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configure: factor out supported flag check

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Factor out the function that checks if a compiler
flag is supported or not.

Backports commit 93b25869228a3c0c632a6aa66624cc4e549ba14a from qemu
This commit is contained in:
John Snow 2018-03-09 11:49:31 -05:00 committed by Lioncash
parent d25e1a6216
commit 0aa640a303
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 17 additions and 10 deletions
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27
qemu/configure vendored
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@ -268,6 +268,12 @@ EOF
compile_object
}
write_c_skeleton() {
cat > $TMPC <<EOF
int main(void) { return 0; }
EOF
}
if check_define __linux__ ; then
targetos="Linux"
elif check_define _WIN32 ; then
@ -475,9 +481,7 @@ if test "$mingw32" = "yes" ; then
# enable C99/POSIX format strings (needs mingw32-runtime 3.15 or later)
QEMU_CFLAGS="-D__USE_MINGW_ANSI_STDIO=1 $QEMU_CFLAGS"
LIBS="-lwinmm -lws2_32 -liphlpapi $LIBS"
cat > $TMPC << EOF
int main(void) { return 0; }
EOF
write_c_skeleton;
if compile_prog "" "-liberty" ; then
LIBS="-liberty $LIBS"
fi
@ -705,16 +709,19 @@ gcc_flags="-Wno-string-plus-int $gcc_flags"
# enable it for all configure tests. If a configure test failed due
# to -Werror this would just silently disable some features,
# so it's too error prone.
cat > $TMPC << EOF
int main(void) { return 0; }
EOF
for flag in $gcc_flags; do
cc_has_warning_flag() {
write_c_skeleton;
# Use the positive sense of the flag when testing for -Wno-wombat
# support (gcc will happily accept the -Wno- form of unknown
# warning options).
optflag="$(echo $flag | sed -e 's/^-Wno-/-W/')"
if compile_prog "-Werror $optflag" "" ; then
QEMU_CFLAGS="$QEMU_CFLAGS $flag"
optflag="$(echo $1 | sed -e 's/^-Wno-/-W/')"
compile_prog "-Werror $optflag" ""
}
for flag in $gcc_flags; do
if cc_has_warning_flag $flag ; then
QEMU_CFLAGS="$QEMU_CFLAGS $flag"
fi
done