125 lines
5.1 KiB
Text
125 lines
5.1 KiB
Text
dnl This Source Code Form is subject to the terms of the Mozilla Public
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dnl License, v. 2.0. If a copy of the MPL was not distributed with this
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dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
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dnl Add compiler specific options
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dnl A high level macro for selecting compiler options.
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AC_DEFUN([MOZ_COMPILER_OPTS],
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[
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dnl ========================================================
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dnl = Identical Code Folding
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dnl ========================================================
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if test "$CC_TYPE" != "clang-cl" -a "$GCC_USE_GNU_LD" -a -z "$MOZ_DISABLE_ICF" -a -z "$DEVELOPER_OPTIONS"; then
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AC_CACHE_CHECK([whether the linker supports Identical Code Folding],
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moz_cv_opt_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 0;}' > 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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$LLVM_OBJDUMP -t conftest${ac_exeext} | awk changequote(<<, >>)'{a[<<$>>6] = <<$>>1} END {if (a["foo"] && (a["foo"] != a["bar"])) { exit 1 }}'changequote([, ]); then
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moz_cv_opt_ld_supports_icf=yes
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else
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moz_cv_opt_ld_supports_icf=no
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fi
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rm -rf conftest*])
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if test "$moz_cv_opt_ld_supports_icf" = yes; then
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_SAVE_LDFLAGS="$LDFLAGS -Wl,--icf=safe"
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LDFLAGS="$LDFLAGS -Wl,--icf=safe -Wl,--print-icf-sections"
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AC_TRY_LINK([], [],
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[LD_PRINT_ICF_SECTIONS=-Wl,--print-icf-sections],
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[LD_PRINT_ICF_SECTIONS=])
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AC_SUBST([LD_PRINT_ICF_SECTIONS])
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LDFLAGS="$_SAVE_LDFLAGS"
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fi
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fi
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dnl ========================================================
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dnl = Detect static linkage of libstdc++
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dnl ========================================================
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if test "$OS_TARGET" = Linux; then
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AC_CACHE_CHECK([whether we're trying to statically link with libstdc++],
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moz_cv_opt_static_libstdcxx,
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[moz_cv_opt_static_libstdcxx=no
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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cat > conftest.$ac_ext <<EOF
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#include <iostream>
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int main() { std::cout << 1; }
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EOF
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dnl This test is quite conservative: it assumes dynamic linkage if the compilation step fails or if
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dnl the binary format is not supported. But it still detects basic issues.
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if AC_TRY_EVAL([ac_link]) && test -s conftest${ac_exeext} && $LLVM_OBJDUMP --private-headers conftest${ac_exeext} 2> conftest.err 1> conftest.out
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then
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if test -s conftest.err
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then :
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elif grep -q -E 'NEEDED.*lib(std)?c\+\+' conftest.out
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then :
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else moz_cv_opt_static_libstdcxx=yes
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fi
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fi
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AC_LANG_RESTORE
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rm -f conftest*
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])
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if test "$moz_cv_opt_static_libstdcxx" = "yes"; then
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AC_MSG_ERROR([IceCat does not support linking statically with libstdc++])
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fi
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fi
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dnl ========================================================
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dnl = Automatically remove dead symbols
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dnl ========================================================
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if test "$CC_TYPE" != clang-cl -a "$GCC_USE_GNU_LD" -a -z "$DEVELOPER_OPTIONS" -a -z "$MOZ_PROFILE_GENERATE" -a -z "$SANCOV"; then
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if test -n "$MOZ_DEBUG_FLAGS"; then
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dnl See bug 670659
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AC_CACHE_CHECK([whether removing dead symbols breaks debugging],
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moz_cv_opt_gc_sections_breaks_debug_ranges,
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[echo 'int foo() {return 42;}' \
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'int bar() {return 1;}' \
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'int main() {return foo();}' > conftest.${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.${ac_objext}; then
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if test "`$PYTHON3 -m mozbuild.configure.check_debug_ranges conftest.${ac_objext} conftest.${ac_ext}`" = \
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"`$PYTHON3 -m mozbuild.configure.check_debug_ranges conftest${ac_exeext} conftest.${ac_ext}`"; then
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moz_cv_opt_gc_sections_breaks_debug_ranges=no
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else
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moz_cv_opt_gc_sections_breaks_debug_ranges=yes
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fi
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else
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dnl We really don't expect to get here, but just in case
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moz_cv_opt_gc_sections_breaks_debug_ranges="no, but it's broken in some other way"
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fi
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rm -rf conftest*])
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if test "$moz_cv_opt_gc_sections_breaks_debug_ranges" = no; then
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DSO_LDOPTS="$DSO_LDOPTS -Wl,--gc-sections"
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fi
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else
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DSO_LDOPTS="$DSO_LDOPTS -Wl,--gc-sections"
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fi
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fi
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if test "$CC_TYPE" != clang-cl ; then
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case "${OS_TARGET}" in
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Darwin|WASI)
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# It's the default on those targets, and clang complains about -pie
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# being unused if passed.
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;;
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*)
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MOZ_PROGRAM_LDFLAGS="$MOZ_PROGRAM_LDFLAGS -pie"
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;;
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esac
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fi
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AC_SUBST(MOZ_PROGRAM_LDFLAGS)
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])
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