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configure: Don't run configure tests with -Werror enabled

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Don't run configure tests with -Werror in the compiler flags. The idea
of -Werror is that it makes problems very obvious to developers, so
they get fixed quickly. However, when running configure tests, failures
due to -Werror are far from obvious -- they simply result in the test
quietly failing when it should have passed. Not using -Werror is in
line with recommended practice in the Autoconf world.

This commit is essentially backing out the changes in commit 417c9d72.
Instead we fix the problem that commit was trying to address in a
different way: we add -Werror only for the test of the nss headers,
with a comment that this is specifically intended to detect a bug
in some releases of nss.

We also have to clean up a bug in the smartcard test where it was
trying to include smartcard_cflags in the test compile flags: this
would always result in a failure with -Werror, because they include
an escaped "$(SRC_PATH)" which is only valid when used in the final
makefile.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Peter Maydell 2012-07-18 15:10:18 +01:00 committed by Blue Swirl
parent 06d71fa148
commit 6ca026cb37
1 changed files with 18 additions and 4 deletions
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22
configure vendored
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@ -1158,9 +1158,10 @@ gcc_flags="-Wold-style-declaration -Wold-style-definition -Wtype-limits"
gcc_flags="-Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers $gcc_flags"
gcc_flags="-Wmissing-include-dirs -Wempty-body -Wnested-externs $gcc_flags"
gcc_flags="-fstack-protector-all -Wendif-labels $gcc_flags"
if test "$werror" = "yes" ; then
gcc_flags="-Werror $gcc_flags"
fi
# Note that we do not add -Werror to gcc_flags here, because that would
# 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 > $TMPC << EOF
int main(void) { return 0; }
EOF
@ -2658,8 +2659,16 @@ EOF
smartcard_cflags="-I\$(SRC_PATH)/libcacard"
libcacard_libs="$($pkg_config --libs nss 2>/dev/null) $glib_libs"
libcacard_cflags="$($pkg_config --cflags nss 2>/dev/null) $glib_cflags"
test_cflags="$libcacard_cflags"
# The header files in nss < 3.13.3 have a bug which causes them to
# emit a warning. If we're going to compile QEMU with -Werror, then
# test that the headers don't have this bug. Otherwise we would pass
# the configure test but fail to compile QEMU later.
if test "$werror" = "yes"; then
test_cflags="-Werror $test_cflags"
fi
if $pkg_config --atleast-version=3.12.8 nss >/dev/null 2>&1 && \
compile_prog "$smartcard_cflags $libcacard_cflags" "$libcacard_libs"; then
compile_prog "$test_cflags" "$libcacard_libs"; then
smartcard_nss="yes"
QEMU_CFLAGS="$QEMU_CFLAGS $smartcard_cflags $libcacard_cflags"
libs_softmmu="$libcacard_libs $libs_softmmu"
@ -2936,6 +2945,11 @@ if test -z "$zero_malloc" ; then
fi
fi
# Now we've finished running tests it's OK to add -Werror to the compiler flags
if test "$werror" = "yes"; then
QEMU_CFLAGS="-Werror $QEMU_CFLAGS"
fi
if test "$solaris" = "no" ; then
if $ld --version 2>/dev/null | grep "GNU ld" >/dev/null 2>/dev/null ; then
LDFLAGS="-Wl,--warn-common $LDFLAGS"