1dnl This Source Code Form is subject to the terms of the Mozilla Public
2dnl License, v. 2.0. If a copy of the MPL was not distributed with this
3dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
4
5AC_DEFUN([MOZ_EXPAND_LIBS],
6[
7dnl ========================================================
8dnl =
9dnl = Check what kind of list files are supported by the
10dnl = linker
11dnl =
12dnl ========================================================
13
14AC_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${ac_exeext}"
25         else
26             link="${CC-cc} -o conftest${ac_exeext}"
27         fi
28         if AC_TRY_COMMAND($link $MOZ_LTO_LDFLAGS $LDFLAGS conftest.list $LIBS 1>&5) && test -s conftest${ac_exeext}; then
29             EXPAND_LIBS_LIST_STYLE=linkerscript
30         else
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
40             else
41                 AC_ERROR([Couldn't find one that works])
42             fi
43         fi
44     else
45         dnl We really don't expect to get here, but just in case
46         AC_ERROR([couldn't compile a simple C file])
47     fi
48     rm -rf conftest*])
49
50AC_SUBST(EXPAND_LIBS_LIST_STYLE)
51
52])
53