int f(){ assert(false); }]])])
fi

if test "$CXXFLAGS_overridden" = "no"; then
  AX_CHECK_COMPILE_FLAG([-Wall], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wall"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wextra], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wextra"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wgnu], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wgnu"], [], [$CXXFLAG_WERROR])
  dnl some compilers will ignore -Wformat-security without -Wformat, so just combine the two here.
  AX_CHECK_COMPILE_FLAG([-Wformat -Wformat-security], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wformat -Wformat-security"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wvla], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wvla"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wshadow-field], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wshadow-field"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wthread-safety], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wthread-safety"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wloop-analysis], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wrange-loop-analysis"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wredundant-decls], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wredundant-decls"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wunused-member-function], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wunused-member-function"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wdate-time], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wdate-time"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wconditional-uninitialized], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wconditional-uninitialized"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wduplicated-branches], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wduplicated-branches"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wduplicated-cond], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wduplicated-cond"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wlogical-op], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wlogical-op"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Woverloaded-virtual], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Woverloaded-virtual"], [], [$CXXFLAG_WERROR])
  dnl -Wsuggest-override is broken with GCC before 9.2
  dnl https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78010
  AX_CHECK_COMPILE_FLAG([-Wsuggest-override], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wsuggest-override"], [], [$CXXFLAG_WERROR],
                        [AC_LANG_SOURCE([[struct A { virtual void f(); }; struct B : A { void f() final; };]])])
  AX_CHECK_COMPILE_FLAG([-Wunreachable-code-loop-increment], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wunreachable-code-loop-increment"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wimplicit-fallthrough"], [], [$CXXFLAG_WERROR])

  if test "$suppress_external_warnings" != "no" ; then
    AX_CHECK_COMPILE_FLAG([-Wdocumentation], [WARN_CXXFLAGS="$WARN_CXXFLAGS -Wdocumentation"], [], [$CXXFLAG_WERROR])
  fi

  dnl Some compilers (gcc) ignore unknown -Wno-* options, but warn about all
  dnl unknown options if any other warning is produced. Test the -Wfoo case, and
  dnl set the -Wno-foo case if it works.
  AX_CHECK_COMPILE_FLAG([-Wunused-parameter], [NOWARN_CXXFLAGS="$NOWARN_CXXFLAGS -Wno-unused-parameter"], [], [$CXXFLAG_WERROR])
  AX_CHECK_COMPILE_FLAG([-Wself-assign], [NOWARN_CXXFLAGS="$NOWARN_CXXFLAGS -Wno-self-assign"], [], [$CXXFLAG_WERROR])
  if test "$suppress_external_warnings" != "yes" ; then
    AX_CHECK_COMPILE_FLAG([-Wdeprecated-copy], [NOWARN_CXXFLAGS="$NOWARN_CXXFLAGS -Wno-deprecated-copy"], [], [$CXXFLAG_WERROR])
  fi
fi

dnl Don't allow extended (non-ASCII) symbols in identifiers. This is easier for code review.
AX_CHECK_COMPILE_FLAG([-fno-extended-identifiers], [CXXFLAGS="$CXXFLAGS -fno-extended-identifiers"], [], [$CXXFLAG_WERROR])

enable_sse42=no
enable_sse41=no
enable_avx2=no
enable_x86_shani=no

if test "$use_asm" = "yes"; then

dnl Check for optional instruction set support. Enabling these does _not_ imply that all code will
dnl be compiled with them, rather that specific objects/libs may use them after checking for runtime
dnl compatibility.

dnl x86
AX_CHECK_COMPILE_FLAG([-msse4.2], [SSE42_CXXFLAGS="-msse4.2"], [], [$CXXFLAG_WERROR])
AX_CHECK_COMPILE_FLAG([-msse4.1], [SSE41_CXXFLAGS="-msse4.1"], [], [$CXXFLAG_WERROR])
AX_CHECK_COMPILE_FLAG([-mavx -mavx2], [AVX2_CXXFLAGS="-mavx -mavx2"], [], [$CXXFLAG_WERROR])
AX_CHECK_COMPILE_FLAG([-msse4 -msha], [X86_SHANI_CXXFLAGS="-msse4 -msha"], [], [$CXXFLAG_WERROR])

enable_clmul=
AX_CHECK_COMPILE_FLAG([-mpclmul], [enable_clmul=yes], [], [$CXXFLAG_WERROR], [AC_LANG_PROGRAM([
  #include <stdint.h>
  #include <x86intrin.h>
], [
  __m128i a = _mm_cvtsi64_si128((uint64_t)7);
  __m128i b = _mm_clmulepi64_si128(a, a, 37);
  __m128i c = _mm_srli_epi64(b, 41);
  __m128i d = _mm_xor_si128(b, c);
  uint64_t e = _mm_cvtsi128_si64(d);
  return e == 0;
])])

if test "$enable_clmul" = "yes"; then
  CLMUL_CXXFLAGS="-mpclmul"
  AC_DEFINE([HAVE_CLMUL], [1], [Define this symbol if clmul instructions can be used])
fi

TEMP_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $SSE42_CXXFLAGS"
AC_MSG_CHECKING([for SSE4.2 intrinsics])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
    #include <stdint.h>
    #if defined(_MSC_VER)
    #include <intrin.h>
    #elif defined(__GNUC__) && defined(__SSE4_2__)
    #include <nmmintrin.h>
    #endif
  ]],[[
    uint64_t l = 0;
    l = _mm_crc32_u8(l, 0);
    l = _mm_crc32_u32(l, 0);
    l = _mm_crc32_u64(l, 0);
    return l;
  ]])],
 [ AC_MSG_RESULT([yes]); enable_sse42=yes],
 [ AC_MSG_RESULT([no])]
)
CXXFLAGS="$TEMP_CXXFLAGS"

TEMP_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $SSE41_CXXFLAGS"
AC_MSG_CHECKING([for SSE4.1 intrinsics])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
    #include <stdint.h>
    #include <immintrin.h>
  ]],[[
    __m128i l = _mm_set1_epi32(0);
    return _mm_extract_epi32(l, 3);
  ]])],
 [ AC_MSG_RESULT([yes]); enable_sse41=yes; AC_DEFINE([ENABLE_SSE41], [1], [Define this symbol to build code that uses SSE4.1 intrinsics]) ],
 [ AC_MSG_RESULT([no])]
)
CXXFLAGS="$TEMP_CXXFLAGS"

TEMP_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $AVX2_CXXFLAGS"
AC_MSG_CHECKING([for AVX2 intrinsics])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
    #include <stdint.h>
    #include <immintrin.h>
  ]],[[
    __m256i l = _mm256_set1_epi32(0);
    return _mm256_extract_epi32(l, 7);
  ]])],
 [ AC_MSG_RESULT([yes]); enable_avx2=yes; AC_DEFINE([ENABLE_AVX2], [1], [Define this symbol to build code that uses AVX2 intrinsics]) ],
 [ AC_MSG_RESULT([no])]
)
CXXFLAGS="$TEMP_CXXFLAGS"

TEMP_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $X86_SHANI_CXXFLAGS"
AC_MSG_CHECKING([for x86 SHA-NI intrinsics])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
    #include <stdint.h>
    #include <immintrin.h>
  ]],[[
    __m128i i = _mm_set1_epi32(0);
    __m128i j = _mm_set1_epi32(1);
    __m128i k = _mm_set1_epi32(2);
    return _mm_extract_epi32(_mm_sha256rnds2_epu32(i, i, k), 0);
  ]])],
 [ AC_MSG_RESULT([yes]); enable_x86_shani=yes; AC_DEFINE([ENABLE_X86_SHANI], [1], [Define this symbol to build code that uses x86 SHA-NI intrinsics]) ],
 [ AC_MSG_RESULT([no])]
)
CXXFLAGS="$TEMP_CXXFLAGS"

# ARM
AX_CHECK_COMPILE_FLAG([-march=armv8-a+crc+crypto], [ARM_CRC_CXXFLAGS="-march=armv8-a+crc+crypto"], [], [$CXXFLAG_WERROR])
AX_CHECK_COMPILE_FLAG([-march=armv8-a+crc+crypto], [ARM_SHANI_CXXFLAGS="-march=armv8-a+crc+crypto"], [], [$CXXFLAG_WERROR])

TEMP_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $ARM_CRC_CXXFLAGS"
AC_MSG_CHECKING([for ARMv8 CRC32 intrinsics])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
    #include <arm_acle.h>
    #include <arm_neon.h>
  ]],[[
#ifdef __aarch64__
    __crc32cb(0, 0); __crc32ch(0, 0); __crc32cw(0, 0); __crc32cd(0, 0);
    vmull_p64(0, 0);
#else
#error "crc32c library does not support hardware acceleration on 32-bit ARM"
#endif
  ]])],
 [ AC_MSG_RESULT([yes]); enable_arm_crc=yes; ],
 [ AC_MSG_RESULT([no])]
)
CXXFLAGS="$TEMP_CXXFLAGS"

TEMP_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $ARM_SHANI_CXXFLAGS"
AC_MSG_CHECKING([for ARMv8 SHA-NI intrinsics])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
    #include <arm_acle.h>
    #include <arm_neon.h>
  ]],[[
    uint32x4_t a, b, c;
    vsha256h2q_u32(a, b, c);
    vsha256hq_u32(a, b, c);
    vsha256su0q_u32(a, b);
    vsha256su1q_u32(a, b, c);
  ]])],
 [ AC_MSG_RESULT([yes]); enable_arm_shani=yes; AC_DEFINE([ENABLE_ARM_SHANI], [1], [Define this symbol to build code that uses ARMv8 SHA-NI intrinsics]) ],
 [ AC_MSG_RESULT([no])]
)
CXXFLAGS="$TEMP_CXXFLAGS"

fi

CPPFLAGS="$CPPFLAGS -DHAVE_BUILD_INFO"

