diff options
Diffstat (limited to 'm4/virt-compile-warnings.m4')
| -rw-r--r-- | m4/virt-compile-warnings.m4 | 258 |
1 files changed, 126 insertions, 132 deletions
diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4 index 3a428c32b..5527bff50 100644 --- a/m4/virt-compile-warnings.m4 +++ b/m4/virt-compile-warnings.m4 @@ -7,139 +7,133 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[ dnl More compiler warnings dnl ****************************** - AC_ARG_ENABLE(compile-warnings, - [AC_HELP_STRING([--enable-compile-warnings=@<:@no/yes/error@:>@], - [Turn on compiler warnings])],, - [enable_compile_warnings="m4_default([$1],[yes])"]) - - case "$enable_compile_warnings" in - no) - try_compiler_flags="" - ;; - yes|minimum|maximum|error) - - # List of warnings that are not relevant / wanted - - # Don't care about C++ compiler compat - dontwarn="$dontwarn -Wc++-compat" - dontwarn="$dontwarn -Wabi" - dontwarn="$dontwarn -Wdeprecated" - # Don't care about ancient C standard compat - dontwarn="$dontwarn -Wtraditional" - # Don't care about ancient C standard compat - dontwarn="$dontwarn -Wtraditional-conversion" - # Ignore warnings in /usr/include - dontwarn="$dontwarn -Wsystem-headers" - # Happy for compiler to add struct padding - dontwarn="$dontwarn -Wpadded" - # GCC very confused with -O2 - dontwarn="$dontwarn -Wunreachable-code" - # Too many to deal with - dontwarn="$dontwarn -Wconversion" - # Too many to deal with - dontwarn="$dontwarn -Wsign-conversion" - # GNULIB gettext.h violates - dontwarn="$dontwarn -Wvla" - # Many GNULIB header violations - dontwarn="$dontwarn -Wundef" - # Need to allow bad cast for execve() - dontwarn="$dontwarn -Wcast-qual" - # We need to use long long in many places - dontwarn="$dontwarn -Wlong-long" - # We allow manual list of all enum cases without default: - dontwarn="$dontwarn -Wswitch-default" - # We allow optional default: instead of listing all enum values - dontwarn="$dontwarn -Wswitch-enum" - # Not a problem since we don't use -fstrict-overflow - dontwarn="$dontwarn -Wstrict-overflow" - # Not a problem since we don't use -funsafe-loop-optimizations - dontwarn="$dontwarn -Wunsafe-loop-optimizations" - # Things like virAsprintf mean we can't use this - dontwarn="$dontwarn -Wformat-nonliteral" - - # We might fundamentally need some of these disabled forever, but - # ideally we'd turn many of them on - dontwarn="$dontwarn -Wfloat-equal" - dontwarn="$dontwarn -Wdeclaration-after-statement" - dontwarn="$dontwarn -Wcast-qual" - dontwarn="$dontwarn -Wconversion" - dontwarn="$dontwarn -Wsign-conversion" - dontwarn="$dontwarn -Wpacked" - dontwarn="$dontwarn -Wunused-macros" - dontwarn="$dontwarn -Woverlength-strings" - dontwarn="$dontwarn -Wstack-protector" - - # Get all possible GCC warnings - gl_MANYWARN_ALL_GCC([maybewarn]) - - # Remove the ones we don't want, blacklisted earlier - gl_MANYWARN_COMPLEMENT([wantwarn], [$maybewarn], [$dontwarn]) - - # Check for $CC support of each warning - for w in $wantwarn; do - gl_WARN_ADD([$w]) - done - - # GNULIB uses '-W' (aka -Wextra) which includes a bunch of stuff. - # Unfortunately, this means you can't simply use '-Wsign-compare' - # with gl_MANYWARN_COMPLEMENT - # So we have -W enabled, and then have to explicitly turn