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build: set -Werror when checking whether a -W<warning> option works

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Otherwise the check is effectively a no-op and unknown options still get
turned on. This results in unknown warnings when build without
--with-extra-warnings=error:

  warning: unknown warning option '-Wno-unused-but-set-variable'; did you mean '-Wno-unused-const-variable'? [-Wunknown-warning-option]
This commit is contained in:
Lubomir Rintel 2015-09-29 13:54:21 +02:00
parent edec77fba4
commit b38bc15747
1 changed files with 1 additions and 1 deletions
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2
m4/compiler_warnings.m4
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@ -56,7 +56,7 @@ if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
-Wpointer-arith -Winit-self \
-Wmissing-include-dirs -Wno-pragmas; do
dnl GCC 4.4 does not warn when checking for -Wno-* flags (https://gcc.gnu.org/wiki/FAQ#wnowarning)
CFLAGS="$CFLAGS_MORE_WARNINGS $(printf '%s' "$option" | sed 's/^-Wno-/-W/') $CFLAGS_SAVED"
CFLAGS="-Werror $CFLAGS_MORE_WARNINGS $(printf '%s' "$option" | sed 's/^-Wno-/-W/') $CFLAGS_SAVED"
AC_MSG_CHECKING([whether compiler understands $option])
AC_TRY_COMPILE([], [],
has_option=yes,