AC_ARG_WITH([utils],
  [AS_HELP_STRING([--with-utils],
  [build bitcoin-cli bitcoin-tx bitcoin-util bitcoin-wallet (default=yes)])],
  [build_bitcoin_utils=$withval],
  [build_bitcoin_utils=yes])

AC_ARG_ENABLE([util-cli],
  [AS_HELP_STRING([--enable-util-cli],
  [build bitcoin-cli])],
  [build_bitcoin_cli=$enableval],
  [build_bitcoin_cli=$build_bitcoin_utils])

AC_ARG_ENABLE([util-tx],
  [AS_HELP_STRING([--enable-util-tx],
  [build bitcoin-tx])],
  [build_bitcoin_tx=$enableval],
  [build_bitcoin_tx=$build_bitcoin_utils])

AC_ARG_ENABLE([util-wallet],
  [AS_HELP_STRING([--enable-util-wallet],
  [build bitcoin-wallet])],
  [build_bitcoin_wallet=$enableval],
  [build_bitcoin_wallet=$build_bitcoin_utils])

AC_ARG_ENABLE([util-util],
  [AS_HELP_STRING([--enable-util-util],
  [build bitcoin-util])],
  [build_bitcoin_util=$enableval],
  [build_bitcoin_util=$build_bitcoin_utils])

AC_ARG_WITH([libs],
  [AS_HELP_STRING([--with-libs],
  [build libraries (default=yes)])],
  [build_bitcoin_libs=$withval],
  [build_bitcoin_libs=yes])

AC_ARG_WITH([daemon],
  [AS_HELP_STRING([--with-daemon],
  [build bitcoind daemon (default=yes)])],
  [build_bitcoind=$withval],
  [build_bitcoind=yes])

case $host in
  *mingw*)
     TARGET_OS=windows
     AC_CHECK_LIB([kernel32], [GetModuleFileNameA],      [], [AC_MSG_ERROR([libkernel32 missing])])
     AC_CHECK_LIB([user32],   [main],                    [], [AC_MSG_ERROR([libuser32 missing])])
     AC_CHECK_LIB([gdi32],    [main],                    [], [AC_MSG_ERROR([libgdi32 missing])])
     AC_CHECK_LIB([comdlg32], [main],                    [], [AC_MSG_ERROR([libcomdlg32 missing])])
     AC_CHECK_LIB([winmm],    [main],                    [], [AC_MSG_ERROR([libwinmm missing])])
     AC_CHECK_LIB([shell32],  [SHGetSpecialFolderPathW], [], [AC_MSG_ERROR([libshell32 missing])])
     AC_CHECK_LIB([comctl32], [main],                    [], [AC_MSG_ERROR([libcomctl32 missing])])
     AC_CHECK_LIB([ole32],    [CoCreateInstance],        [], [AC_MSG_ERROR([libole32 missing])])
     AC_CHECK_LIB([oleaut32], [main],                    [], [AC_MSG_ERROR([liboleaut32 missing])])
     AC_CHECK_LIB([uuid],     [main],                    [], [AC_MSG_ERROR([libuuid missing])])
     AC_CHECK_LIB([advapi32], [CryptAcquireContextW],    [], [AC_MSG_ERROR([libadvapi32 missing])])
     AC_CHECK_LIB([ws2_32],   [WSAStartup],              [], [AC_MSG_ERROR([libws2_32 missing])])
     AC_CHECK_LIB([shlwapi],  [PathRemoveFileSpecW],     [], [AC_MSG_ERROR([libshlwapi missing])])
     AC_CHECK_LIB([iphlpapi], [GetAdaptersAddresses],    [], [AC_MSG_ERROR([libiphlpapi missing])])

     dnl -static is interpreted by libtool, where it has a different meaning.
     dnl In libtool-speak, it's -all-static.
     AX_CHECK_LINK_FLAG([-static], [LIBTOOL_APP_LDFLAGS="$LIBTOOL_APP_LDFLAGS -all-static"])

     AC_PATH_PROG([MAKENSIS], [makensis], [none])
     if test "$MAKENSIS" = "none"; then
       AC_MSG_WARN([makensis not found. Cannot create installer.])
     fi

     AC_PATH_TOOL([WINDRES], [windres], [none])
     if test "$WINDRES" = "none"; then
       AC_MSG_ERROR([windres not found])
     fi

     CPPFLAGS="$CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -D_WIN32_WINNT=0x0601 -D_WIN32_IE=0x0501 -DWIN32_LEAN_AND_MEAN"

     dnl libtool insists upon adding -nostdlib and a list of objects/libs to link against.
     dnl That breaks our ability to build dll's with static libgcc/libstdc++/libssp. Override
     dnl its command here, with the predeps/postdeps removed, and -static inserted. Postdeps are
     dnl also overridden to prevent their insertion later.
     dnl This should only affect dll's.
     archive_cmds_CXX="\$CC -shared \$libobjs \$deplibs \$compiler_flags -static -o \$output_objdir/\$soname \${wl}--enable-auto-image-base -Xlinker --out-implib -Xlinker \$lib"
     postdeps_CXX=

     dnl We require Windows 7 (NT 6.1) or later
     AX_CHECK_LINK_FLAG([-Wl,--major-subsystem-version -Wl,6 -Wl,--minor-subsystem-version -Wl,1], [LDFLAGS="$LDFLAGS -Wl,--major-subsystem-version -Wl,6 -Wl,--minor-subsystem-version -Wl,1"], [], [$LDFLAG_WERROR])
     ;;
  *darwin*)
     TARGET_OS=darwin
     if  test $cross_compiling != "yes"; then
       BUILD_OS=darwin
       AC_CHECK_PROG([BREW], [brew], [brew])
       if test "$BREW" = "brew"; then
         dnl These Homebrew packages may be keg-only, meaning that they won't be found
         dnl in expected paths because they may conflict with system files. Ask
         dnl Homebrew where each one is located, then adjust paths accordingly.
         dnl It's safe to add these paths even if the functionality is disabled by
         dnl the user (--without-wallet or --without-gui for example).

         if test "$use_bdb" != "no" && $BREW list --versions berkeley-db@4 >/dev/null && test "$BDB_CFLAGS" = "" && test "$BDB_LIBS" = ""; then
           bdb_prefix=$($BREW --prefix berkeley-db@4 2>/dev/null)
           dnl This must precede the call to BITCOIN_FIND_BDB48 below.
           BDB_CFLAGS="-I$bdb_prefix/include"
           BDB_LIBS="-L$bdb_prefix/lib -ldb_cxx-4.8"
         fi

         if $BREW list --versions qt@5 >/dev/null; then
           export PKG_CONFIG_PATH="$($BREW --prefix qt@5 2>/dev/null)/lib/pkgconfig:$PKG_CONFIG_PATH"
         fi

         case $host in
           *aarch64*)
             dnl The preferred Homebrew prefix for Apple Silicon is /opt/homebrew.
             dnl Therefore, as we do not use pkg-config to detect miniupnpc and libnatpmp
             dnl packages, we should set the CPPFLAGS and LDFLAGS variables for them
             dnl explicitly.
             if test "$use_upnp" != "no" && $BREW list --versions miniupnpc >/dev/null; then
               miniupnpc_prefix=$($BREW --prefix miniupnpc 2>/dev/null)
               if test "$suppress_external_warnings" != "no"; then
                 CPPFLAGS="$CPPFLAGS -isystem $miniupnpc_prefix/include"
               else
                 CPPFLAGS="$CPPFLAGS -I$miniupnpc_prefix/include"
               fi
               LDFLAGS="$LDFLAGS -L$miniupnpc_prefix/lib"
             fi
             if test "$use_natpmp" != "no" && $BREW list --versions libnatpmp >/dev/null; then
               libnatpmp_prefix=$($BREW --prefix libnatpmp 2>/dev/null)
               if test "$suppress_external_warnings" != "no"; then
                 CPPFLAGS="$CPPFLAGS -isystem $libnatpmp_prefix/include"
               else
                 CPPFLAGS="$CPPFLAGS -I$libnatpmp_prefix/include"
               fi
               LDFLAGS="$LDFLAGS -L$libnatpmp_prefix/lib"
             fi
             ;;
         esac
       fi
     else
       case $build_os in
         *darwin*)
           BUILD_OS=darwin
           ;;
         *)
           AC_PATH_TOOL([DSYMUTIL], [dsymutil], [dsymutil])
           AC_PATH_TOOL([INSTALLNAMETOOL], [install_name_tool], [install_name_tool])
           AC_PATH_TOOL([OTOOL], [otool], [otool])
           AC_PATH_PROGS([XORRISOFS], [xorrisofs], [xorrisofs])
           AC_PATH_PROGS([DMG], [dmg], [dmg])

           dnl libtool will try to strip the static lib, which is a problem for
           dnl cross-builds because strip attempts to call a hard-coded ld,
           dnl which may not exist in the path. Stripping the .a is not
           dnl necessary, so just disable it.
           old_striplib=
           ;;
       esac
     fi

     AX_CHECK_LINK_FLAG([-Wl,-headerpad_max_install_names], [LDFLAGS="$LDFLAGS -Wl,-headerpad_max_install_names"], [], [$LDFLAG_WERROR])
     CPPFLAGS="$CPPFLAGS -DMAC_OSX -DOBJC_OLD_DISPATCH_PROTOTYPES=0"
     OBJCXXFLAGS="$CXXFLAGS"
     ;;
   *android*)
     dnl make sure android stays above linux for hosts like *linux-android*
     TARGET_OS=android
     case $host in
       *x86_64*)
          ANDROID_ARCH=x86_64
          ;;
        *aarch64*)
          ANDROID_ARCH=arm64-v8a
          ;;
        *armv7a*)
          ANDROID_ARCH=armeabi-v7a
          ;;
        *) AC_MSG_ERROR([Could not determine Android arch, or it is unsupported]) ;;
      esac
     ;;
   *linux*)
     TARGET_OS=linux
     ;;
esac

if test "$use_extended_functional_tests" != "no"; then
  AC_SUBST(EXTENDED_FUNCTIONAL_TESTS, --extended)
fi

if test "$use_lcov" = "yes"; then
  if test "$LCOV" = ""; then
    AC_MSG_ERROR([lcov testing requested but lcov not found])
  fi
  if test "$PYTHON" = ""; then
    AC_MSG_ERROR([lcov testing requested but python not found])
  fi
  if test "$GENHTML" = ""; then
    AC_MSG_ERROR([lcov testing requested but genhtml not found])
  fi

