aboutsummaryrefslogtreecommitdiff
path: root/build-aux/m4/ax_check_preproc_flag.m4
diff options
context:
space:
mode:
authorfanquake <fanquake@gmail.com>2016-03-19 15:24:00 +0800
committerfanquake <fanquake@gmail.com>2016-03-19 15:24:00 +0800
commitcf5c786fc3244b6aedcc4a2f839f5248f95fafa1 (patch)
tree5cdc61abe600b62b3192afe23e52aeac647aca0a /build-aux/m4/ax_check_preproc_flag.m4
parentf034bced269c4859809d320dcfbdc4b008191b85 (diff)
[build-aux] Update Boost & check macros to latest serials
Diffstat (limited to 'build-aux/m4/ax_check_preproc_flag.m4')
-rw-r--r--build-aux/m4/ax_check_preproc_flag.m412
1 files changed, 7 insertions, 5 deletions
diff --git a/build-aux/m4/ax_check_preproc_flag.m4 b/build-aux/m4/ax_check_preproc_flag.m4
index b1cfef6b86..ca1d5ee2b6 100644
--- a/build-aux/m4/ax_check_preproc_flag.m4
+++ b/build-aux/m4/ax_check_preproc_flag.m4
@@ -4,7 +4,7 @@
#
# SYNOPSIS
#
-# AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
+# AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
#
# DESCRIPTION
#
@@ -19,6 +19,8 @@
# "CPPFLAGS EXTRA-FLAGS FLAG". This can for example be used to force the
# preprocessor to issue an error when a bad flag is given.
#
+# INPUT gives an alternative input source to AC_PREPROC_IFELSE.
+#
# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
# macro in sync with AX_CHECK_{COMPILE,LINK}_FLAG.
#
@@ -53,19 +55,19 @@
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
-#serial 2
+#serial 4
AC_DEFUN([AX_CHECK_PREPROC_FLAG],
-[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]cppflags_$4_$1])dnl
AC_CACHE_CHECK([whether _AC_LANG preprocessor accepts $1], CACHEVAR, [
ax_check_save_flags=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $4 $1"
- AC_PREPROC_IFELSE([AC_LANG_PROGRAM()],
+ AC_PREPROC_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
[AS_VAR_SET(CACHEVAR,[yes])],
[AS_VAR_SET(CACHEVAR,[no])])
CPPFLAGS=$ax_check_save_flags])
-AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
+AS_VAR_IF(CACHEVAR,yes,
[m4_default([$2], :)],
[m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl