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-rw-r--r--build/autoconf/expandlibs.m453
1 files changed, 53 insertions, 0 deletions
diff --git a/build/autoconf/expandlibs.m4 b/build/autoconf/expandlibs.m4
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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,
+ moz_cv_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
+ moz_cv_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
+ moz_cv_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
+ moz_cv_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*])
+
+EXPAND_LIBS_LIST_STYLE=$moz_cv_expand_libs_list_style
+AC_SUBST(EXPAND_LIBS_LIST_STYLE)
+
+])