  AC_MSG_CHECKING([whether compiler is Clang])
  AC_PREPROC_IFELSE([AC_LANG_SOURCE([[
      #if defined(__clang__) && defined(__llvm__)
      // Compiler is Clang
      #else
      #  error Compiler is not Clang
      #endif
    ]])],[
      AC_MSG_RESULT([yes])
      if test "$LLVM_COV" = ""; then
        AC_MSG_ERROR([lcov testing requested but llvm-cov not found])
      fi
      COV_TOOL="$LLVM_COV gcov"
    ],[
      AC_MSG_RESULT([no])
      if test "$GCOV" = "x"; then
        AC_MSG_ERROR([lcov testing requested but gcov not found])
      fi
      COV_TOOL="$GCOV"
  ])
  AC_SUBST(COV_TOOL)
  AC_SUBST(COV_TOOL_WRAPPER, "cov_tool_wrapper.sh")
  LCOV="$LCOV --gcov-tool $(pwd)/$COV_TOOL_WRAPPER"

  AX_CHECK_LINK_FLAG([--coverage], [LDFLAGS="$LDFLAGS --coverage"],
    [AC_MSG_ERROR([lcov testing requested but --coverage linker flag does not work])])
  AX_CHECK_COMPILE_FLAG([--coverage],[CXXFLAGS="$CXXFLAGS --coverage"],
    [AC_MSG_ERROR([lcov testing requested but --coverage flag does not work])])
  CXXFLAGS="$CXXFLAGS -Og"
fi

if test "$use_lcov_branch" != "no"; then
  AC_SUBST(LCOV_OPTS, "$LCOV_OPTS --rc lcov_branch_coverage=1")
fi

dnl Check for endianness
AC_C_BIGENDIAN

dnl Check for pthread compile/link requirements
AX_PTHREAD

dnl The following macro will add the necessary defines to bitcoin-config.h, but
dnl they also need to be passed down to any subprojects. Pull the results out of
dnl the cache and add them to CPPFLAGS.
AC_SYS_LARGEFILE
dnl detect POSIX or GNU variant of strerror_r
AC_FUNC_STRERROR_R

if test "$ac_cv_sys_file_offset_bits" != "" &&
   test "$ac_cv_sys_file_offset_bits" != "no" &&
   test "$ac_cv_sys_file_offset_bits" != "unknown"; then
  CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits"
fi

if test "$ac_cv_sys_large_files" != "" &&
   test "$ac_cv_sys_large_files" != "no" &&
   test "$ac_cv_sys_large_files" != "unknown"; then
  CPPFLAGS="$CPPFLAGS -D_LARGE_FILES=$ac_cv_sys_large_files"
fi

AC_SEARCH_LIBS([clock_gettime],[rt])

if test "$enable_gprof" = "yes"; then
    dnl -pg is incompatible with -pie. Since hardening and profiling together doesn't make sense,
    dnl we simply make them mutually exclusive here. Additionally, hardened toolchains may force
    dnl -pie by default, in which case it needs to be turned off with -no-pie.

    if test "$use_hardening" = "yes"; then
        AC_MSG_ERROR([gprof profiling is not compatible with hardening. Reconfigure with --disable-hardening or --disable-gprof])
    fi
    use_hardening=no
    AX_CHECK_COMPILE_FLAG([-pg],[GPROF_CXXFLAGS="-pg"],
        [AC_MSG_ERROR([gprof profiling requested but not available])], [$CXXFLAG_WERROR])

    AX_CHECK_LINK_FLAG([-no-pie], [GPROF_LDFLAGS="-no-pie"])
    AX_CHECK_LINK_FLAG([-pg], [GPROF_LDFLAGS="$GPROF_LDFLAGS -pg"],
        [AC_MSG_ERROR([gprof profiling requested but not available])], [$GPROF_LDFLAGS])
fi

if test "$TARGET_OS" != "windows"; then
  dnl All windows code is PIC, forcing it on just adds useless compile warnings
  AX_CHECK_COMPILE_FLAG([-fPIC], [PIC_FLAGS="-fPIC"])
fi

dnl All versions of gcc that we commonly use for building are subject to bug
dnl https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90348. To work around that, set
dnl -fstack-reuse=none for all gcc builds. (Only gcc understands this flag)
AX_CHECK_COMPILE_FLAG([-fstack-reuse=none], [HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -fstack-reuse=none"])
if test "$use_hardening" != "no"; then
  use_hardening=yes
  AX_CHECK_COMPILE_FLAG([-Wstack-protector], [HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -Wstack-protector"])
  AX_CHECK_COMPILE_FLAG([-fstack-protector-all], [HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -fstack-protector-all"])

  dnl -fcf-protection used with Clang 7 causes ld to emit warnings:
  dnl ld: error: ... <corrupt x86 feature size: 0x8>
  dnl Use CHECK_LINK_FLAG & --fatal-warnings to ensure we won't use the flag in this case.
  AX_CHECK_LINK_FLAG([-fcf-protection=full], [HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -fcf-protection=full"], [], [$LDFLAG_WERROR])

  case $host in
    *mingw*)
      dnl stack-clash-protection doesn't currently work, and likely should just be skipped for Windows.
      dnl See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90458 for more details.
      ;;
    *)
      AX_CHECK_COMPILE_FLAG([-fstack-clash-protection], [HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -fstack-clash-protection"], [], [$CXXFLAG_WERROR])
      ;;
  esac


  dnl When enable_debug is yes, all optimizations are disabled.
  dnl However, FORTIFY_SOURCE requires that there is some level of optimization, otherwise it does nothing and just creates a compiler warning.
  dnl Since FORTIFY_SOURCE is a no-op without optimizations, do not enable it when enable_debug is yes.
  if test "$enable_debug" != "yes"; then
    AX_CHECK_PREPROC_FLAG([-D_FORTIFY_SOURCE=2],[
      AX_CHECK_PREPROC_FLAG([-U_FORTIFY_SOURCE],[
        HARDENED_CPPFLAGS="$HARDENED_CPPFLAGS -U_FORTIFY_SOURCE"
      ])
      HARDENED_CPPFLAGS="$HARDENED_CPPFLAGS -D_FORTIFY_SOURCE=2"
    ])
  fi

  AX_CHECK_LINK_FLAG([-Wl,--enable-reloc-section], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--enable-reloc-section"], [], [$LDFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-Wl,--dynamicbase], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--dynamicbase"], [], [$LDFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-Wl,--nxcompat], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--nxcompat"], [], [$LDFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-Wl,--high-entropy-va], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--high-entropy-va"], [], [$LDFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-Wl,-z,relro], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-z,relro"], [], [$LDFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-Wl,-z,now], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-z,now"], [], [$LDFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-Wl,-z,separate-code], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-z,separate-code"], [], [$LDFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-fPIE -pie], [PIE_FLAGS="-fPIE"; HARDENED_LDFLAGS="$HARDENED_LDFLAGS -pie"], [], [$CXXFLAG_WERROR])

  case $host in
    *mingw*)
       AC_CHECK_LIB([ssp], [main], [], [AC_MSG_ERROR([libssp missing])])
    ;;
  esac
fi

dnl These flags are specific to ld64, and may cause issues with other linkers.
dnl For example: GNU ld will interpret -dead_strip as -de and then try and use
dnl "ad_strip" as the symbol for the entry point.
if test "$TARGET_OS" = "darwin"; then
  AX_CHECK_LINK_FLAG([-Wl,-dead_strip], [LDFLAGS="$LDFLAGS -Wl,-dead_strip"], [], [$LDFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-Wl,-dead_strip_dylibs], [LDFLAGS="$LDFLAGS -Wl,-dead_strip_dylibs"], [], [$LDFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-Wl,-bind_at_load], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-bind_at_load"], [], [$LDFLAG_WERROR])
fi

AC_CHECK_HEADERS([endian.h sys/endian.h byteswap.h stdio.h stdlib.h unistd.h strings.h sys/types.h sys/stat.h sys/select.h sys/prctl.h sys/sysctl.h vm/vm_param.h sys/vmmeter.h sys/resources.h])

AC_CHECK_DECLS([getifaddrs, freeifaddrs],[CHECK_SOCKET],,
    [#include <sys/types.h>
    #include <ifaddrs.h>]
)
AC_CHECK_DECLS([strnlen])

dnl These are used for daemonization in bitcoind
AC_CHECK_DECLS([fork])
AC_CHECK_DECLS([setsid])

AC_CHECK_DECLS([pipe2])

AC_CHECK_DECLS([le16toh, le32toh, le64toh, htole16, htole32, htole64, be16toh, be32toh, be64toh, htobe16, htobe32, htobe64],,,
    [#if HAVE_ENDIAN_H
                 #include <endian.h>
                 #elif HAVE_SYS_ENDIAN_H
                 #include <sys/endian.h>
                 #endif])

AC_CHECK_DECLS([bswap_16, bswap_32, bswap_64],,,
    [#if HAVE_BYTESWAP_H
                 #include <byteswap.h>
                 #endif])

AC_MSG_CHECKING([for __builtin_clzl])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[
 (void) __builtin_clzl(0);
  ]])],
 [ AC_MSG_RESULT([yes]); have_clzl=yes; AC_DEFINE([HAVE_BUILTIN_CLZL], [1], [Define this symbol if you have __builtin_clzl])],
 [ AC_MSG_RESULT([no]); have_clzl=no;]
)

