| dnl This Source Code Form is subject to the terms of the Mozilla Public |
| dnl License, v. 2.0. If a copy of the MPL was not distributed with this |
| dnl file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| |
| dnl Add compiler specific options |
| |
| AC_DEFUN([MOZ_DEFAULT_COMPILER], |
| [ |
| dnl Default to MSVC for win32 and gcc-4.2 for darwin |
| dnl ============================================================== |
| if test -z "$CROSS_COMPILE"; then |
| case "$target" in |
| *-mingw*) |
| if test -z "$CC"; then CC=cl; fi |
| if test -z "$CXX"; then CXX=cl; fi |
| if test -z "$CPP"; then CPP="cl -E -nologo"; fi |
| if test -z "$CXXCPP"; then CXXCPP="cl -TP -E -nologo"; ac_cv_prog_CXXCPP="$CXXCPP"; fi |
| if test -z "$LD"; then LD=link; fi |
| if test -z "$AS"; then |
| case "${target_cpu}" in |
| i*86) |
| AS=ml; |
| ;; |
| x86_64) |
| AS=ml64; |
| ;; |
| esac |
| fi |
| if test -z "$MIDL"; then MIDL=midl; fi |
| |
| # need override this flag since we don't use $(LDFLAGS) for this. |
| if test -z "$HOST_LDFLAGS" ; then |
| HOST_LDFLAGS=" " |
| fi |
| ;; |
| *-darwin*) |
| # GCC on darwin is based on gcc 4.2 and we don't support it anymore. |
| if test -z "$CC"; then |
| MOZ_PATH_PROGS(CC, clang) |
| fi |
| if test -z "$CXX"; then |
| MOZ_PATH_PROGS(CXX, clang++) |
| fi |
| IS_GCC=$($CC -v 2>&1 | grep gcc) |
| if test -n "$IS_GCC" |
| then |
| echo gcc is known to be broken on OS X, please use clang. |
| echo see http://developer.mozilla.org/en-US/docs/Developer_Guide/Build_Instructions/Mac_OS_X_Prerequisites |
| echo for more information. |
| exit 1 |
| fi |
| ;; |
| esac |
| fi |
| ]) |
| |
| dnl ============================================================================ |
| dnl C++ rtti |
| dnl We don't use it in the code, but it can be usefull for debugging, so give |
| dnl the user the option of enabling it. |
| dnl ============================================================================ |
| AC_DEFUN([MOZ_RTTI], |
| [ |
| MOZ_ARG_ENABLE_BOOL(cpp-rtti, |
| [ --enable-cpp-rtti Enable C++ RTTI ], |
| [ _MOZ_USE_RTTI=1 ], |
| [ _MOZ_USE_RTTI= ]) |
| |
| if test -z "$_MOZ_USE_RTTI"; then |
| if test "$GNU_CC"; then |
| CXXFLAGS="$CXXFLAGS -fno-rtti" |
| else |
| case "$target" in |
| *-mingw*) |
| CXXFLAGS="$CXXFLAGS -GR-" |
| esac |
| fi |
| fi |
| ]) |
| |
| dnl A high level macro for selecting compiler options. |
| AC_DEFUN([MOZ_COMPILER_OPTS], |
| [ |
| MOZ_RTTI |
| if test "$CLANG_CXX"; then |
| ## We disable return-type-c-linkage because jsval is defined as a C++ type but is |
| ## returned by C functions. This is possible because we use knowledge about the ABI |
| ## to typedef it to a C type with the same layout when the headers are included |
| ## from C. |
| ## |
| ## mismatched-tags is disabled (bug 780474) mostly because it's useless. |
| ## Worse, it's not supported by gcc, so it will cause tryserver bustage |
| ## without any easy way for non-Clang users to check for it. |
| _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -Wno-unknown-warning-option -Wno-return-type-c-linkage -Wno-mismatched-tags" |
| fi |
| |
| if test -z "$GNU_CC"; then |
| case "$target" in |
| *-mingw*) |
| ## Warning 4099 (equivalent of mismatched-tags) is disabled (bug 780474) |
| ## for the same reasons as above. |
| _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -wd4099" |
| esac |
| fi |
| |
| if test "$GNU_CC"; then |
| CFLAGS="$CFLAGS -ffunction-sections -fdata-sections" |
| CXXFLAGS="$CXXFLAGS -ffunction-sections -fdata-sections -fno-exceptions" |
| 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 |
| ]) |