off... - gl_WARN_ADD([-Wno-sign-compare]) - - # GNULIB expects this to be part of -Wc++-compat, but we turn - # that one off, so we need to manually enable this again - gl_WARN_ADD([-Wjump-misses-init]) - - # GNULIB turns on -Wformat=2 which implies -Wformat-nonliteral, - # so we need to manually re-exclude it. - gl_WARN_ADD([-Wno-format-nonliteral]) - - # This should be < 256 really. Currently we're down to 4096, - # but using 1024 bytes sized buffers (mostly for virStrerror) - # stops us from going down further - gl_WARN_ADD([-Wframe-larger-than=4096]) - dnl gl_WARN_ADD([-Wframe-larger-than=256]) - - # Silence certain warnings in gnulib, and use improved glibc headers - AC_DEFINE([lint], [1], - [Define to 1 if the compiler is checking for lint.]) - AC_DEFINE([_FORTIFY_SOURCE], [2], - [enable compile-time and run-time bounds-checking, and some warnings]) - - # Extra special flags - dnl -fstack-protector stuff passes gl_WARN_ADD with gcc - dnl on Mingw32, but fails when actually used - case $host in - *-*-linux*) - dnl Fedora only uses -fstack-protector, but doesn't seem to - dnl be great overhead in adding -fstack-protector-all instead - dnl gl_WARN_ADD([-fstack-protector]) - gl_WARN_ADD([-fstack-protector-all]) - gl_WARN_ADD([--param=ssp-buffer-size=4]) - ;; - esac - gl_WARN_ADD([-fexceptions]) - gl_WARN_ADD([-fasynchronous-unwind-tables]) - gl_WARN_ADD([-fdiagnostics-show-option]) - gl_WARN_ADD([-funit-at-a-time]) - - # Need -fipa-pure-const in order to make -Wsuggest-attribute=pure - # fire even without -O. - gl_WARN_ADD([-fipa-pure-const]) - # We should eventually enable this, but right now there are at - # least 75 functions triggering warnings. - gl_WARN_ADD([-Wno-suggest-attribute=pure]) - gl_WARN_ADD([-Wno-suggest-attribute=const]) - - if test "$enable_compile_warnings" = "error" - then - gl_WARN_ADD([-Werror]) - fi - ;; - *) - AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --enable-compile-warnings) - ;; + AC_ARG_ENABLE([werror], + AS_HELP_STRING([--enable-werror], [Use -Werror (if supported)]), + [set_werror="$enableval"], + [if test -d $srcdir/.git; then + is_git_version=true + set_werror=yes + else + set_werror=no + fi]) + + # List of warnings that are not relevant / wanted + + # Don't care about C++ compiler compat + dontwarn="$dontwarn -Wc++-compat" + dontwarn="$dontwarn -Wabi" + dontwarn="$dontwarn -Wdeprecated" + # Don't care about ancient C standard compat + dontwarn="$dontwarn -Wtraditional" + # Don't care about ancient C standard compat + dontwarn="$dontwarn -Wtraditional-conversion" + # Ignore warnings in /usr/include + dontwarn="$dontwarn -Wsystem-headers" + # Happy for compiler to add struct padding + dontwarn="$dontwarn -Wpadded" + # GCC very confused with -O2 + dontwarn="$dontwarn -Wunreachable-code" + # Too many to deal with + dontwarn="$dontwarn -Wconversion" + # Too many to deal with + dontwarn="$dontwarn -Wsign-conversion" + # GNULIB gettext.h violates + dontwarn="$dontwarn -Wvla" + # Many GNULIB header violations + dontwarn="$dontwarn -Wundef" + # Need to allow bad cast for execve() + dontwarn="$dontwarn -Wcast-qual" + # We need to use long long in many places + dontwarn="$dontwarn -Wlong-long" + # We allow manual list of all enum cases without default: + dontwarn="$dontwarn -Wswitch-default" + # We