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configure.ac: properly evaluate ac_test_CFLAGS
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 ${CFLAGS+set}. Just test that ac_test_CFLAGS is not empty, to support both cases. Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
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@ -120,7 +120,7 @@ AC_SEARCH_LIBS([clock_gettime], [rt posix4],
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AC_CANONICAL_HOST
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# Store this value because ac_test_CFLAGS is overwritten by AC_PROG_CC
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if test "$ac_test_CFLAGS" != set ; then
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if ! test "$ac_test_CFLAGS" ; then
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bird_cflags_default=yes
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fi
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