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Merge pull request #2541 from mgorny/append-flags-fix

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build-sys: Perform flag tests in context of existing flags
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2016-02-07 09:33:49 -05:00
commit dcd6ecf1e7
1 changed files with 1 additions and 1 deletions
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m4/attributes.m4
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@ -43,7 +43,7 @@ AC_DEFUN([CC_CHECK_FLAG_APPEND], [
AC_CACHE_CHECK([if $CC supports flag $3 in envvar $2],
AS_TR_SH([cc_cv_$2_$3]),
[eval "AS_TR_SH([cc_save_$2])='${$2}'"
eval "AS_TR_SH([$2])='-Werror `echo "$3" | sed 's/^-Wno-/-W/'`'"
eval "AS_TR_SH([$2])='${cc_save_$2} -Werror `echo "$3" | sed 's/^-Wno-/-W/'`'"
AC_LINK_IFELSE([AC_LANG_SOURCE(ifelse([$4], [],
[int main(void) { return 0; } ],
[$4]))],