1 dnl This Source Code Form is subject to the terms of the Mozilla Public
2 dnl License, v. 2.0. If a copy of the MPL was not distributed with this
3 dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
5 AC_DEFUN([MOZ_EXPAND_LIBS],
7 dnl ========================================================
9 dnl = Check what kind of list files are supported by the
12 dnl ========================================================
14 AC_CACHE_CHECK(what kind of list files are supported by the linker,
15 EXPAND_LIBS_LIST_STYLE,
16 [echo "int main() {return 0;}" > conftest.${ac_ext}
17 dnl Because BFD ld doesn't work with LTO + linker scripts, we
18 dnl must pass the LTO CFLAGS to the compile command, and the LTO
19 dnl LDFLAGS to all subsequent link commands.
20 dnl https://sourceware.org/bugzilla/show_bug.cgi?id=23600
21 if AC_TRY_COMMAND(${CC-cc} -o conftest.${OBJ_SUFFIX} -c $MOZ_LTO_CFLAGS $CFLAGS $CPPFLAGS conftest.${ac_ext} 1>&5) && test -s conftest.${OBJ_SUFFIX}; then
22 echo "INPUT(conftest.${OBJ_SUFFIX})" > conftest.list
23 if test "$CC_TYPE" = "clang-cl"; then
24 link="$LINKER -OUT:conftest${ac_exeext}"
26 link="${CC-cc} -o conftest${ac_exeext}"
28 if AC_TRY_COMMAND($link $MOZ_LTO_LDFLAGS $LDFLAGS conftest.list $LIBS 1>&5) && test -s conftest${ac_exeext}; then
29 EXPAND_LIBS_LIST_STYLE=linkerscript
31 echo "conftest.${OBJ_SUFFIX}" > conftest.list
32 dnl -filelist is for the OS X linker. We need to try -filelist
33 dnl first because clang understands @file, but may pass an
34 dnl oversized argument list to the linker depending on the
35 dnl contents of @file.
36 if AC_TRY_COMMAND($link $MOZ_LTO_LDFLAGS $LDFLAGS [-Wl,-filelist,conftest.list] $LIBS 1>&5) && test -s conftest${ac_exeext}; then
37 EXPAND_LIBS_LIST_STYLE=filelist
38 elif AC_TRY_COMMAND($link $MOZ_LTO_LDFLAGS $LDFLAGS @conftest.list $LIBS 1>&5) && test -s conftest${ac_exeext}; then
39 EXPAND_LIBS_LIST_STYLE=list
41 AC_ERROR([Couldn't find one that works])
45 dnl We really don't expect to get here, but just in case
46 AC_ERROR([couldn't compile a simple C file])
50 AC_SUBST(EXPAND_LIBS_LIST_STYLE)