2012-02-16 06:53:08 -08:00
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dnl Add compiler specific options
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AC_DEFUN([MOZ_COMPILER_OPTS],
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[
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if test "$CLANG_CXX"; then
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## We disable return-type-c-linkage because jsval is defined as a C++ type but is
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## returned by C functions. This is possible because we use knowledge about the ABI
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## to typedef it to a C type with the same layout when the headers are included
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## from C.
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2012-02-29 07:20:42 -08:00
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_WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -Wno-unknown-warning-option -Wno-return-type-c-linkage"
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2012-02-16 06:53:08 -08:00
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fi
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2012-02-27 07:35:44 -08:00
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if test "$GNU_CC"; then
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CFLAGS="$CFLAGS -ffunction-sections -fdata-sections"
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CXXFLAGS="$CXXFLAGS -ffunction-sections -fdata-sections"
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fi
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dnl ========================================================
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dnl = Identical Code Folding
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dnl ========================================================
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MOZ_ARG_DISABLE_BOOL(icf,
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[ --disable-icf Disable Identical Code Folding],
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MOZ_DISABLE_ICF=1,
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MOZ_DISABLE_ICF= )
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if test "$GNU_CC" -a "$GCC_USE_GNU_LD" -a -z "$MOZ_DISABLE_ICF"; then
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AC_CACHE_CHECK([whether the linker supports Identical Code Folding],
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LD_SUPPORTS_ICF,
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[echo 'int foo() {return 42;}' \
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'int bar() {return 42;}' \
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'int main() {return foo() - bar();}' > conftest.${ac_ext}
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# If the linker supports ICF, foo and bar symbols will have
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# the same address
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if AC_TRY_COMMAND([${CC-cc} -o conftest${ac_exeext} $LDFLAGS -Wl,--icf=safe -ffunction-sections conftest.${ac_ext} $LIBS 1>&2]) &&
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test -s conftest${ac_exeext} &&
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objdump -t conftest${ac_exeext} | awk changequote(<<, >>)'{a[<<$>>6] = <<$>>1} END {if (a["foo"] && (a["foo"] != a["bar"])) { exit 1 }}'changequote([, ]); then
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LD_SUPPORTS_ICF=yes
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else
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LD_SUPPORTS_ICF=no
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fi
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rm -rf conftest*])
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if test "$LD_SUPPORTS_ICF" = yes; then
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LDFLAGS="$LDFLAGS -Wl,--icf=safe"
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fi
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fi
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dnl ========================================================
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dnl = Automatically remove dead symbols
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dnl ========================================================
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if test "$GNU_CC" -a "$GCC_USE_GNU_LD" -a -n "$MOZ_DEBUG_FLAGS"; then
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dnl See bug 670659
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AC_CACHE_CHECK([whether removing dead symbols breaks debugging],
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GC_SECTIONS_BREAKS_DEBUG_RANGES,
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[echo 'int foo() {return 42;}' \
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'int bar() {return 1;}' \
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'int main() {return foo();}' > conftest.${ac_ext}
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if AC_TRY_COMMAND([${CC-cc} -o conftest.${ac_objext} $CFLAGS $MOZ_DEBUG_FLAGS -c conftest.${ac_ext} 1>&2]) &&
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AC_TRY_COMMAND([${CC-cc} -o conftest${ac_exeext} $LDFLAGS $MOZ_DEBUG_FLAGS -Wl,--gc-sections conftest.${ac_objext} $LIBS 1>&2]) &&
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test -s conftest${ac_exeext} -a -s conftest.${ac_objext}; then
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if test "`$PYTHON "$_topsrcdir"/build/autoconf/check_debug_ranges.py conftest.${ac_objext} conftest.${ac_ext}`" = \
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"`$PYTHON "$_topsrcdir"/build/autoconf/check_debug_ranges.py conftest${ac_exeext} conftest.${ac_ext}`"; then
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GC_SECTIONS_BREAKS_DEBUG_RANGES=no
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else
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GC_SECTIONS_BREAKS_DEBUG_RANGES=yes
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fi
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else
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dnl We really don't expect to get here, but just in case
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GC_SECTIONS_BREAKS_DEBUG_RANGES="no, but it's broken in some other way"
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fi
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rm -rf conftest*])
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if test "$GC_SECTIONS_BREAKS_DEBUG_RANGES" = no; then
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DSO_LDOPTS="$DSO_LDOPTS -Wl,--gc-sections"
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fi
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fi
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])
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