AC_MSG_CHECKING([for __builtin_clzll])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[
  (void) __builtin_clzll(0);
  ]])],
 [ AC_MSG_RESULT([yes]); have_clzll=yes; AC_DEFINE([HAVE_BUILTIN_CLZLL], [1], [Define this symbol if you have __builtin_clzll])],
 [ AC_MSG_RESULT([no]); have_clzll=no;]
)

dnl Check for malloc_info (for memory statistics information in getmemoryinfo)
AC_MSG_CHECKING([for getmemoryinfo])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <malloc.h>]],
 [[ int f = malloc_info(0, NULL); ]])],
 [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_MALLOC_INFO], [1], [Define this symbol if you have malloc_info]) ],
 [ AC_MSG_RESULT([no])]
)

dnl Check for mallopt(M_ARENA_MAX) (to set glibc arenas)
AC_MSG_CHECKING([for mallopt M_ARENA_MAX])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <malloc.h>]],
 [[ mallopt(M_ARENA_MAX, 1); ]])],
 [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_MALLOPT_ARENA_MAX], [1], [Define this symbol if you have mallopt with M_ARENA_MAX]) ],
 [ AC_MSG_RESULT([no])]
)

dnl Check for posix_fallocate
AC_MSG_CHECKING([for posix_fallocate])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
                   // same as in src/util/system.cpp
                   #ifdef __linux__
                   #ifdef _POSIX_C_SOURCE
                   #undef _POSIX_C_SOURCE
                   #endif
                   #define _POSIX_C_SOURCE 200112L
                   #endif // __linux__
                   #include <fcntl.h>]],
                   [[ int f = posix_fallocate(0, 0, 0); ]])],
 [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_POSIX_FALLOCATE], [1], [Define this symbol if you have posix_fallocate]) ],
 [ AC_MSG_RESULT([no])]
)

AC_MSG_CHECKING([for default visibility attribute])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
  int foo(void) __attribute__((visibility("default")));
  int main(){}
  ])],
  [
    AC_DEFINE([HAVE_DEFAULT_VISIBILITY_ATTRIBUTE], [1], [Define if the visibility attribute is supported.])
    AC_MSG_RESULT([yes])
  ],
  [
    AC_MSG_RESULT([no])
    if test "$use_reduce_exports" = "yes"; then
      AC_MSG_ERROR([Cannot find a working visibility attribute. Use --disable-reduce-exports.])
    fi
  ]
)

AC_MSG_CHECKING([for dllexport attribute])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
  __declspec(dllexport) int foo(void);
  int main(){}
  ])],
  [
    AC_DEFINE([HAVE_DLLEXPORT_ATTRIBUTE], [1], [Define if the dllexport attribute is supported.])
    AC_MSG_RESULT([yes])
  ],
  [AC_MSG_RESULT([no])]
)

if test "$use_thread_local" = "yes" || test "$use_thread_local" = "auto"; then
  TEMP_LDFLAGS="$LDFLAGS"
  LDFLAGS="$TEMP_LDFLAGS $PTHREAD_CFLAGS"
  AC_MSG_CHECKING([for thread_local support])
  AC_LINK_IFELSE([AC_LANG_SOURCE([
    #include <thread>
    static thread_local int foo = 0;
    static void run_thread() { foo++;}
    int main(){
    for(int i = 0; i < 10; i++) { std::thread(run_thread).detach();}
    return foo;
    }
    ])],
    [
     case $host in
       *mingw*)
          dnl mingw32's implementation of thread_local has also been shown to behave
          dnl erroneously under concurrent usage; see:
          dnl https://gist.github.com/jamesob/fe9a872051a88b2025b1aa37bfa98605
          AC_MSG_RESULT([no])
          ;;
        *freebsd*)
          dnl FreeBSD's implementation of thread_local is also buggy (per
          dnl https://groups.google.com/d/msg/bsdmailinglist/22ncTZAbDp4/Dii_pII5AwAJ)
          AC_MSG_RESULT([no])
          ;;
        *)
          AC_DEFINE([HAVE_THREAD_LOCAL], [1], [Define if thread_local is supported.])
          AC_MSG_RESULT([yes])
          ;;
      esac
    ],
    [
      AC_MSG_RESULT([no])
    ]
  )
  LDFLAGS="$TEMP_LDFLAGS"
fi

dnl check for gmtime_r(), fallback to gmtime_s() if that is unavailable
dnl fail if neither are available.
AC_MSG_CHECKING([for gmtime_r])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <ctime>]],
  [[ gmtime_r((const time_t *) nullptr, (struct tm *) nullptr); ]])],
  [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_GMTIME_R], [1], [Define this symbol if gmtime_r is available]) ],
  [ AC_MSG_RESULT([no]);
    AC_MSG_CHECKING([for gmtime_s]);
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <ctime>]],
       [[ gmtime_s((struct tm *) nullptr, (const time_t *) nullptr); ]])],
       [ AC_MSG_RESULT([yes])],
       [ AC_MSG_RESULT([no]); AC_MSG_ERROR([Both gmtime_r and gmtime_s are unavailable]) ]
    )
  ]
)

dnl Check for different ways of gathering OS randomness
AC_MSG_CHECKING([for Linux getrandom syscall])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>
  #include <sys/syscall.h>
  #include <linux/random.h>]],
 [[ syscall(SYS_getrandom, nullptr, 32, 0); ]])],
 [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_SYS_GETRANDOM], [1], [Define this symbol if the Linux getrandom system call is available]) ],
 [ AC_MSG_RESULT([no])]
)

AC_MSG_CHECKING([for getentropy via random.h])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>
 #include <sys/random.h>]],
 [[ getentropy(nullptr, 32) ]])],
 [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_GETENTROPY_RAND], [1], [Define this symbol if the BSD getentropy system call is available with sys/random.h]) ],
 [ AC_MSG_RESULT([no])]
)

AC_MSG_CHECKING([for sysctl])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
  #include <sys/sysctl.h>]],
 [[ #ifdef __linux__
    #error "Don't use sysctl on Linux, it's deprecated even when it works"
    #endif
    sysctl(nullptr, 2, nullptr, nullptr, nullptr, 0); ]])],
 [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_SYSCTL], [1], [Define this symbol if the BSD sysctl() is available]) ],
 [ AC_MSG_RESULT([no])]
)

AC_MSG_CHECKING([for sysctl KERN_ARND])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
  #include <sys/sysctl.h>]],
 [[ #ifdef __linux__
    #error "Don't use sysctl on Linux, it's deprecated even when it works"
    #endif
    static int name[2] = {CTL_KERN, KERN_ARND};
    sysctl(name, 2, nullptr, nullptr, nullptr, 0); ]])],
 [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_SYSCTL_ARND], [1], [Define this symbol if the BSD sysctl(KERN_ARND) is available]) ],
 [ AC_MSG_RESULT([no])]
)

AC_MSG_CHECKING([for if type char equals int8_t])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdint.h>
  #include <type_traits>]],
 [[ static_assert(std::is_same<int8_t, char>::value, ""); ]])],
 [ AC_MSG_RESULT([yes]); AC_DEFINE([CHAR_EQUALS_INT8], [1], [Define this symbol if type char equals int8_t]) ],
 [ AC_MSG_RESULT([no])]
)

AC_MSG_CHECKING([for fdatasync])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>]],
 [[ fdatasync(0); ]])],
 [ AC_MSG_RESULT([yes]); HAVE_FDATASYNC=1 ],
 [ AC_MSG_RESULT([no]); HAVE_FDATASYNC=0 ]
)
AC_DEFINE_UNQUOTED([HAVE_FDATASYNC], [$HAVE_FDATASYNC], [Define to 1 if fdatasync is available.])

AC_MSG_CHECKING([for F_FULLFSYNC])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <fcntl.h>]],
 [[ fcntl(0, F_FULLFSYNC, 0); ]])],
 [ AC_MSG_RESULT([yes]); HAVE_FULLFSYNC=1 ],
 [ AC_MSG_RESULT([no]); HAVE_FULLFSYNC=0 ]
)

AC_MSG_CHECKING([for O_CLOEXEC])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <fcntl.h>]],
 [[ open("", O_CLOEXEC); ]])],
 [ AC_MSG_RESULT([yes]); HAVE_O_CLOEXEC=1 ],
 [ AC_MSG_RESULT([no]); HAVE_O_CLOEXEC=0 ]
)
AC_DEFINE_UNQUOTED([HAVE_O_CLOEXEC], [$HAVE_O_CLOEXEC], [Define to 1 if O_CLOEXEC flag is available.])

dnl crc32c platform checks
AC_MSG_CHECKING([for __builtin_prefetch])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[
  char data = 0;
  const char* address = &data;
  __builtin_prefetch(address, 0, 0);
  ]])],
 [ AC_MSG_RESULT([yes]); HAVE_BUILTIN_PREFETCH=1 ],
 [ AC_MSG_RESULT([no]); HAVE_BUILTIN_PREFETCH=0 ]
)

AC_MSG_CHECKING([for _mm_prefetch])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <xmmintrin.h>]], [[
  char data = 0;
  const char* address = &data;
  _mm_prefetch(address, _MM_HINT_NTA);
  ]])],
 [ AC_MSG_RESULT([yes]); HAVE_MM_PREFETCH=1 ],
 [ AC_MSG_RESULT([no]); HAVE_MM_PREFETCH=0 ]
)

AC_MSG_CHECKING([for strong getauxval support in the system headers])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
    #include <sys/auxv.h>
  ]], [[
    getauxval(AT_HWCAP);
  ]])],
 [ AC_MSG_RESULT([yes]); HAVE_STRONG_GETAUXVAL=1; AC_DEFINE([HAVE_STRONG_GETAUXVAL], [1], [Define this symbol to build code that uses getauxval)]) ],
 [ AC_MSG_RESULT([no]); HAVE_STRONG_GETAUXVAL=0 ]
)

have_any_system=no
AC_MSG_CHECKING([for std::system])
AC_LINK_IFELSE(
    [ AC_LANG_PROGRAM(
        [[ #include <cstdlib> ]],
        [[ int nErr = std::system(""); ]]
    )],
    [ AC_MSG_RESULT([yes]); have_any_system=yes],
    [ AC_MSG_RESULT([no]) ]
)

