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44e7f02915
To facilitate porting over to glib, this rewrites the auto cleanup macros to use glib's equivalent. As a result it is now possible to use g_autoptr/VIR_AUTOPTR, and g_auto/VIR_AUTOCLEAN, g_autofree/VIR_AUTOFREE interchangably, regardless of which macros were used to declare the cleanup types. Within the scope of any single method, code must remain consistent using either GLib or Libvirt macros, never mixing both. New code must preferentially use the GLib macros, and old code will be converted incrementally. Reviewed-by: Ján Tomko <jtomko@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
265 lines
9.8 KiB
Plaintext
265 lines
9.8 KiB
Plaintext
dnl
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dnl Enable all known GCC compiler warnings, except for those
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dnl we can't yet cope with
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dnl
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AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
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dnl ******************************
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dnl More compiler warnings
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dnl ******************************
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LIBVIRT_ARG_ENABLE([WERROR], [Use -Werror (if supported)], [check])
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if test "$enable_werror" = "check"; then
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if test -d $srcdir/.git; then
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is_git_version=true
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enable_werror=yes
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else
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enable_werror=no
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fi
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fi
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# List of warnings that are not relevant / wanted
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# Don't care about C++ compiler compat
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dontwarn="$dontwarn -Wc++-compat"
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dontwarn="$dontwarn -Wabi"
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dontwarn="$dontwarn -Wdeprecated"
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# Don't care about ancient C standard compat
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dontwarn="$dontwarn -Wtraditional"
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# Don't care about ancient C standard compat
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dontwarn="$dontwarn -Wtraditional-conversion"
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# Ignore warnings in /usr/include
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dontwarn="$dontwarn -Wsystem-headers"
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# Happy for compiler to add struct padding
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dontwarn="$dontwarn -Wpadded"
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# GCC very confused with -O2
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dontwarn="$dontwarn -Wunreachable-code"
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# Too many to deal with
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dontwarn="$dontwarn -Wconversion"
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# Too many to deal with
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dontwarn="$dontwarn -Wsign-conversion"
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# GNULIB gettext.h violates
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dontwarn="$dontwarn -Wvla"
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# Many GNULIB header violations
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dontwarn="$dontwarn -Wundef"
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# Need to allow bad cast for execve()
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dontwarn="$dontwarn -Wcast-qual"
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# We need to use long long in many places
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dontwarn="$dontwarn -Wlong-long"
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# We allow manual list of all enum cases without default:
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dontwarn="$dontwarn -Wswitch-default"
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# Not a problem since we don't use -fstrict-overflow
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dontwarn="$dontwarn -Wstrict-overflow"
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# Not a problem since we don't use -funsafe-loop-optimizations
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dontwarn="$dontwarn -Wunsafe-loop-optimizations"
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# Things like virAsprintf mean we can't use this
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dontwarn="$dontwarn -Wformat-nonliteral"
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# Gnulib's stat-time.h violates this
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dontwarn="$dontwarn -Waggregate-return"
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# gcc 4.4.6 complains this is C++ only; gcc 4.7.0 implies this from -Wall
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dontwarn="$dontwarn -Wenum-compare"
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# gcc 5.1 -Wformat-signedness mishandles enums, not ready for prime time
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dontwarn="$dontwarn -Wformat-signedness"
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# Several conditionals expand the same on both branches
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# depending on the particular platform/architecture
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dontwarn="$dontwarn -Wduplicated-branches"
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# > This warning does not generally indicate that there is anything wrong
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# > with your code; it merely indicates that GCC's optimizers are unable
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# > to handle the code effectively.
