aboutsummaryrefslogtreecommitdiff
path: root/src/secp256k1/configure.ac
blob: adae1897872d700ae51b69ece1c2bb98a964bdc4 (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
AC_PREREQ([2.60])

# The package (a.k.a. release) version is based on semantic versioning 2.0.0 of
# the API. All changes in experimental modules are treated as
# backwards-compatible and therefore at most increase the minor version.
define(_PKG_VERSION_MAJOR, 0)
define(_PKG_VERSION_MINOR, 5)
define(_PKG_VERSION_PATCH, 1)
define(_PKG_VERSION_IS_RELEASE, false)

# The library version is based on libtool versioning of the ABI. The set of
# rules for updating the version can be found here:
# https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
# All changes in experimental modules are treated as if they don't affect the
# interface and therefore only increase the revision.
define(_LIB_VERSION_CURRENT, 4)
define(_LIB_VERSION_REVISION, 1)
define(_LIB_VERSION_AGE, 2)

AC_INIT([libsecp256k1],m4_join([.], _PKG_VERSION_MAJOR, _PKG_VERSION_MINOR, _PKG_VERSION_PATCH)m4_if(_PKG_VERSION_IS_RELEASE, [true], [], [-dev]),[https://github.com/bitcoin-core/secp256k1/issues],[libsecp256k1],[https://github.com/bitcoin-core/secp256k1])

AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIR([build-aux/m4])
AC_CANONICAL_HOST

# Require Automake 1.11.2 for AM_PROG_AR
AM_INIT_AUTOMAKE([1.11.2 foreign subdir-objects])

# Make the compilation flags quiet unless V=1 is used.
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

if test "${CFLAGS+set}" = "set"; then
  CFLAGS_overridden=yes
else
  CFLAGS_overridden=no
fi
AC_PROG_CC
AM_PROG_AS
AM_PROG_AR

# Clear some cache variables as a workaround for a bug that appears due to a bad
# interaction between AM_PROG_AR and LT_INIT when combining MSVC's archiver lib.exe.
# https://debbugs.gnu.org/cgi/bugreport.cgi?bug=54421
AS_UNSET(ac_cv_prog_AR)
AS_UNSET(ac_cv_prog_ac_ct_AR)
LT_INIT([win32-dll])

build_windows=no

case $host_os in
  *darwin*)
     if  test x$cross_compiling != xyes; then
       AC_CHECK_PROG([BREW], brew, brew)
       if test x$BREW = xbrew; then
         # These Homebrew packages may be keg-only, meaning that they won't be found
         # in expected paths because they may conflict with system files. Ask
         # Homebrew where each one is located, then adjust paths accordingly.
         if $BREW list --versions valgrind >/dev/null; then
           valgrind_prefix=$($BREW --prefix valgrind 2>/dev/null)
           VALGRIND_CPPFLAGS="-I$valgrind_prefix/include"
         fi
       else
         AC_CHECK_PROG([PORT], port, port)
         # If homebrew isn't installed and macports is, add the macports default paths
         # as a last resort.
         if test x$PORT = xport; then
           CPPFLAGS="$CPPFLAGS -isystem /opt/local/include"
           LDFLAGS="$LDFLAGS -L/opt/local/lib"
         fi
       fi
     fi
   ;;
   cygwin*|mingw*)
     build_windows=yes
   ;;
esac