allow optional default: instead of listing all enum values + dontwarn="$dontwarn -Wswitch-enum" + # Not a problem since we don't use -fstrict-overflow + dontwarn="$dontwarn -Wstrict-overflow" + # Not a problem since we don't use -funsafe-loop-optimizations + dontwarn="$dontwarn -Wunsafe-loop-optimizations" + # Things like virAsprintf mean we can't use this + dontwarn="$dontwarn -Wformat-nonliteral" + + # We might fundamentally need some of these disabled forever, but + # ideally we'd turn many of them on + dontwarn="$dontwarn -Wfloat-equal" + dontwarn="$dontwarn -Wdeclaration-after-statement" + dontwarn="$dontwarn -Wcast-qual" + dontwarn="$dontwarn -Wconversion" + dontwarn="$dontwarn -Wsign-conversion" + dontwarn="$dontwarn -Wpacked" + dontwarn="$dontwarn -Wunused-macros" + dontwarn="$dontwarn -Woverlength-strings" + dontwarn="$dontwarn -Wstack-protector" + + # Get all possible GCC warnings + gl_MANYWARN_ALL_GCC([maybewarn]) + + # Remove the ones we don't want, blacklisted earlier + gl_MANYWARN_COMPLEMENT([wantwarn], [$maybewarn], [$dontwarn]) + + # Check for $CC support of each warning + for w in $wantwarn; do + gl_WARN_ADD([$w]) + done + + # GNULIB uses '-W' (aka -Wextra) which includes a bunch of stuff. + # Unfortunately, this means you can't simply use '-Wsign-compare' + # with gl_MANYWARN_COMPLEMENT + # So we have -W enabled, and then have to explicitly turn off... + gl_WARN_ADD([-Wno-sign-compare]) + + # GNULIB expects this to be part of -Wc++-compat, but we turn + # that one off, so we need to manually enable this again + gl_WARN_ADD([-Wjump-misses-init]) + + # GNULIB turns on -Wformat=2 which implies -Wformat-nonliteral, + # so we need to manually re-exclude it. + gl_WARN_ADD([-Wno-format-nonliteral]) + + # This should be < 256 really. Currently we're down to 4096, + # but using 1024 bytes sized buffers (mostly for virStrerror) + # stops us from going down further + gl_WARN_ADD([-Wframe-larger-than=4096]) + dnl gl_WARN_ADD([-Wframe-larger-than=256]) + + # Silence certain warnings in gnulib, and use improved glibc headers + AC_DEFINE([lint], [1], + [Define to 1 if the compiler is checking for lint.]) + AC_DEFINE([_FORTIFY_SOURCE], [2], + [enable compile-time and run-time bounds-checking, and some warnings]) + + # Extra special flags + dnl -fstack-protector stuff passes gl_WARN_ADD with gcc + dnl on Mingw32, but fails when actually used + case $host in + *-*-linux*) + dnl Fedora only uses -fstack-protector, but doesn't seem to + dnl be great overhead in adding -fstack-protector-all instead + dnl gl_WARN_ADD([-fstack-protector]) + gl_WARN_ADD([-fstack-protector-all]) + gl_WARN_ADD([--param=ssp-buffer-size=4]) + ;; esac + gl_WARN_ADD([-fexceptions]) + gl_WARN_ADD([-fasynchronous-unwind-tables]) + gl_WARN_ADD([-fdiagnostics-show-option]) + gl_WARN_ADD([-funit-at-a-time]) + + # Need -fipa-pure-const in order to make -Wsuggest-attribute=pure + # fire even without -O. + gl_WARN_ADD([-fipa-pure-const]) + # We should eventually enable this, but right now there are at + # least 75 functions triggering warnings. + gl_WARN_ADD([-Wno-suggest-attribute=pure]) + gl_WARN_ADD([-Wno-suggest-attribute=const]) + + if test "$set_werror" = "yes" + then + gl_WARN_ADD([-Werror]) + fi WARN_LDFLAGS=$WARN_CFLAGS AC_SUBST([WARN_CFLAGS]) |