AC_MSG_CHECKING([for ::_wsystem])
AC_LINK_IFELSE(
    [ AC_LANG_PROGRAM(
        [[ ]],
        [[ int nErr = ::_wsystem(""); ]]
    )],
    [ AC_MSG_RESULT([yes]); have_any_system=yes],
    [ AC_MSG_RESULT([no]) ]
)

if test "$have_any_system" != "no"; then
  AC_DEFINE([HAVE_SYSTEM], [1], [Define to 1 if std::system or ::wsystem is available.])
fi

dnl SUPPRESSED_CPPFLAGS=SUPPRESS_WARNINGS([$SOME_CPPFLAGS])
dnl Replace -I with -isystem in $SOME_CPPFLAGS to suppress warnings from
dnl headers from its include directories and return the result.
dnl See -isystem documentation:
dnl https://gcc.gnu.org/onlinedocs/gcc/Directory-Options.html
dnl https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-isystem-directory
dnl Do not change "-I/usr/include" to "-isystem /usr/include" because that
dnl is not necessary (/usr/include is already a system directory) and because
dnl it would break GCC's #include_next.
AC_DEFUN([SUPPRESS_WARNINGS],
         [$(echo $1 |${SED} -E -e 's/(^| )-I/\1-isystem /g' -e 's;-isystem /usr/include([/ ]|$);-I/usr/include\1;g')])

dnl enable-fuzz should disable all other targets
if test "$enable_fuzz" = "yes"; then
  AC_MSG_WARN([enable-fuzz will disable all other targets and force --enable-fuzz-binary=yes])
  build_bitcoin_utils=no
  build_bitcoin_cli=no
  build_bitcoin_tx=no
  build_bitcoin_util=no
  build_bitcoin_wallet=no
  build_bitcoind=no
  build_bitcoin_libs=no
  bitcoin_enable_qt=no
  bitcoin_enable_qt_test=no
  bitcoin_enable_qt_dbus=no
  use_bench=no
  use_external_signer=no
  use_upnp=no
  use_natpmp=no
  use_zmq=no
  enable_fuzz_binary=yes

  AX_CHECK_PREPROC_FLAG([-DABORT_ON_FAILED_ASSUME], [DEBUG_CPPFLAGS="$DEBUG_CPPFLAGS -DABORT_ON_FAILED_ASSUME"], [], [$CXXFLAG_WERROR])

  AC_MSG_CHECKING([whether main function is needed for fuzz binary])
  AX_CHECK_LINK_FLAG(
    [-fsanitize=$use_sanitizers],
    [AC_MSG_RESULT([no])],
    [AC_MSG_RESULT([yes]); CPPFLAGS="$CPPFLAGS -DPROVIDE_FUZZ_MAIN_FUNCTION"],
    [],
    [AC_LANG_PROGRAM([[
      #include <cstdint>
      #include <cstddef>
      extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { return 0; }
      /* comment to remove the main function ...
     ]],[[
      */ int not_main() {
     ]])])
else
  BITCOIN_QT_INIT

  dnl sets $bitcoin_enable_qt, $bitcoin_enable_qt_test, $bitcoin_enable_qt_dbus
  BITCOIN_QT_CONFIGURE([5.9.5])

  dnl Keep a copy of the original $QT_INCLUDES and use it when invoking qt's moc
  QT_INCLUDES_UNSUPPRESSED=$QT_INCLUDES
  if test "$suppress_external_warnings" != "no" ; then
    QT_INCLUDES=SUPPRESS_WARNINGS($QT_INCLUDES)
    QT_DBUS_INCLUDES=SUPPRESS_WARNINGS($QT_DBUS_INCLUDES)
    QT_TEST_INCLUDES=SUPPRESS_WARNINGS($QT_TEST_INCLUDES)
  fi

  CPPFLAGS="$CPPFLAGS -DPROVIDE_FUZZ_MAIN_FUNCTION"
fi

if test "$enable_wallet" != "no"; then
    dnl Check for libdb_cxx only if wallet enabled
    if test "$use_bdb" != "no"; then
      BITCOIN_FIND_BDB48
      if test "$suppress_external_warnings" != "no" ; then
        BDB_CPPFLAGS=SUPPRESS_WARNINGS($BDB_CPPFLAGS)
      fi
    fi

    dnl Check for sqlite3
    if test "$use_sqlite" != "no"; then
      PKG_CHECK_MODULES([SQLITE], [sqlite3 >= 3.7.17], [have_sqlite=yes], [have_sqlite=no])
    fi
    AC_MSG_CHECKING([whether to build wallet with support for sqlite])
    if test "$use_sqlite" = "no"; then
      use_sqlite=no
    elif test "$have_sqlite" = "no"; then
      if test "$use_sqlite" = "yes"; then
        AC_MSG_ERROR([sqlite support requested but cannot be built. Use --without-sqlite])
      fi
      use_sqlite=no
    else
      if test "$use_sqlite" != "no"; then
        AC_DEFINE([USE_SQLITE],[1],[Define if sqlite support should be compiled in])
        use_sqlite=yes
      fi
    fi
    AC_MSG_RESULT([$use_sqlite])

    dnl Disable wallet if both --without-bdb and --without-sqlite
    if test "$use_bdb$use_sqlite" = "nono"; then
        if test "$enable_wallet" = "yes"; then
            AC_MSG_ERROR([wallet functionality requested but no BDB or SQLite support available.])
        fi
        enable_wallet=no
    fi
fi

if test "$use_usdt" != "no"; then
  AC_MSG_CHECKING([whether Userspace, Statically Defined Tracing tracepoints are supported])
  AC_COMPILE_IFELSE([
    AC_LANG_PROGRAM(
      [#include <sys/sdt.h>],
      [DTRACE_PROBE("context", "event");]
    )],
    [AC_MSG_RESULT([yes]); AC_DEFINE([ENABLE_TRACING], [1], [Define to 1 to enable tracepoints for Userspace, Statically Defined Tracing])],
    [AC_MSG_RESULT([no]); use_usdt=no;]
  )
fi

if test "$build_bitcoin_cli$build_bitcoin_tx$build_bitcoin_util$build_bitcoind$bitcoin_enable_qt$use_bench$use_tests" = "nonononononono"; then
  use_upnp=no
  use_natpmp=no
  use_zmq=no
fi

dnl Check for libminiupnpc (optional)
if test "$use_upnp" != "no"; then
  AC_CHECK_HEADERS(
    [miniupnpc/miniupnpc.h miniupnpc/upnpcommands.h miniupnpc/upnperrors.h],
    [AC_CHECK_LIB([miniupnpc], [upnpDiscover], [MINIUPNPC_LIBS=-lminiupnpc], [have_miniupnpc=no])],
    [have_miniupnpc=no]
  )
dnl The minimum supported miniUPnPc API version is set to 10. This keeps compatibility
dnl with Ubuntu 16.04 LTS and Debian 8 libminiupnpc-dev packages.
if test "$have_miniupnpc" != "no"; then
  AC_MSG_CHECKING([whether miniUPnPc API version is supported])
  AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[
      @%:@include <miniupnpc/miniupnpc.h>
    ]], [[
      #if MINIUPNPC_API_VERSION >= 10
      // Everything is okay
      #else
      #  error miniUPnPc API version is too old
      #endif
    ]])],[
      AC_MSG_RESULT([yes])
    ],[
    AC_MSG_RESULT([no])
    AC_MSG_WARN([miniUPnPc API version < 10 is unsupported, disabling UPnP support.])
    have_miniupnpc=no
  ])
fi
fi

dnl Check for libnatpmp (optional).
if test "$use_natpmp" != "no"; then
  AC_CHECK_HEADERS([natpmp.h],
                   [AC_CHECK_LIB([natpmp], [initnatpmp], [NATPMP_LIBS=-lnatpmp], [have_natpmp=no])],
                   [have_natpmp=no])
fi

if test "$build_bitcoin_wallet$build_bitcoin_cli$build_bitcoin_tx$build_bitcoind$bitcoin_enable_qt$use_tests$use_bench" = "nonononononono"; then
  use_boost=no
else
  use_boost=yes
fi

if test "$use_boost" = "yes"; then

  dnl Check for Boost headers
  AX_BOOST_BASE([1.64.0],[],[AC_MSG_ERROR([Boost is not available!])])
  if test "$want_boost" = "no"; then
    AC_MSG_ERROR([only libbitcoinconsensus can be built without Boost])
  fi

  if test "$suppress_external_warnings" != "no"; then
    BOOST_CPPFLAGS=SUPPRESS_WARNINGS($BOOST_CPPFLAGS)
  fi
fi