# Try if some desirable compiler flags are supported and append them to SECP_CFLAGS.
#
# These are our own flags, so we append them to our own SECP_CFLAGS variable (instead of CFLAGS) as
# recommended in the automake manual (Section "Flag Variables Ordering"). CFLAGS belongs to the user
# and we are not supposed to touch it. In the Makefile, we will need to ensure that SECP_CFLAGS
# is prepended to CFLAGS when invoking the compiler so that the user always has the last word (flag).
#
# Another advantage of not touching CFLAGS is that the contents of CFLAGS will be picked up by
# libtool for compiling helper executables. For example, when compiling for Windows, libtool will
# generate entire wrapper executables (instead of simple wrapper scripts as on Unix) to ensure
# proper operation of uninstalled programs linked by libtool against the uninstalled shared library.
# These executables are compiled from C source file for which our flags may not be appropriate,
# e.g., -std=c89 flag has lead to undesirable warnings in the past.
#
# TODO We should analogously not touch CPPFLAGS and LDFLAGS but currently there are no issues.
AC_DEFUN([SECP_TRY_APPEND_DEFAULT_CFLAGS], [
    # GCC and compatible (incl. clang)
    if test "x$GCC" = "xyes"; then
      # Try to append -Werror to CFLAGS temporarily. Otherwise checks for some unsupported
      # flags will succeed.
      # Note that failure to append -Werror does not necessarily mean that -Werror is not
      # supported. The compiler may already be warning about something unrelated, for example
      # about some path issue. If that is the case, -Werror cannot be used because all
      # of those warnings would be turned into errors.
      SECP_TRY_APPEND_DEFAULT_CFLAGS_saved_CFLAGS="$CFLAGS"
      SECP_TRY_APPEND_CFLAGS([-Werror], CFLAGS)

      SECP_TRY_APPEND_CFLAGS([-std=c89 -pedantic -Wno-long-long -Wnested-externs -Wshadow -Wstrict-prototypes -Wundef], $1) # GCC >= 3.0, -Wlong-long is implied by -pedantic.
      SECP_TRY_APPEND_CFLAGS([-Wno-overlength-strings], $1) # GCC >= 4.2, -Woverlength-strings is implied by -pedantic.
      SECP_TRY_APPEND_CFLAGS([-Wall], $1) # GCC >= 2.95 and probably many other compilers
      SECP_TRY_APPEND_CFLAGS([-Wno-unused-function], $1) # GCC >= 3.0, -Wunused-function is implied by -Wall.
      SECP_TRY_APPEND_CFLAGS([-Wextra], $1) # GCC >= 3.4, this is the newer name of -W, which we don't use because older GCCs will warn about unused functions.
      SECP_TRY_APPEND_CFLAGS([-Wcast-align], $1) # GCC >= 2.95
      SECP_TRY_APPEND_CFLAGS([-Wcast-align=strict], $1) # GCC >= 8.0
      SECP_TRY_APPEND_CFLAGS([-Wconditional-uninitialized], $1) # Clang >= 3.0 only
      SECP_TRY_APPEND_CFLAGS([-Wreserved-identifier], $1) # Clang >= 13.0 only
      SECP_TRY_APPEND_CFLAGS([-fvisibility=hidden], $1) # GCC >= 4.0

      CFLAGS="$SECP_TRY_APPEND_DEFAULT_CFLAGS_saved_CFLAGS"
    fi

    # MSVC
    # Assume MSVC if we're building for Windows but not with GCC or compatible;
    # libtool makes the same assumption internally.
    # Note that "/opt" and "-opt" are equivalent for MSVC; we use "-opt" because "/opt" looks like a path.
    if test x"$GCC" != x"yes" && test x"$build_windows" = x"yes"; then
      SECP_TRY_APPEND_CFLAGS([-W3], $1) # Production quality warning level.
      SECP_TRY_APPEND_CFLAGS([-wd4146], $1) # Disable warning C4146 "unary minus operator applied to unsigned type, result still unsigned".
      SECP_TRY_APPEND_CFLAGS([-wd4244], $1) # Disable warning C4244 "'conversion' conversion from 'type1' to 'type2', possible loss of data".
      SECP_TRY_APPEND_CFLAGS([-wd4267], $1) # Disable warning C4267 "'var' : conversion from 'size_t' to 'type', possible loss of data".
      # Eliminate deprecation warnings for the older, less secure functions.
      CPPFLAGS="-D_CRT_SECURE_NO_WARNINGS $CPPFLAGS"
    fi
])
SECP_TRY_APPEND_DEFAULT_CFLAGS(SECP_CFLAGS)

###
### Define config arguments
###

# In dev mode, we enable all binaries and modules by default but individual options can still be overridden explicitly.
# Check for dev mode first because SECP_SET_DEFAULT needs enable_dev_mode set.
AC_ARG_ENABLE(dev_mode, [], [],
    [enable_dev_mode=no])

AC_ARG_ENABLE(benchmark,
    AS_HELP_STRING([--enable-benchmark],[compile benchmark [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_benchmark], [yes], [yes])])

AC_ARG_ENABLE(coverage,
    AS_HELP_STRING([--enable-coverage],[enable compiler flags to support kcov coverage analysis [default=no]]), [],
    [SECP_SET_DEFAULT([enable_coverage], [no], [no])])

AC_ARG_ENABLE(tests,
    AS_HELP_STRING([--enable-tests],[compile tests [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_tests], [yes], [yes])])

AC_ARG_ENABLE(ctime_tests,
    AS_HELP_STRING([--enable-ctime-tests],[compile constant-time tests [default=yes if valgrind enabled]]), [],
    [SECP_SET_DEFAULT([enable_ctime_tests], [auto], [auto])])

AC_ARG_ENABLE(experimental,
    AS_HELP_STRING([--enable-experimental],[allow experimental configure options [default=no]]), [],
    [SECP_SET_DEFAULT([enable_experimental], [no], [yes])])

AC_ARG_ENABLE(exhaustive_tests,
    AS_HELP_STRING([--enable-exhaustive-tests],[compile exhaustive tests [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_exhaustive_tests], [yes], [yes])])

AC_ARG_ENABLE(examples,
    AS_HELP_STRING([--enable-examples],[compile the examples [default=no]]), [],
    [SECP_SET_DEFAULT([enable_examples], [no], [yes])])

AC_ARG_ENABLE(module_ecdh,
    AS_HELP_STRING([--enable-module-ecdh],[enable ECDH module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_ecdh], [yes], [yes])])

AC_ARG_ENABLE(module_recovery,
    AS_HELP_STRING([--enable-module-recovery],[enable ECDSA pubkey recovery module [default=no]]), [],
    [SECP_SET_DEFAULT([enable_module_recovery], [no], [yes])])

AC_ARG_ENABLE(module_extrakeys,
    AS_HELP_STRING([--enable-module-extrakeys],[enable extrakeys module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_extrakeys], [yes], [yes])])

AC_ARG_ENABLE(module_schnorrsig,
    AS_HELP_STRING([--enable-module-schnorrsig],[enable schnorrsig module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_schnorrsig], [yes], [yes])])

AC_ARG_ENABLE(module_ellswift,
    AS_HELP_STRING([--enable-module-ellswift],[enable ElligatorSwift module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_ellswift], [yes], [yes])])

AC_ARG_ENABLE(external_default_callbacks,
    AS_HELP_STRING([--enable-external-default-callbacks],[enable external default callback functions [default=no]]), [],
    [SECP_SET_DEFAULT([enable_external_default_callbacks], [no], [no])])

# Test-only override of the (autodetected by the C code) "widemul" setting.
# Legal values are:
#  * int64 (for [u]int64_t),
#  * int128 (for [unsigned] __int128),
#  * int128_struct (for int128 implemented as a structure),
#  *  and auto (the default).
AC_ARG_WITH([test-override-wide-multiply], [] ,[set_widemul=$withval], [set_widemul=auto])

AC_ARG_WITH([asm], [AS_HELP_STRING([--with-asm=x86_64|arm32|no|auto],
[assembly to use (experimental: arm32) [default=auto]])],[req_asm=$withval], [req_asm=auto])

AC_ARG_WITH([ecmult-window], [AS_HELP_STRING([--with-ecmult-window=SIZE],
[window size for ecmult precomputation for verification, specified as integer in range [2..24].]
[Larger values result in possibly better performance at the cost of an exponentially larger precomputed table.]
[The table will store 2^(SIZE-1) * 64 bytes of data but can be larger in memory due to platform-specific padding and alignment.]
[A window size larger than 15 will require you delete the prebuilt precomputed_ecmult.c file so that it can be rebuilt.]
[For very large window sizes, use "make -j 1" to reduce memory use during compilation.]
[The default value is a reasonable setting for desktop machines (currently 15). [default=15]]
)],
[set_ecmult_window=$withval], [set_ecmult_window=15])

AC_ARG_WITH([ecmult-gen-kb], [AS_HELP_STRING([--with-ecmult-gen-kb=2|22|86],
[The size of the precomputed table for signing in multiples of 1024 bytes (on typical platforms).]
[Larger values result in possibly better signing/keygeneration performance at the cost of a larger table.]
[The default value is a reasonable setting for desktop machines (currently 22). [default=22]]
)],
[set_ecmult_gen_kb=$withval], [set_ecmult_gen_kb=22])

AC_ARG_WITH([valgrind], [AS_HELP_STRING([--with-valgrind=yes|no|auto],
[Build with extra checks for running inside Valgrind [default=auto]]
)],
[req_valgrind=$withval], [req_valgrind=auto])

###
### Handle config options (except for modules)
###

if test x"$req_valgrind" = x"no"; then
  enable_valgrind=no
else
  SECP_VALGRIND_CHECK
  if test x"$has_valgrind" != x"yes"; then
    if test x"$req_valgrind" = x"yes"; then
      AC_MSG_ERROR([Valgrind support explicitly requested but valgrind/memcheck.h header not available])
    fi
    enable_valgrind=no
  else
    enable_valgrind=yes
  fi
fi

if test x"$enable_ctime_tests" = x"auto"; then
    enable_ctime_tests=$enable_valgrind
fi

print_msan_notice=no
if test x"$enable_ctime_tests" = x"yes"; then
  SECP_MSAN_CHECK
  # MSan on Clang >=16 reports unitialized memory in function parameters and return values, even if
  # the uninitalized variable is never actually "used". This is called "eager" checking, and it's
  # sounds like good idea for normal use of MSan. However, it yields many false positives in the
  # ctime_tests because many return values depend on secret (i.e., "uninitialized") values, and
  # we're only interested in detecting branches (which count as "uses") on secret data.
  if test x"$msan_enabled" = x"yes"; then
    SECP_TRY_APPEND_CFLAGS([-fno-sanitize-memory-param-retval], SECP_CFLAGS)
    print_msan_notice=yes
  fi
fi

if test x"$enable_coverage" = x"yes"; then
    SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DCOVERAGE=1"
    SECP_CFLAGS="-O0 --coverage $SECP_CFLAGS"
    # If coverage is enabled, and the user has not overridden CFLAGS,
    # override Autoconf's value "-g -O2" with "-g". Otherwise we'd end up
    # with "-O0 --coverage -g -O2".
    if test "$CFLAGS_overridden" = "no"; then
      CFLAGS="-g"
    fi
    LDFLAGS="--coverage $LDFLAGS"
else
    # Most likely the CFLAGS already contain -O2 because that is autoconf's default.
    # We still add it here because passing it twice is not an issue, and handling
    # this case would just add unnecessary complexity (see #896).
    SECP_CFLAGS="-O2 $SECP_CFLAGS"
fi

if test x"$req_asm" = x"auto"; then
  SECP_X86_64_ASM_CHECK
  if test x"$has_x86_64_asm" = x"yes"; then
    set_asm=x86_64
  fi
  if test x"$set_asm" = x; then
    set_asm=no
  fi
else
  set_asm=$req_asm
  case $set_asm in
  x86_64)
    SECP_X86_64_ASM_CHECK
    if test x"$has_x86_64_asm" != x"yes"; then
      AC_MSG_ERROR([x86_64 assembly requested but not available])
    fi
    ;;
  arm32)
    SECP_ARM32_ASM_CHECK
    if test x"$has_arm32_asm" != x"yes"; then
      AC_MSG_ERROR([ARM32 assembly requested but not available])
    fi
    ;;
  no)
    ;;
  *)
    AC_MSG_ERROR([invalid assembly selection])
    ;;
  esac
fi

