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c++11: improve configure.

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* configure.ac, m4/ax_check_compile_flag.m4: Update from
Vaucanson 2.  (Thank you Akim.)
This commit is contained in:
Alexandre Duret-Lutz 2013-12-17 18:17:22 +01:00
parent ea6a34b0b4
commit 3a406dc3d7
2 changed files with 18 additions and 32 deletions
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6
m4/ax_check_compile_flag.m4
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@ -61,12 +61,10 @@ AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
AC_COMPILE_IFELSE([m4_default([$5], [AC_LANG_PROGRAM()])],
[AS_VAR_SET(CACHEVAR,[yes])],
[AS_VAR_SET(CACHEVAR,[no])])
_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
[m4_default([$2], :)],
[m4_default([$3], :)])
AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], [$2], [$3])
AS_VAR_POPDEF([CACHEVAR])dnl
])dnl AX_CHECK_COMPILE_FLAGS