if test "$use_external_signer" != "no"; then
  case $host in
    *mingw*)
      dnl Boost Process uses Boost Filesystem when targeting Windows. Also,
      dnl since Boost 1.71.0, Process does not work with mingw-w64 without
      dnl workarounds. See 67669ab425b52a2b6be3d2f3b3b7e3939b676a2c.
      if test "$use_external_signer" = "yes"; then
        AC_MSG_ERROR([External signing is not supported on Windows])
      fi
      use_external_signer="no";
    ;;
    *)
      AC_MSG_CHECKING([whether Boost.Process can be used])
      TEMP_CXXFLAGS="$CXXFLAGS"
      dnl Boost 1.78 requires the following workaround.
      dnl See: https://github.com/boostorg/process/issues/235
      CXXFLAGS="$CXXFLAGS -Wno-error=narrowing"
      TEMP_CPPFLAGS="$CPPFLAGS"
      CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
      TEMP_LDFLAGS="$LDFLAGS"
      dnl Boost 1.73 and older require the following workaround.
      LDFLAGS="$LDFLAGS $PTHREAD_CFLAGS"
      AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <boost/process.hpp>]])],
        [have_boost_process="yes"],
        [have_boost_process="no"])
      LDFLAGS="$TEMP_LDFLAGS"
      CPPFLAGS="$TEMP_CPPFLAGS"
      CXXFLAGS="$TEMP_CXXFLAGS"
      AC_MSG_RESULT([$have_boost_process])
      if test "$have_boost_process" = "yes"; then
        use_external_signer="yes"
        AC_DEFINE([ENABLE_EXTERNAL_SIGNER], [1], [Define if external signer support is enabled])
      else
        if test "$use_external_signer" = "yes"; then
          AC_MSG_ERROR([External signing is not supported for this Boost version])
        fi
        use_external_signer="no";
      fi
    ;;
  esac
fi
AM_CONDITIONAL([ENABLE_EXTERNAL_SIGNER], [test "$use_external_signer" = "yes"])

dnl Do not compile with syscall sandbox support when compiling under the sanitizers.
dnl The sanitizers introduce use of syscalls that are not typically used in bitcoind
dnl (such as execve when the sanitizers execute llvm-symbolizer).
if test "$use_sanitizers" != ""; then
  AC_MSG_WARN([Specifying --with-sanitizers forces --without-seccomp since the sanitizers introduce use of syscalls not allowed by the bitcoind syscall sandbox (-sandbox=<mode>).])
  seccomp_found=no
fi
if test "$seccomp_found" != "no"; then
  AC_MSG_CHECKING([for seccomp-bpf (Linux x86-64)])
  AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[
      @%:@include <linux/seccomp.h>
    ]], [[
      #if !defined(__x86_64__)
      #  error Syscall sandbox is an experimental feature currently available only under Linux x86-64.
      #endif
    ]])],[
      AC_MSG_RESULT([yes])
      seccomp_found="yes"
      AC_DEFINE([USE_SYSCALL_SANDBOX], [1], [Define this symbol to build with syscall sandbox support.])
    ],[
      AC_MSG_RESULT([no])
      seccomp_found="no"
  ])
fi
dnl Currently only enable -sandbox=<mode> feature if seccomp is found.
dnl In the future, sandboxing could be also be supported with other
dnl sandboxing mechanisms besides seccomp.
use_syscall_sandbox=$seccomp_found
AM_CONDITIONAL([ENABLE_SYSCALL_SANDBOX], [test "$use_syscall_sandbox" != "no"])

dnl Check for reduced exports
if test "$use_reduce_exports" = "yes"; then
  AX_CHECK_COMPILE_FLAG([-fvisibility=hidden], [CXXFLAGS="$CXXFLAGS -fvisibility=hidden"],
  [AC_MSG_ERROR([Cannot set hidden symbol visibility. Use --disable-reduce-exports.])], [$CXXFLAG_WERROR])
  AX_CHECK_LINK_FLAG([-Wl,--exclude-libs,ALL], [RELDFLAGS="-Wl,--exclude-libs,ALL"], [], [$LDFLAG_WERROR])
fi

if test "$use_tests" = "yes"; then

  if test "$HEXDUMP" = ""; then
    AC_MSG_ERROR([hexdump is required for tests])
  fi
fi

dnl libevent check

if test "$build_bitcoin_cli$build_bitcoind$bitcoin_enable_qt$use_tests$use_bench" != "nonononono"; then
  PKG_CHECK_MODULES([EVENT], [libevent >= 2.0.21], [use_libevent=yes], [AC_MSG_ERROR([libevent version 2.0.21 or greater not found.])])
  if test "$TARGET_OS" != "windows"; then
    PKG_CHECK_MODULES([EVENT_PTHREADS], [libevent_pthreads >= 2.0.21],, [AC_MSG_ERROR([libevent_pthreads version 2.0.21 or greater not found.])])
  fi

  if test "$suppress_external_warnings" != "no"; then
    EVENT_CFLAGS=SUPPRESS_WARNINGS($EVENT_CFLAGS)
  fi
fi

if test x$use_libevent = xyes; then
  TEMP_CXXFLAGS="$CXXFLAGS"
  CXXFLAGS="$CXXFLAGS $EVENT_CFLAGS"
  AC_MSG_CHECKING([if evhttp_connection_get_peer expects const char**])
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
      #include <cstdint>
      #include <event2/http.h>
    ]], [[
      evhttp_connection *conn = (evhttp_connection *)1;
      const char *host;
      uint16_t port;

      evhttp_connection_get_peer(conn, &host, &port);
    ]])],
    [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_EVHTTP_CONNECTION_GET_PEER_CONST_CHAR], [1], [Define this symbol if evhttp_connection_get_peer expects const char**]) ],
    [ AC_MSG_RESULT([no]) ]
  )
  CXXFLAGS="$TEMP_CXXFLAGS"
fi

dnl QR Code encoding library check

if test "$use_qr" != "no"; then
  BITCOIN_QT_CHECK([PKG_CHECK_MODULES([QR], [libqrencode], [have_qrencode=yes], [have_qrencode=no])])
fi

dnl ZMQ check

if test "$use_zmq" = "yes"; then
  PKG_CHECK_MODULES([ZMQ], [libzmq >= 4],
    AC_DEFINE([ENABLE_ZMQ], [1], [Define to 1 to enable ZMQ functions]),
    [AC_DEFINE([ENABLE_ZMQ], [0], [Define to 1 to enable ZMQ functions])
    AC_MSG_WARN([libzmq version 4.x or greater not found, disabling])
    use_zmq=no])
else
  AC_DEFINE_UNQUOTED([ENABLE_ZMQ], [0], [Define to 1 to enable ZMQ functions])
fi

if test "$use_zmq" = "yes"; then
  dnl Assume libzmq was built for static linking
  case $host in
    *mingw*)
      ZMQ_CFLAGS="$ZMQ_CFLAGS -DZMQ_STATIC"
    ;;
  esac
fi

dnl libmultiprocess library check

libmultiprocess_found=no
if test "$with_libmultiprocess" = "yes" || test "$with_libmultiprocess" = "auto"; then
  PKG_CHECK_MODULES([LIBMULTIPROCESS], [libmultiprocess], [
     libmultiprocess_found=yes;
     libmultiprocess_prefix=`$PKG_CONFIG --variable=prefix libmultiprocess`;
  ], [true])
elif test "$with_libmultiprocess" != "no"; then
  AC_MSG_ERROR([--with-libmultiprocess=$with_libmultiprocess value is not yes, auto, or no])
fi

dnl Enable multiprocess check

if test "$enable_multiprocess" = "yes"; then
  if test "$libmultiprocess_found" != "yes"; then
    AC_MSG_ERROR([--enable-multiprocess=yes option specified but libmultiprocess library was not found. May need to install libmultiprocess library, or specify install path with PKG_CONFIG_PATH environment variable. Running 'pkg-config --debug libmultiprocess' may be helpful for debugging.])
  fi
  build_multiprocess=yes
elif test "$enable_multiprocess" = "auto"; then
  build_multiprocess=$libmultiprocess_found
else
  build_multiprocess=no
fi

AM_CONDITIONAL([BUILD_MULTIPROCESS], [test "$build_multiprocess" = "yes"])
AM_CONDITIONAL([BUILD_BITCOIN_NODE], [test "$build_multiprocess" = "yes"])
AM_CONDITIONAL([BUILD_BITCOIN_GUI], [test "$build_multiprocess" = "yes"])

dnl codegen tools check

if test "$build_multiprocess" != "no"; then
  if test "$with_mpgen" = "yes" || test "$with_mpgen" = "auto"; then
    MPGEN_PREFIX="$libmultiprocess_prefix"
  elif test "$with_mpgen" != "no"; then
    MPGEN_PREFIX="$with_mpgen";
  fi
  AC_SUBST(MPGEN_PREFIX)
fi

AC_MSG_CHECKING([whether to build bitcoind])
AM_CONDITIONAL([BUILD_BITCOIND], [test $build_bitcoind = "yes"])
AC_MSG_RESULT($build_bitcoind)

AC_MSG_CHECKING([whether to build bitcoin-cli])
AM_CONDITIONAL([BUILD_BITCOIN_CLI], [test $build_bitcoin_cli = "yes"])
AC_MSG_RESULT($build_bitcoin_cli)

AC_MSG_CHECKING([whether to build bitcoin-tx])
AM_CONDITIONAL([BUILD_BITCOIN_TX], [test $build_bitcoin_tx = "yes"])
AC_MSG_RESULT($build_bitcoin_tx)

AC_MSG_CHECKING([whether to build bitcoin-wallet])
AM_CONDITIONAL([BUILD_BITCOIN_WALLET], [test $build_bitcoin_wallet = "yes"])
AC_MSG_RESULT($build_bitcoin_wallet)

AC_MSG_CHECKING([whether to build bitcoin-util])
AM_CONDITIONAL([BUILD_BITCOIN_UTIL], [test $build_bitcoin_util = "yes"])
AC_MSG_RESULT($build_bitcoin_util)

AC_MSG_CHECKING([whether to build libraries])
AM_CONDITIONAL([BUILD_BITCOIN_LIBS], [test $build_bitcoin_libs = "yes"])
if test "$build_bitcoin_libs" = "yes"; then
  AC_DEFINE([HAVE_CONSENSUS_LIB], [1], [Define this symbol if the consensus lib has been built])
  AC_CONFIG_FILES([libbitcoinconsensus.pc:libbitcoinconsensus.pc.in])
fi
AC_MSG_RESULT($build_bitcoin_libs)

