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from systemd: build: make sure to test for -Wflag instead of -Wno-flag

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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.
This commit is contained in:
David Herrmann 2015-02-24 17:49:48 +01:00 committed by Lucas De Marchi
parent a8f3aaebbe
commit 29ad07504b
1 changed files with 3 additions and 2 deletions
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5
m4/attributes.m4
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@ -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'"])