# Select assembly
enable_external_asm=no

case $set_asm in
x86_64)
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DUSE_ASM_X86_64=1"
  ;;
arm32)
  enable_external_asm=yes
  ;;
no)
  ;;
*)
  AC_MSG_ERROR([invalid assembly selection])
  ;;
esac

if test x"$enable_external_asm" = x"yes"; then
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DUSE_EXTERNAL_ASM=1"
fi


# Select wide multiplication implementation
case $set_widemul in
int128_struct)
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DUSE_FORCE_WIDEMUL_INT128_STRUCT=1"
  ;;
int128)
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DUSE_FORCE_WIDEMUL_INT128=1"
  ;;
int64)
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DUSE_FORCE_WIDEMUL_INT64=1"
  ;;
auto)
  ;;
*)
  AC_MSG_ERROR([invalid wide multiplication implementation])
  ;;
esac

error_window_size=['window size for ecmult precomputation not an integer in range [2..24]']
case $set_ecmult_window in
''|*[[!0-9]]*)
  # no valid integer
  AC_MSG_ERROR($error_window_size)
  ;;
*)
  if test "$set_ecmult_window" -lt 2 -o "$set_ecmult_window" -gt 24 ; then
    # not in range
    AC_MSG_ERROR($error_window_size)
  fi
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DECMULT_WINDOW_SIZE=$set_ecmult_window"
  ;;
esac

case $set_ecmult_gen_kb in
2)
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DCOMB_BLOCKS=2 -DCOMB_TEETH=5"
  ;;
22)
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DCOMB_BLOCKS=11 -DCOMB_TEETH=6"
  ;;
86)
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DCOMB_BLOCKS=43 -DCOMB_TEETH=6"
  ;;
*)
  AC_MSG_ERROR(['ecmult gen table size not 2, 22 or 86'])
  ;;
esac

if test x"$enable_valgrind" = x"yes"; then
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES $VALGRIND_CPPFLAGS -DVALGRIND"
fi

# Add -Werror and similar flags passed from the outside (for testing, e.g., in CI).
# We don't want to set the user variable CFLAGS in CI because this would disable
# autoconf's logic for setting default CFLAGS, which we would like to test in CI.
SECP_CFLAGS="$SECP_CFLAGS $WERROR_CFLAGS"

###
### Handle module options
###

# Processing must be done in a reverse topological sorting of the dependency graph
# (dependent module first).
if test x"$enable_module_ellswift" = x"yes"; then
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DENABLE_MODULE_ELLSWIFT=1"
fi

if test x"$enable_module_schnorrsig" = x"yes"; then
  if test x"$enable_module_extrakeys" = x"no"; then
    AC_MSG_ERROR([Module dependency error: You have disabled the extrakeys module explicitly, but it is required by the schnorrsig module.])
  fi
  enable_module_extrakeys=yes
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DENABLE_MODULE_SCHNORRSIG=1"
fi

if test x"$enable_module_extrakeys" = x"yes"; then
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DENABLE_MODULE_EXTRAKEYS=1"
fi

if test x"$enable_module_recovery" = x"yes"; then
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DENABLE_MODULE_RECOVERY=1"
fi

if test x"$enable_module_ecdh" = x"yes"; then
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DENABLE_MODULE_ECDH=1"
fi

if test x"$enable_external_default_callbacks" = x"yes"; then
  SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DUSE_EXTERNAL_DEFAULT_CALLBACKS=1"
fi

###
### Check for --enable-experimental if necessary
###

if test x"$enable_experimental" = x"no"; then
  if test x"$set_asm" = x"arm32"; then
    AC_MSG_ERROR([ARM32 assembly is experimental. Use --enable-experimental to allow.])
  fi
fi