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# Source: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
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dontwarn="$dontwarn -Wdisabled-optimization"
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# Various valid glib APIs/macros trigger this warning
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dontwarn="$dontwarn -Wbad-function-cast"
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# Broken in 6.0 and later
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69602
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AC_CACHE_CHECK([whether gcc gives bogus warnings for -Wlogical-op],
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[lv_cv_gcc_wlogical_op_equal_expr_broken], [
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save_CFLAGS="$CFLAGS"
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CFLAGS="-O2 -Wlogical-op -Werror"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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#define TEST1 1
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#define TEST2 TEST1
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]], [[
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int test = 0;
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return test == TEST1 || test == TEST2;]])],
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[lv_cv_gcc_wlogical_op_equal_expr_broken=no],
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[lv_cv_gcc_wlogical_op_equal_expr_broken=yes])
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CFLAGS="$save_CFLAGS"])
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AC_CACHE_CHECK([whether clang gives bogus warnings for -Wdouble-promotion],
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[lv_cv_clang_double_promotion_broken], [
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save_CFLAGS="$CFLAGS"
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CFLAGS="-O2 -Wdouble-promotion -Werror"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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#include <math.h>
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]], [[
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float f = 0.0;
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return isnan(f);]])],
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[lv_cv_clang_double_promotion_broken=no],
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[lv_cv_clang_double_promotion_broken=yes])
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CFLAGS="$save_CFLAGS"])
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if test "$lv_cv_clang_double_promotion_broken" = "yes";
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then
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dontwarn="$dontwarn -Wdouble-promotion"
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fi
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# Clang complains about unused static inline functions
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# which are common with G_DEFINE_AUTOPTR_CLEANUP_FUNC
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AC_CACHE_CHECK([whether clang gives bogus warnings for -Wunused-function],
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[lv_cv_clang_unused_function_broken], [
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save_CFLAGS="$CFLAGS"
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CFLAGS="-Wunused-function -Werror"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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static inline void foo(void) {}
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]], [[
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return 0]])],
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[lv_cv_clang_unused_function_broken=no],
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[lv_cv_clang_unused_function_broken=yes])
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CFLAGS="$save_CFLAGS"])
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# We might fundamentally need some of these disabled forever, but
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# ideally we'd turn many of them on
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dontwarn="$dontwarn -Wfloat-equal"
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dontwarn="$dontwarn -Wdeclaration-after-statement"
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dontwarn="$dontwarn -Wpacked"
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dontwarn="$dontwarn -Wunused-macros"
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dontwarn="$dontwarn -Woverlength-strings"
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dontwarn="$dontwarn -Wstack-protector"
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# Get all possible GCC warnings
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gl_MANYWARN_ALL_GCC([maybewarn])
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# Remove the ones we don't want, blacklisted earlier
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gl_MANYWARN_COMPLEMENT([wantwarn], [$maybewarn], [$dontwarn])
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# -Wunused-functin is implied by -Wall we must turn it
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# off explicitly.
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if test "$lv_cv_clang_unused_function_broken" = "yes";
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then
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wantwarn="$wantwarn -Wno-unused-function"
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fi
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# GNULIB uses '-W' (aka -Wextra) which includes a bunch of stuff.
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# Unfortunately, this means you can't simply use '-Wsign-compare'
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# with gl_MANYWARN_COMPLEMENT
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# So we have -W enabled, and then have to explicitly turn off...
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wantwarn="$wantwarn -Wno-sign-compare"
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# We do "bad" function casts all the time for event callbacks
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wantwarn="$wantwarn -Wno-cast-function-type"
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# CLang incorrectly complains about dup typedefs win gnu99 mode
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# so use this CLang-specific arg to keep it quiet
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wantwarn="$wantwarn -Wno-typedef-redefinition"
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# GNULIB expects this to be part of -Wc++-compat, but we turn
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# that one off, so we need to manually enable this again
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wantwarn="$wantwarn -Wjump-misses-init"
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# GNULIB explicitly filters it out, preferring -Wswitch
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# but that doesn't report missing enums if a default:
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# is present.
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wantwarn="$wantwarn -Wswitch-enum"
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# GNULIB turns on -Wformat=2 which implies -Wformat-nonliteral,
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# so we need to manually re-exclude it.
