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configure: use -Wwombat to test whether gcc recognizes -Wno-wombat

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gcc will silently accept unrecognized -Wno-wombat warning suppression
options (it only mentions them if it has to print a compiler warning
for some other reason). Since we already run a check for whether gcc
recognizes the warning options we use, we can easily make this use
the positive sense of the option when checking for support for the
suppression option. This doesn't have any effect except that it avoids
gcc emitting extra messages about unrecognized command line options
when it is printing other warning messages.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Igor Mitsyanko <i.mitsyanko@samsung.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Peter Maydell 2012-10-27 22:19:07 +01:00 committed by Blue Swirl
parent e7d51b3450
commit a1d29d6c1d
1 changed files with 5 additions and 1 deletions
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6
configure vendored
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@ -1169,7 +1169,11 @@ cat > $TMPC << EOF
int main(void) { return 0; }
EOF
for flag in $gcc_flags; do
if compile_prog "-Werror $flag" "" ; then
# Use the positive sense of the flag when testing for -Wno-wombat
# support (gcc will happily accept the -Wno- form of unknown
# warning options).
optflag="$(echo $flag | sed -e 's/^-Wno-/-W/')"
if compile_prog "-Werror $optflag" "" ; then
QEMU_CFLAGS="$QEMU_CFLAGS $flag"
fi
done