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| author | David Herrmann <dh.herrmann@gmail.com> | 2015-02-24 17:49:48 +0100 |
|---|---|---|
| committer | David Herrmann <dh.herrmann@gmail.com> | 2015-02-24 17:49:48 +0100 |
| commit | 43bbf1acc8202de895e5449828a7b863c69fcc2f (patch) | |
| tree | 2956c196c1c970491c58fed4afe74c29d571cf69 /m4 | |
| parent | 72c3897f77a7352618ea76b880a6764f52d6327b (diff) | |
| download | systemd-43bbf1acc8202de895e5449828a7b863c69fcc2f.tar.gz | |
build: make sure to test for -Wflag instead of -Wno-flag
gcc does not support testing for negated warnings. See here for details:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63499
This patch changes CC_CHECK_FLAG_APPEND to always test for the non-negated
warnings.
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/attributes.m4 | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/m4/attributes.m4 b/m4/attributes.m4 index ac3c6624cd..97f094b07a 100644 --- a/m4/attributes.m4 +++ b/m4/attributes.m4 @@ -34,14 +34,15 @@ dnl this special exception to the GPL to apply to your modified version as dnl well. dnl Check if FLAG in ENV-VAR is supported by compiler and append it -dnl to WHERE-TO-APPEND variable +dnl to WHERE-TO-APPEND variable. Note that we invert -Wno-* checks to +dnl -W* as gcc cannot test for negated warnings. dnl CC_CHECK_FLAG_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG]) 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 $3'" + eval "AS_TR_SH([$2])='-Werror `echo "$3" | sed 's/^-Wno-/-W/'`'" AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) { return 0; } ])], [eval "AS_TR_SH([cc_cv_$2_$3])='yes'"], [eval "AS_TR_SH([cc_cv_$2_$3])='no'"]) |