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configure.ac: properly evaluate ac_test_CFLAGS

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Since autoconf 2.69 and
https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=76754e04fce5f6a7701bec57b057020585df2ae3
ac_test_CFLAGS is set to ${CFLAGS+y} instead of ${CFLAGS+set}.

Just test that ac_test_CFLAGS is not empty, to support both cases.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
This commit is contained in:
Fabrice Fontaine 2024-08-27 14:54:07 +02:00 committed by Ondrej Zajicek
parent acbdc29d57
commit 404e82616d
1 changed files with 1 additions and 1 deletions
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2
configure.ac
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@ -120,7 +120,7 @@ AC_SEARCH_LIBS([clock_gettime], [rt posix4],
AC_CANONICAL_HOST
# Store this value because ac_test_CFLAGS is overwritten by AC_PROG_CC
if test "$ac_test_CFLAGS" != set ; then
if ! test "$ac_test_CFLAGS" ; then
bird_cflags_default=yes
fi