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wantwarn="$wantwarn -Wno-format-nonliteral"
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# -Wformat enables this by default, and we should keep it,
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# but need to rewrite various areas of code first
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wantwarn="$wantwarn -Wno-format-truncation"
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# This should be < 256 really. Currently we're down to 4096,
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# but using 1024 bytes sized buffers (mostly for virStrerror)
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# stops us from going down further
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gl_WARN_ADD([-Wframe-larger-than=4096], [STRICT_FRAME_LIMIT_CFLAGS])
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gl_WARN_ADD([-Wframe-larger-than=32768], [RELAXED_FRAME_LIMIT_CFLAGS])
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# Extra special flags
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dnl -fstack-protector stuff passes gl_WARN_ADD with gcc
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dnl on Mingw32, but fails when actually used
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case $host in
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aarch64-*-*)
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dnl "error: -fstack-protector not supported for this target [-Werror]"
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;;
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*-*-linux*)
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dnl Prefer -fstack-protector-strong if it's available.
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dnl There doesn't seem to be great overhead in adding
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dnl -fstack-protector-all instead of -fstack-protector.
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dnl
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dnl We also don't need ssp-buffer-size with -all or -strong,
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dnl since functions are protected regardless of buffer size.
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dnl wantwarn="$wantwarn --param=ssp-buffer-size=4"
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wantwarn="$wantwarn -fstack-protector-strong"
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;;
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*-*-freebsd*)
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dnl FreeBSD ships old gcc 4.2.1 which doesn't handle
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dnl -fstack-protector-all well
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wantwarn="$wantwarn -fstack-protector"
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wantwarn="$wantwarn -Wno-unused-command-line-argument"
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;;
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esac
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wantwarn="$wantwarn -fexceptions"
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wantwarn="$wantwarn -fasynchronous-unwind-tables"
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# Need -fipa-pure-const in order to make -Wsuggest-attribute=pure
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# fire even without -O.
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wantwarn="$wantwarn -fipa-pure-const"
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# We should eventually enable this, but right now there are at
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# least 75 functions triggering warnings.
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wantwarn="$wantwarn -Wno-suggest-attribute=pure"
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wantwarn="$wantwarn -Wno-suggest-attribute=const"
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if test "$enable_werror" = "yes"
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then
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wantwarn="$wantwarn -Werror"
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fi
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# Request the gnu99 standard which is the best choice with
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# gcc 4.8.0. Not a warning flag, but the probing mechanism
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# is convenient
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wantwarn="$wantwarn -std=gnu99"
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# Check for $CC support of each warning
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for w in $wantwarn; do
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gl_WARN_ADD([$w])
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done
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case $host in
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*-*-linux*)
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dnl Fall back to -fstack-protector-all if -strong is not available
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case $WARN_CFLAGS in
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*-fstack-protector-strong*)
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;;
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*)
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gl_WARN_ADD([-fstack-protector-all])
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;;
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esac
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;;
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esac
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case $WARN_CFLAGS in
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*-Wsuggest-attribute=format*)
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AC_DEFINE([HAVE_SUGGEST_ATTRIBUTE_FORMAT], [1], [Whether -Wsuggest-attribute=format works])
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;;
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esac
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# Silence certain warnings in gnulib, and use improved glibc headers
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AC_DEFINE([lint], [1],
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[Define to 1 if the compiler is checking for lint.])
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AH_VERBATIM([FORTIFY_SOURCE],
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[/* Enable compile-time and run-time bounds-checking, and some warnings,
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without upsetting newer glibc. */
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#if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__
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# define _FORTIFY_SOURCE 2
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#endif
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])
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if test "$gl_cv_warn_c__Wlogical_op" = yes &&
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test "$lv_cv_gcc_wlogical_op_equal_expr_broken" = yes; then
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AC_DEFINE_UNQUOTED([BROKEN_GCC_WLOGICALOP_EQUAL_EXPR], 1,
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[Define to 1 if gcc -Wlogical-op reports false positive 'or' equal expr])
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fi
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])
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