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| author | David Herrmann <dh.herrmann@gmail.com> | 2015-02-24 17:49:48 +0100 |
|---|---|---|
| committer | Lucas De Marchi <lucas.demarchi@intel.com> | 2015-02-24 22:45:17 -0300 |
| commit | 29ad07504badce1327007185a0efdae4a4509d69 (patch) | |
| tree | 9aaa476f1190d32cee17516d5f00c27ac59d1bce /m4 | |
| parent | a8f3aaebbe3cc39dc23f48d45865efa747b80ffa (diff) | |
| download | kmod-29ad07504badce1327007185a0efdae4a4509d69.tar.gz kmod-29ad07504badce1327007185a0efdae4a4509d69.tar.bz2 kmod-29ad07504badce1327007185a0efdae4a4509d69.zip | |
from systemd: 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 ab4b785..bfdb50f 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'"]) |