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Diffstat (limited to 'm4/attributes.m4')
| -rw-r--r-- | m4/attributes.m4 | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/m4/attributes.m4 b/m4/attributes.m4 index 23b5f2ee4..f781429f7 100644 --- a/m4/attributes.m4 +++ b/m4/attributes.m4 @@ -50,6 +50,24 @@ AC_DEFUN([CC_CHECK_CFLAGS], [ fi ]) +AC_DEFUN([CC_CHECK_LDFLAGS], [ + AC_CACHE_CHECK([if $CC supports $1 flag], + AS_TR_SH([cc_cv_ldflags_$1]), + [ac_save_LDFLAGS="$LDFLAGS" + LDFLAGS="$LDFLAGS $1" + AC_LINK_IFELSE([int a;], + [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"], + [eval "AS_TR_SH([cc_cv_ldflags_$1])="]) + LDFLAGS="$ac_save_LDFLAGS" + ]) + + if eval test [x$]AS_TR_SH([cc_cv_ldflags_$1]) = xyes; then + ifelse([$2], , [:], [$2]) + else + ifelse([$3], , [:], [$3]) + fi +]) + dnl Check for a -Werror flag or equivalent. -Werror is the GCC dnl and ICC flag that tells the compiler to treat all the warnings dnl as fatal. We usually need this option to make sure that some |