###
### Generate output
###

AC_CONFIG_FILES([Makefile libsecp256k1.pc])
AC_SUBST(SECP_CFLAGS)
AC_SUBST(SECP_CONFIG_DEFINES)
AM_CONDITIONAL([ENABLE_COVERAGE], [test x"$enable_coverage" = x"yes"])
AM_CONDITIONAL([USE_TESTS], [test x"$enable_tests" != x"no"])
AM_CONDITIONAL([USE_CTIME_TESTS], [test x"$enable_ctime_tests" = x"yes"])
AM_CONDITIONAL([USE_EXHAUSTIVE_TESTS], [test x"$enable_exhaustive_tests" != x"no"])
AM_CONDITIONAL([USE_EXAMPLES], [test x"$enable_examples" != x"no"])
AM_CONDITIONAL([USE_BENCHMARK], [test x"$enable_benchmark" = x"yes"])
AM_CONDITIONAL([ENABLE_MODULE_ECDH], [test x"$enable_module_ecdh" = x"yes"])
AM_CONDITIONAL([ENABLE_MODULE_RECOVERY], [test x"$enable_module_recovery" = x"yes"])
AM_CONDITIONAL([ENABLE_MODULE_EXTRAKEYS], [test x"$enable_module_extrakeys" = x"yes"])
AM_CONDITIONAL([ENABLE_MODULE_SCHNORRSIG], [test x"$enable_module_schnorrsig" = x"yes"])
AM_CONDITIONAL([ENABLE_MODULE_ELLSWIFT], [test x"$enable_module_ellswift" = x"yes"])
AM_CONDITIONAL([USE_EXTERNAL_ASM], [test x"$enable_external_asm" = x"yes"])
AM_CONDITIONAL([USE_ASM_ARM], [test x"$set_asm" = x"arm32"])
AM_CONDITIONAL([BUILD_WINDOWS], [test "$build_windows" = "yes"])
AC_SUBST(LIB_VERSION_CURRENT, _LIB_VERSION_CURRENT)
AC_SUBST(LIB_VERSION_REVISION, _LIB_VERSION_REVISION)
AC_SUBST(LIB_VERSION_AGE, _LIB_VERSION_AGE)

AC_OUTPUT

echo
echo "Build Options:"
echo "  with external callbacks = $enable_external_default_callbacks"
echo "  with benchmarks         = $enable_benchmark"
echo "  with tests              = $enable_tests"
echo "  with ctime tests        = $enable_ctime_tests"
echo "  with coverage           = $enable_coverage"
echo "  with examples           = $enable_examples"
echo "  module ecdh             = $enable_module_ecdh"
echo "  module recovery         = $enable_module_recovery"
echo "  module extrakeys        = $enable_module_extrakeys"
echo "  module schnorrsig       = $enable_module_schnorrsig"
echo "  module ellswift         = $enable_module_ellswift"
echo
echo "  asm                     = $set_asm"
echo "  ecmult window size      = $set_ecmult_window"
echo "  ecmult gen table size   = $set_ecmult_gen_kb KiB"
# Hide test-only options unless they're used.
if test x"$set_widemul" != xauto; then
echo "  wide multiplication     = $set_widemul"
fi
echo
echo "  valgrind                = $enable_valgrind"
echo "  CC                      = $CC"
echo "  CPPFLAGS                = $CPPFLAGS"
echo "  SECP_CFLAGS             = $SECP_CFLAGS"
echo "  CFLAGS                  = $CFLAGS"
echo "  LDFLAGS                 = $LDFLAGS"

if test x"$print_msan_notice" = x"yes"; then
  echo
  echo "Note:"
  echo "  MemorySanitizer detected, tried to add -fno-sanitize-memory-param-retval to SECP_CFLAGS"
  echo "  to avoid false positives in ctime_tests. Pass --disable-ctime-tests to avoid this."
fi

if test x"$enable_experimental" = x"yes"; then
  echo
  echo "WARNING: Experimental build"
  echo "  Experimental features do not have stable APIs or properties, and may not be safe for"
  echo "  production use."
fi