diff options
Diffstat (limited to 'build/autoconf/expandlibs.m4')
| -rw-r--r-- | build/autoconf/expandlibs.m4 | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/build/autoconf/expandlibs.m4 b/build/autoconf/expandlibs.m4 new file mode 100644 index 0000000000..959ee6f1b9 --- /dev/null +++ b/build/autoconf/expandlibs.m4 @@ -0,0 +1,52 @@ +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/. + +AC_DEFUN([MOZ_EXPAND_LIBS], +[ +dnl ======================================================== +dnl = +dnl = Check what kind of list files are supported by the +dnl = linker +dnl = +dnl ======================================================== + +AC_CACHE_CHECK(what kind of list files are supported by the linker, + EXPAND_LIBS_LIST_STYLE, + [echo "int main() {return 0;}" > conftest.${ac_ext} + dnl Because BFD ld doesn't work with LTO + linker scripts, we + dnl must pass the LTO CFLAGS to the compile command, and the LTO + dnl LDFLAGS to all subsequent link commands. + dnl https://sourceware.org/bugzilla/show_bug.cgi?id=23600 + if AC_TRY_COMMAND(${CC-cc} -o conftest.${OBJ_SUFFIX} -c $MOZ_LTO_CFLAGS $CFLAGS $CPPFLAGS conftest.${ac_ext} 1>&5) && test -s conftest.${OBJ_SUFFIX}; then + echo "INPUT(conftest.${OBJ_SUFFIX})" > conftest.list + if test "$CC_TYPE" = "clang-cl"; then + link="$LINKER -OUT:conftest${ac_exeext}" + else + link="${CC-cc} -o conftest${ac_exeext}" + fi + if AC_TRY_COMMAND($link $MOZ_LTO_LDFLAGS $LDFLAGS conftest.list $LIBS 1>&5) && test -s conftest${ac_exeext}; then + EXPAND_LIBS_LIST_STYLE=linkerscript + else + echo "conftest.${OBJ_SUFFIX}" > conftest.list + dnl -filelist is for the OS X linker. We need to try -filelist + dnl first because clang understands @file, but may pass an + dnl oversized argument list to the linker depending on the + dnl contents of @file. + if AC_TRY_COMMAND($link $MOZ_LTO_LDFLAGS $LDFLAGS [-Wl,-filelist,conftest.list] $LIBS 1>&5) && test -s conftest${ac_exeext}; then + EXPAND_LIBS_LIST_STYLE=filelist + elif AC_TRY_COMMAND($link $MOZ_LTO_LDFLAGS $LDFLAGS @conftest.list $LIBS 1>&5) && test -s conftest${ac_exeext}; then + EXPAND_LIBS_LIST_STYLE=list + else + AC_ERROR([Couldn't find one that works]) + fi + fi + else + dnl We really don't expect to get here, but just in case + AC_ERROR([couldn't compile a simple C file]) + fi + rm -rf conftest*]) + +AC_SUBST(EXPAND_LIBS_LIST_STYLE) + +]) |