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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)
])
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