AC_LANG_POP

if test "$use_ccache" != "no"; then
  AC_MSG_CHECKING([if ccache should be used])
  if test "$CCACHE" = ""; then
    if test "$use_ccache" = "yes"; then
      AC_MSG_ERROR([ccache not found.]);
    else
      use_ccache=no
    fi
  else
    use_ccache=yes
    CC="$ac_cv_path_CCACHE $CC"
    CXX="$ac_cv_path_CCACHE $CXX"
  fi
  AC_MSG_RESULT($use_ccache)
  if test "$use_ccache" = "yes"; then
    AX_CHECK_COMPILE_FLAG([-fdebug-prefix-map=A=B], [DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -fdebug-prefix-map=\$(abs_top_srcdir)=."], [], [$CXXFLAG_WERROR])
    AX_CHECK_PREPROC_FLAG([-fmacro-prefix-map=A=B], [DEBUG_CPPFLAGS="$DEBUG_CPPFLAGS -fmacro-prefix-map=\$(abs_top_srcdir)=."], [], [$CXXFLAG_WERROR])
  fi
fi

dnl enable wallet
AC_MSG_CHECKING([if wallet should be enabled])
if test "$enable_wallet" != "no"; then
  AC_MSG_RESULT([yes])
  AC_DEFINE_UNQUOTED([ENABLE_WALLET],[1],[Define to 1 to enable wallet functions])
  enable_wallet=yes

else
  AC_MSG_RESULT([no])
fi

dnl enable upnp support
AC_MSG_CHECKING([whether to build with support for UPnP])
if test "$have_miniupnpc" = "no"; then
  if test "$use_upnp" = "yes"; then
     AC_MSG_ERROR([UPnP requested but cannot be built. Use --without-miniupnpc])
  fi
  AC_MSG_RESULT([no])
  use_upnp=no
else
  if test "$use_upnp" != "no"; then
    AC_MSG_RESULT([yes])
    AC_MSG_CHECKING([whether to build with UPnP enabled by default])
    use_upnp=yes
    upnp_setting=0
    if test "$use_upnp_default" != "no"; then
      use_upnp_default=yes
      upnp_setting=1
    fi
    AC_MSG_RESULT([$use_upnp_default])
    AC_DEFINE_UNQUOTED([USE_UPNP],[$upnp_setting],[UPnP support not compiled if undefined, otherwise value (0 or 1) determines default state])
    if test "$TARGET_OS" = "windows"; then
      MINIUPNPC_CPPFLAGS="-DSTATICLIB -DMINIUPNP_STATICLIB"
    fi
  else
    AC_MSG_RESULT([no])
  fi
fi

dnl Enable NAT-PMP support.
AC_MSG_CHECKING([whether to build with support for NAT-PMP])
if test "$have_natpmp" = "no"; then
  if test "$use_natpmp" = "yes"; then
     AC_MSG_ERROR([NAT-PMP requested but cannot be built. Use --without-natpmp])
  fi
  AC_MSG_RESULT([no])
  use_natpmp=no
else
  if test "$use_natpmp" != "no"; then
    AC_MSG_RESULT([yes])
    AC_MSG_CHECKING([whether to build with NAT-PMP enabled by default])
    use_natpmp=yes
    natpmp_setting=0
    if test "$use_natpmp_default" != "no"; then
      use_natpmp_default=yes
      natpmp_setting=1
    fi
    AC_MSG_RESULT($use_natpmp_default)
    AC_DEFINE_UNQUOTED([USE_NATPMP], [$natpmp_setting], [NAT-PMP support not compiled if undefined, otherwise value (0 or 1) determines default state])
    if test "$TARGET_OS" = "windows"; then
      NATPMP_CPPFLAGS="-DSTATICLIB -DNATPMP_STATICLIB"
    fi
  else
    AC_MSG_RESULT([no])
  fi
fi

dnl these are only used when qt is enabled
BUILD_TEST_QT=""
if test "$bitcoin_enable_qt" != "no"; then
  dnl enable dbus support
  AC_MSG_CHECKING([whether to build GUI with support for D-Bus])
  if test "$bitcoin_enable_qt_dbus" != "no"; then
    AC_DEFINE([USE_DBUS], [1], [Define if dbus support should be compiled in])
  fi
  AC_MSG_RESULT([$bitcoin_enable_qt_dbus])

  dnl enable qr support
  AC_MSG_CHECKING([whether to build GUI with support for QR codes])
  if test "$have_qrencode" = "no"; then
    if test "$use_qr" = "yes"; then
      AC_MSG_ERROR([QR support requested but cannot be built. Use --without-qrencode])
    fi
    use_qr=no
  else
    if test "$use_qr" != "no"; then
      AC_DEFINE([USE_QRCODE], [1], [Define if QR support should be compiled in])
      use_qr=yes
    fi
  fi
  AC_MSG_RESULT([$use_qr])

  if test "$XGETTEXT" = ""; then
    AC_MSG_WARN([xgettext is required to update qt translations])
  fi

  AC_MSG_CHECKING([whether to build test_bitcoin-qt])
  if test "$use_gui_tests$bitcoin_enable_qt_test" = "yesyes"; then
    AC_MSG_RESULT([yes])
    BUILD_TEST_QT="yes"
  else
    AC_MSG_RESULT([no])
  fi
fi

AM_CONDITIONAL([ENABLE_ZMQ], [test "$use_zmq" = "yes"])

AC_MSG_CHECKING([whether to build test_bitcoin])
if test "$use_tests" = "yes"; then
  if test "$enable_fuzz" = "yes"; then
    AC_MSG_RESULT([no, because fuzzing is enabled])
  else
    AC_MSG_RESULT([yes])
  fi
  BUILD_TEST="yes"
else
  AC_MSG_RESULT([no])
  BUILD_TEST=""
fi

AC_MSG_CHECKING([whether to reduce exports])
if test "$use_reduce_exports" = "yes"; then
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

if test "$build_bitcoin_wallet$build_bitcoin_cli$build_bitcoin_tx$build_bitcoin_libs$build_bitcoind$bitcoin_enable_qt$use_bench$use_tests" = "nononononononono"; then
  AC_MSG_ERROR([No targets! Please specify at least one of: --with-utils --with-libs --with-daemon --with-gui --enable-bench or --enable-tests])
fi

if test "$enable_fuzz_binary" = "yes"; then
  CHECK_RUNTIME_LIB
fi

AM_CONDITIONAL([TARGET_DARWIN], [test "$TARGET_OS" = "darwin"])
AM_CONDITIONAL([BUILD_DARWIN], [test "$BUILD_OS" = "darwin"])
AM_CONDITIONAL([TARGET_LINUX], [test "$TARGET_OS" = "linux"])
AM_CONDITIONAL([TARGET_WINDOWS], [test "$TARGET_OS" = "windows"])
AM_CONDITIONAL([ENABLE_WALLET], [test "$enable_wallet" = "yes"])
AM_CONDITIONAL([USE_SQLITE], [test "$use_sqlite" = "yes"])
AM_CONDITIONAL([USE_BDB], [test "$use_bdb" = "yes"])
AM_CONDITIONAL([ENABLE_TESTS], [test "$BUILD_TEST" = "yes"])
AM_CONDITIONAL([ENABLE_FUZZ], [test "$enable_fuzz" = "yes"])
AM_CONDITIONAL([ENABLE_FUZZ_BINARY], [test "$enable_fuzz_binary" = "yes"])
AM_CONDITIONAL([ENABLE_QT], [test "$bitcoin_enable_qt" = "yes"])
AM_CONDITIONAL([ENABLE_QT_TESTS], [test "$BUILD_TEST_QT" = "yes"])
AM_CONDITIONAL([ENABLE_BENCH], [test "$use_bench" = "yes"])
AM_CONDITIONAL([USE_QRCODE], [test "$use_qr" = "yes"])
AM_CONDITIONAL([USE_LCOV], [test "$use_lcov" = "yes"])
AM_CONDITIONAL([USE_LIBEVENT], [test "$use_libevent" = "yes"])
AM_CONDITIONAL([HARDEN], [test "$use_hardening" = "yes"])
AM_CONDITIONAL([ENABLE_SSE42], [test "$enable_sse42" = "yes"])
AM_CONDITIONAL([ENABLE_SSE41], [test "$enable_sse41" = "yes"])
AM_CONDITIONAL([ENABLE_AVX2], [test "$enable_avx2" = "yes"])
AM_CONDITIONAL([ENABLE_X86_SHANI], [test "$enable_x86_shani" = "yes"])
AM_CONDITIONAL([ENABLE_ARM_CRC], [test "$enable_arm_crc" = "yes"])
AM_CONDITIONAL([ENABLE_ARM_SHANI], [test "$enable_arm_shani" = "yes"])
AM_CONDITIONAL([USE_ASM], [test "$use_asm" = "yes"])
AM_CONDITIONAL([WORDS_BIGENDIAN], [test "$ac_cv_c_bigendian" = "yes"])
AM_CONDITIONAL([USE_NATPMP], [test "$use_natpmp" = "yes"])
AM_CONDITIONAL([USE_UPNP], [test "$use_upnp" = "yes"])

dnl for minisketch
AM_CONDITIONAL([ENABLE_CLMUL], [test "$enable_clmul" = "yes"])
AM_CONDITIONAL([HAVE_CLZ], [test "$have_clzl$have_clzll" = "yesyes"])

