gecko/build/autoconf/compiler-opts.m4
Nicholas Nethercote 85b9728d6c Bug 711895 - Tweak the warning options used for GCC builds (3rd attempt). r=waldo,derf,khuey,mhommey.
--HG--
extra : rebase_source : 20540c9b838ee3be6cb0847c1b90fdc3bd44059d
2012-03-21 22:21:16 -07:00

131 lines
5.1 KiB
Plaintext

dnl Add compiler specific options
AC_DEFUN([MOZ_COMPILER_OPTS],
[
if test "$CLANG_CXX"; then
## We disable return-type-c-linkage because jsval is defined as a C++ type but is
## returned by C functions. This is possible because we use knowledge about the ABI
## to typedef it to a C type with the same layout when the headers are included
## from C.
_WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -Wno-unknown-warning-option -Wno-return-type-c-linkage"
fi
if test "$GNU_CC"; then
CFLAGS="$CFLAGS -ffunction-sections -fdata-sections"
CXXFLAGS="$CXXFLAGS -ffunction-sections -fdata-sections"
fi
dnl ========================================================
dnl = Identical Code Folding
dnl ========================================================
MOZ_ARG_DISABLE_BOOL(icf,
[ --disable-icf Disable Identical Code Folding],
MOZ_DISABLE_ICF=1,
MOZ_DISABLE_ICF= )
if test "$GNU_CC" -a "$GCC_USE_GNU_LD" -a -z "$MOZ_DISABLE_ICF"; then
AC_CACHE_CHECK([whether the linker supports Identical Code Folding],
LD_SUPPORTS_ICF,
[echo 'int foo() {return 42;}' \
'int bar() {return 42;}' \
'int main() {return foo() - bar();}' > conftest.${ac_ext}
# If the linker supports ICF, foo and bar symbols will have
# the same address
if AC_TRY_COMMAND([${CC-cc} -o conftest${ac_exeext} $LDFLAGS -Wl,--icf=safe -ffunction-sections conftest.${ac_ext} $LIBS 1>&2]) &&
test -s conftest${ac_exeext} &&
objdump -t conftest${ac_exeext} | awk changequote(<<, >>)'{a[<<$>>6] = <<$>>1} END {if (a["foo"] && (a["foo"] != a["bar"])) { exit 1 }}'changequote([, ]); then
LD_SUPPORTS_ICF=yes
else
LD_SUPPORTS_ICF=no
fi
rm -rf conftest*])
if test "$LD_SUPPORTS_ICF" = yes; then
_SAVE_LDFLAGS="$LDFLAGS -Wl,--icf=safe"
LDFLAGS="$LDFLAGS -Wl,--icf=safe -Wl,--print-icf-sections"
AC_TRY_LINK([], [],
[LD_PRINT_ICF_SECTIONS=-Wl,--print-icf-sections],
[LD_PRINT_ICF_SECTIONS=])
AC_SUBST([LD_PRINT_ICF_SECTIONS])
LDFLAGS="$_SAVE_LDFLAGS"
fi
fi
dnl ========================================================
dnl = Automatically remove dead symbols
dnl ========================================================
if test "$GNU_CC" -a "$GCC_USE_GNU_LD" -a -n "$MOZ_DEBUG_FLAGS"; then
dnl See bug 670659
AC_CACHE_CHECK([whether removing dead symbols breaks debugging],
GC_SECTIONS_BREAKS_DEBUG_RANGES,
[echo 'int foo() {return 42;}' \
'int bar() {return 1;}' \
'int main() {return foo();}' > conftest.${ac_ext}
if AC_TRY_COMMAND([${CC-cc} -o conftest.${ac_objext} $CFLAGS $MOZ_DEBUG_FLAGS -c conftest.${ac_ext} 1>&2]) &&
AC_TRY_COMMAND([${CC-cc} -o conftest${ac_exeext} $LDFLAGS $MOZ_DEBUG_FLAGS -Wl,--gc-sections conftest.${ac_objext} $LIBS 1>&2]) &&
test -s conftest${ac_exeext} -a -s conftest.${ac_objext}; then
if test "`$PYTHON "$_topsrcdir"/build/autoconf/check_debug_ranges.py conftest.${ac_objext} conftest.${ac_ext}`" = \
"`$PYTHON "$_topsrcdir"/build/autoconf/check_debug_ranges.py conftest${ac_exeext} conftest.${ac_ext}`"; then
GC_SECTIONS_BREAKS_DEBUG_RANGES=no
else
GC_SECTIONS_BREAKS_DEBUG_RANGES=yes
fi
else
dnl We really don't expect to get here, but just in case
GC_SECTIONS_BREAKS_DEBUG_RANGES="no, but it's broken in some other way"
fi
rm -rf conftest*])
if test "$GC_SECTIONS_BREAKS_DEBUG_RANGES" = no; then
DSO_LDOPTS="$DSO_LDOPTS -Wl,--gc-sections"
fi
fi
])
dnl GCC and clang will fail if given an unknown warning option like -Wfoobar.
dnl But later versions won't fail if given an unknown negated warning option
dnl like -Wno-foobar. So when we are check for support of negated warning
dnl options, we actually test the positive form, but add the negated form to
dnl the flags variable.
AC_DEFUN([MOZ_C_SUPPORTS_WARNING],
[
AC_CACHE_CHECK(whether the C compiler supports $1$2, $3,
[
AC_LANG_SAVE
AC_LANG_C
_SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror -W$2"
AC_TRY_COMPILE([],
[return(0);],
$3="yes",
$3="no")
CFLAGS="$_SAVE_CFLAGS"
AC_LANG_RESTORE
])
if test "${$3}" = "yes"; then
_WARNINGS_CFLAGS="${_WARNINGS_CFLAGS} $1$2"
fi
])
AC_DEFUN([MOZ_CXX_SUPPORTS_WARNING],
[
AC_CACHE_CHECK(whether the C++ compiler supports $1$2, $3,
[
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
_SAVE_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -Werror -W$2"
AC_TRY_COMPILE([],
[return(0);],
$3="yes",
$3="no")
CXXFLAGS="$_SAVE_CXXFLAGS"
AC_LANG_RESTORE
])
if test "${$3}" = "yes"; then
_WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} $1$2"
fi
])