libvirt/m4/virt-compile-warnings.m4
Ján Tomko 4b91dc24d1 Fix build with clang
Partially revert cdd703f's revert of c163410, as linking with clang
with --param=ssp-buffer-size=4 still fails with:
"argument unused during compilation".
2013-07-04 11:35:59 +02:00

236 lines
8.9 KiB
Plaintext

dnl
dnl Enable all known GCC compiler warnings, except for those
dnl we can't yet cope with
dnl
AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
dnl ******************************
dnl More compiler warnings
dnl ******************************
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"
# Gnulib's stat-time.h violates this
dontwarn="$dontwarn -Waggregate-return"
# gcc 4.4.6 complains this is C++ only; gcc 4.7.0 implies this from -Wall
dontwarn="$dontwarn -Wenum-compare"
# gcc 4.2 treats attribute(format) as an implicit attribute(nonnull),
# which triggers spurious warnings for our usage
AC_CACHE_CHECK([whether gcc -Wformat allows NULL strings],
[lv_cv_gcc_wformat_null_works], [
save_CFLAGS=$CFLAGS
CFLAGS='-Wunknown-pragmas -Werror -Wformat'
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <stddef.h>
static __attribute__ ((__format__ (__printf__, 1, 2))) int
foo (const char *fmt, ...) { return !fmt; }
]], [[
return foo(NULL);
]])],
[lv_cv_gcc_wformat_null_works=yes],
[lv_cv_gcc_wformat_null_works=no])
CFLAGS=$save_CFLAGS])
# Gnulib uses '#pragma GCC diagnostic push' to silence some
# warnings, but older gcc doesn't support this.
AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
[lv_cv_gcc_pragma_push_works], [
save_CFLAGS=$CFLAGS
CFLAGS='-Wunknown-pragmas -Werror'
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#pragma GCC diagnostic push
#pragma GCC diagnostic pop
]])],
[lv_cv_gcc_pragma_push_works=yes],
[lv_cv_gcc_pragma_push_works=no])
CFLAGS=$save_CFLAGS])
if test $lv_cv_gcc_pragma_push_works = no; then
dontwarn="$dontwarn -Wmissing-prototypes"
dontwarn="$dontwarn -Wmissing-declarations"
dontwarn="$dontwarn -Wcast-align"
else
AC_DEFINE_UNQUOTED([WORKING_PRAGMA_PUSH], 1,
[Define to 1 if gcc supports pragma push/pop])
fi
dnl Check whether strchr(s, char variable) causes a bogus compile
dnl warning, which is the case with GCC < 4.6 on some glibc
AC_CACHE_CHECK([whether GCC -Wlogical-op gives bogus warnings],
[lv_cv_gcc_wlogical_op_broken], [
save_CFLAGS="$CFLAGS"
CFLAGS="-O2 -Wlogical-op -Werror"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <string.h>
]], [[
const char *haystack;
char needle;
return strchr(haystack, needle) == haystack;]])],
[lv_cv_gcc_wlogical_op_broken=no],
[lv_cv_gcc_wlogical_op_broken=yes])
CFLAGS="$save_CFLAGS"])
# 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. Also, older gcc 4.2
# added an implied ATTRIBUTE_NONNULL on any parameter marked
# ATTRIBUTE_FMT_PRINT, which causes -Wformat failure on our
# intentional use of virReportError(code, NULL).
gl_WARN_ADD([-Wno-format-nonliteral])
if test $lv_cv_gcc_wformat_null_works = no; then
gl_WARN_ADD([-Wno-format])
fi
# 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.])
AH_VERBATIM([FORTIFY_SOURCE],
[/* Enable compile-time and run-time bounds-checking, and some warnings,
without upsetting newer glibc. */
#if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__
# define _FORTIFY_SOURCE 2
#endif
])
# Extra special flags
dnl -fstack-protector stuff passes gl_WARN_ADD with gcc
dnl on Mingw32, but fails when actually used
case $host in
*-*-linux*)
dnl Fedora only uses -fstack-protector, but doesn't seem to
dnl be great overhead in adding -fstack-protector-all instead
dnl gl_WARN_ADD([-fstack-protector])
gl_WARN_ADD([-fstack-protector-all])
gl_WARN_ADD([--param=ssp-buffer-size=4])
dnl Even though it supports it, clang complains about
dnl use of --param=ssp-buffer-size=4 unless used with
dnl the -c arg. It doesn't like it when used with args
dnl that just link together .o files. Unfortunately
dnl we can't avoid that with automake, so we must turn
dnl off the following clang specific warning
gl_WARN_ADD([-Wno-unused-command-line-argument])
;;
*-*-freebsd*)
dnl FreeBSD ships old gcc 4.2.1 which doesn't handle
dnl -fstack-protector-all well
gl_WARN_ADD([-fstack-protector])
gl_WARN_ADD([-Wno-unused-command-line-argument])
;;
esac
gl_WARN_ADD([-fexceptions])
gl_WARN_ADD([-fasynchronous-unwind-tables])
gl_WARN_ADD([-fdiagnostics-show-option])
gl_WARN_ADD([-funit-at-a-time])
# Need -fipa-pure-const in order to make -Wsuggest-attribute=pure
# fire even without -O.
gl_WARN_ADD([-fipa-pure-const])
# We should eventually enable this, but right now there are at
# least 75 functions triggering warnings.
gl_WARN_ADD([-Wno-suggest-attribute=pure])
gl_WARN_ADD([-Wno-suggest-attribute=const])
if test "$set_werror" = "yes"
then
gl_WARN_ADD([-Werror])
fi
dnl Needed to keep compile quiet on python 2.4
save_WARN_CFLAGS=$WARN_CFLAGS
WARN_CFLAGS=
gl_WARN_ADD([-Wno-redundant-decls])
WARN_PYTHON_CFLAGS=$WARN_CFLAGS
AC_SUBST(WARN_PYTHON_CFLAGS)
WARN_CFLAGS=$save_WARN_CFLAGS
if test "$gl_cv_warn_c__Wlogical_op" = yes &&
test "$lv_cv_gcc_wlogical_op_broken" = yes; then
AC_DEFINE_UNQUOTED([BROKEN_GCC_WLOGICALOP], 1,
[Define to 1 if gcc -Wlogical-op reports false positives on strchr])
fi
])