AC_DEFINE([CLIENT_VERSION_MAJOR], [_CLIENT_VERSION_MAJOR], [Major version])
AC_DEFINE([CLIENT_VERSION_MINOR], [_CLIENT_VERSION_MINOR], [Minor version])
AC_DEFINE([CLIENT_VERSION_BUILD], [_CLIENT_VERSION_BUILD], [Version Build])
AC_DEFINE([CLIENT_VERSION_IS_RELEASE], [_CLIENT_VERSION_IS_RELEASE], [Version is release])
AC_DEFINE([COPYRIGHT_YEAR], [_COPYRIGHT_YEAR], [Copyright year])
AC_DEFINE([COPYRIGHT_HOLDERS], ["_COPYRIGHT_HOLDERS"], [Copyright holder(s) before %s replacement])
AC_DEFINE([COPYRIGHT_HOLDERS_SUBSTITUTION], ["_COPYRIGHT_HOLDERS_SUBSTITUTION"], [Replacement for %s in copyright holders string])
define(_COPYRIGHT_HOLDERS_FINAL, [patsubst(_COPYRIGHT_HOLDERS, [%s], [_COPYRIGHT_HOLDERS_SUBSTITUTION])])
AC_DEFINE([COPYRIGHT_HOLDERS_FINAL], ["_COPYRIGHT_HOLDERS_FINAL"], [Copyright holder(s)])
AC_SUBST(CLIENT_VERSION_MAJOR, _CLIENT_VERSION_MAJOR)
AC_SUBST(CLIENT_VERSION_MINOR, _CLIENT_VERSION_MINOR)
AC_SUBST(CLIENT_VERSION_BUILD, _CLIENT_VERSION_BUILD)
AC_SUBST(CLIENT_VERSION_IS_RELEASE, _CLIENT_VERSION_IS_RELEASE)
AC_SUBST(COPYRIGHT_YEAR, _COPYRIGHT_YEAR)
AC_SUBST(COPYRIGHT_HOLDERS, "_COPYRIGHT_HOLDERS")
AC_SUBST(COPYRIGHT_HOLDERS_SUBSTITUTION, "_COPYRIGHT_HOLDERS_SUBSTITUTION")
AC_SUBST(COPYRIGHT_HOLDERS_FINAL, "_COPYRIGHT_HOLDERS_FINAL")
AC_SUBST(BITCOIN_DAEMON_NAME)
AC_SUBST(BITCOIN_GUI_NAME)
AC_SUBST(BITCOIN_CLI_NAME)
AC_SUBST(BITCOIN_TX_NAME)
AC_SUBST(BITCOIN_UTIL_NAME)
AC_SUBST(BITCOIN_WALLET_TOOL_NAME)
AC_SUBST(BITCOIN_MP_NODE_NAME)
AC_SUBST(BITCOIN_MP_GUI_NAME)

AC_SUBST(RELDFLAGS)
AC_SUBST(DEBUG_CPPFLAGS)
AC_SUBST(WARN_CXXFLAGS)
AC_SUBST(NOWARN_CXXFLAGS)
AC_SUBST(DEBUG_CXXFLAGS)
AC_SUBST(ERROR_CXXFLAGS)
AC_SUBST(GPROF_CXXFLAGS)
AC_SUBST(GPROF_LDFLAGS)
AC_SUBST(HARDENED_CXXFLAGS)
AC_SUBST(HARDENED_CPPFLAGS)
AC_SUBST(HARDENED_LDFLAGS)
AC_SUBST(LTO_CXXFLAGS)
AC_SUBST(LTO_LDFLAGS)
AC_SUBST(PIC_FLAGS)
AC_SUBST(PIE_FLAGS)
AC_SUBST(SANITIZER_CXXFLAGS)
AC_SUBST(SANITIZER_LDFLAGS)
AC_SUBST(SSE42_CXXFLAGS)
AC_SUBST(SSE41_CXXFLAGS)
AC_SUBST(CLMUL_CXXFLAGS)
AC_SUBST(AVX2_CXXFLAGS)
AC_SUBST(X86_SHANI_CXXFLAGS)
AC_SUBST(ARM_CRC_CXXFLAGS)
AC_SUBST(ARM_SHANI_CXXFLAGS)
AC_SUBST(LIBTOOL_APP_LDFLAGS)
AC_SUBST(USE_SQLITE)
AC_SUBST(USE_BDB)
AC_SUBST(ENABLE_EXTERNAL_SIGNER)
AC_SUBST(USE_UPNP)
AC_SUBST(USE_QRCODE)
AC_SUBST(TESTDEFS)
AC_SUBST(MINIUPNPC_CPPFLAGS)
AC_SUBST(MINIUPNPC_LIBS)
AC_SUBST(NATPMP_CPPFLAGS)
AC_SUBST(NATPMP_LIBS)
AC_SUBST(HAVE_GMTIME_R)
AC_SUBST(HAVE_FDATASYNC)
AC_SUBST(HAVE_FULLFSYNC)
AC_SUBST(HAVE_O_CLOEXEC)
AC_SUBST(HAVE_BUILTIN_PREFETCH)
AC_SUBST(HAVE_MM_PREFETCH)
AC_SUBST(HAVE_STRONG_GETAUXVAL)
AC_SUBST(ANDROID_ARCH)
AC_SUBST(HAVE_EVHTTP_CONNECTION_GET_PEER_CONST_CHAR)
AC_CONFIG_FILES([Makefile src/Makefile doc/man/Makefile share/setup.nsi share/qt/Info.plist test/config.ini])
AC_CONFIG_FILES([contrib/devtools/split-debug.sh],[chmod +x contrib/devtools/split-debug.sh])
AM_COND_IF([HAVE_DOXYGEN], [AC_CONFIG_FILES([doc/Doxyfile])])
AC_CONFIG_LINKS([contrib/devtools/security-check.py:contrib/devtools/security-check.py])
AC_CONFIG_LINKS([contrib/devtools/symbol-check.py:contrib/devtools/symbol-check.py])
AC_CONFIG_LINKS([contrib/devtools/test-security-check.py:contrib/devtools/test-security-check.py])
AC_CONFIG_LINKS([contrib/devtools/test-symbol-check.py:contrib/devtools/test-symbol-check.py])
AC_CONFIG_LINKS([contrib/filter-lcov.py:contrib/filter-lcov.py])
AC_CONFIG_LINKS([contrib/macdeploy/background.tiff:contrib/macdeploy/background.tiff])
AC_CONFIG_LINKS([test/functional/test_runner.py:test/functional/test_runner.py])
AC_CONFIG_LINKS([test/fuzz/test_runner.py:test/fuzz/test_runner.py])
AC_CONFIG_LINKS([test/util/test_runner.py:test/util/test_runner.py])
AC_CONFIG_LINKS([test/util/rpcauth-test.py:test/util/rpcauth-test.py])

dnl boost's m4 checks do something really nasty: they export these vars. As a
dnl result, they leak into secp256k1's configure and crazy things happen.
dnl Until this is fixed upstream and we've synced, we'll just un-export them.
CPPFLAGS_TEMP="$CPPFLAGS"
unset CPPFLAGS
CPPFLAGS="$CPPFLAGS_TEMP"

LDFLAGS_TEMP="$LDFLAGS"
unset LDFLAGS
LDFLAGS="$LDFLAGS_TEMP"

LIBS_TEMP="$LIBS"
unset LIBS
LIBS="$LIBS_TEMP"

PKGCONFIG_PATH_TEMP="$PKG_CONFIG_PATH"
unset PKG_CONFIG_PATH
PKG_CONFIG_PATH="$PKGCONFIG_PATH_TEMP"

PKGCONFIG_LIBDIR_TEMP="$PKG_CONFIG_LIBDIR"
unset PKG_CONFIG_LIBDIR
PKG_CONFIG_LIBDIR="$PKGCONFIG_LIBDIR_TEMP"

ac_configure_args="${ac_configure_args} --disable-shared --with-pic --enable-benchmark=no --enable-module-recovery --enable-module-schnorrsig --enable-experimental"
AC_CONFIG_SUBDIRS([src/secp256k1])

AC_OUTPUT

dnl Replace the BUILDDIR path with the correct Windows path if compiling on Native Windows
case ${OS} in
   *Windows*)
     sed  's/BUILDDIR="\/\([[a-z]]\)/BUILDDIR="\1:/'  test/config.ini > test/config-2.ini
     mv test/config-2.ini test/config.ini
   ;;
esac

echo
echo "Options used to compile and link:"
echo "  external signer = $use_external_signer"
echo "  multiprocess    = $build_multiprocess"
echo "  with experimental syscall sandbox support = $use_syscall_sandbox"
echo "  with libs       = $build_bitcoin_libs"
echo "  with wallet     = $enable_wallet"
if test "$enable_wallet" != "no"; then
    echo "    with sqlite   = $use_sqlite"
    echo "    with bdb      = $use_bdb"
fi
echo "  with gui / qt   = $bitcoin_enable_qt"
if test $bitcoin_enable_qt != "no"; then
    echo "    with qr       = $use_qr"
fi
echo "  with zmq        = $use_zmq"
if test $enable_fuzz = "no"; then
    echo "  with test       = $use_tests"
else
    echo "  with test       = not building test_bitcoin because fuzzing is enabled"
fi
echo "  with fuzz binary = $enable_fuzz_binary"
echo "  with bench      = $use_bench"
echo "  with upnp       = $use_upnp"
echo "  with natpmp     = $use_natpmp"
echo "  use asm         = $use_asm"
echo "  USDT tracing    = $use_usdt"
echo "  sanitizers      = $use_sanitizers"
echo "  debug enabled   = $enable_debug"
echo "  gprof enabled   = $enable_gprof"
echo "  werror          = $enable_werror"
echo "  LTO             = $enable_lto"
echo
echo "  target os       = $host_os"
echo "  build os        = $build_os"
echo
echo "  CC              = $CC"
echo "  CFLAGS          = $PTHREAD_CFLAGS $CFLAGS"
echo "  CPPFLAGS        = $DEBUG_CPPFLAGS $HARDENED_CPPFLAGS $CPPFLAGS"
echo "  CXX             = $CXX"
echo "  CXXFLAGS        = $LTO_CXXFLAGS $DEBUG_CXXFLAGS $HARDENED_CXXFLAGS $WARN_CXXFLAGS $NOWARN_CXXFLAGS $ERROR_CXXFLAGS $GPROF_CXXFLAGS $CXXFLAGS"
echo "  LDFLAGS         = $LTO_LDFLAGS $PTHREAD_LIBS $HARDENED_LDFLAGS $GPROF_LDFLAGS $LDFLAGS"
echo "  ARFLAGS         = $ARFLAGS"
echo