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configure: Check for -Werror causing failures when compiling tests

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Add support for checking whether test case code can compile without
warnings, by recompiling each successful test with -Werror. If the
-Werror version doesn't pass, we bail out. This gives us the same
level of visibility of warnings in test code as --enable-werror
provides for the main compile.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Peter Maydell 2012-07-18 15:10:28 +01:00 committed by Blue Swirl
parent 5fda043f9c
commit 8dc38a78d0
1 changed files with 28 additions and 4 deletions
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32
configure vendored
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@ -27,16 +27,40 @@ printf " '%s'" "$0" "$@" >> config.log
echo >> config.log
echo "#" >> config.log
do_cc() {
# Run the compiler, capturing its output to the log.
echo $cc "$@" >> config.log
$cc "$@" >> config.log 2>&1 || return $?
# Test passed. If this is an --enable-werror build, rerun
# the test with -Werror and bail out if it fails. This
# makes warning-generating-errors in configure test code
# obvious to developers.
if test "$werror" != "yes"; then
return 0
fi
# Don't bother rerunning the compile if we were already using -Werror
case "$*" in
*-Werror*)
return 0
;;
esac
echo $cc -Werror "$@" >> config.log
$cc -Werror "$@" >> config.log 2>&1 && return $?
echo "ERROR: configure test passed without -Werror but failed with -Werror."
echo "This is probably a bug in the configure script. The failing command"
echo "will be at the bottom of config.log."
echo "You can run configure with --disable-werror to bypass this check."
exit 1
}
compile_object() {
echo $cc $QEMU_CFLAGS -c -o $TMPO $TMPC >> config.log
$cc $QEMU_CFLAGS -c -o $TMPO $TMPC >> config.log 2>&1
do_cc $QEMU_CFLAGS -c -o $TMPO $TMPC
}
compile_prog() {
local_cflags="$1"
local_ldflags="$2"
echo $cc $QEMU_CFLAGS $local_cflags -o $TMPE $TMPC $LDFLAGS $local_ldflags >> config.log
$cc $QEMU_CFLAGS $local_cflags -o $TMPE $TMPC $LDFLAGS $local_ldflags >> config.log 2>&1
do_cc $QEMU_CFLAGS $local_cflags -o $TMPE $TMPC $LDFLAGS $local_ldflags
}
# symbolically link $1 to $2. Portable version of "ln -sf".