Copy in libbacktrace from gcc

This copies in libbacktrace from the gcc repository as it was in the
commit 62e420293a293608f383d9b9c7f2debd666e9fc9.  GDB is going to
start using this library soon.

A dependency between GDB and libbacktrace has already been added to
the top level Makefile, so, after this commit, when building GDB,
libbacktrace will be built first.  However, libbacktrace is not yet
linked into GDB, or used by GDB in any way.

It is possible to stop libbacktrace being built by configuring the
tree with --disable-libbacktrace.

This commit does NOT update src-release.sh, that will be done in the
next commit, this commit ONLY imports libbacktrace from gcc.  This
means that if you try to make a release of GDB from exactly this
commit then the release tar file will not include libbacktrace.
However, as libbacktrace is an optional dependency this is fine.

1 files changed, 586 insertions, 0 deletions

diff --git a/libbacktrace/Makefile.am b/libbacktrace/Makefile.am
new file mode 100644
index 0000000..8874f41
--- /dev/null
+++ b/libbacktrace/Makefile.am
@@ -0,0 +1,586 @@
+# Makefile.am -- Backtrace Makefile.
+# Copyright (C) 2012-2021 Free Software Foundation, Inc.
+
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+
+#     (1) Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+
+#     (2) Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in
+#     the documentation and/or other materials provided with the
+#     distribution.
+
+#     (3) The name of the author may not be used to
+#     endorse or promote products derived from this software without
+#     specific prior written permission.
+
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+ACLOCAL_AMFLAGS = -I .. -I ../config
+
+AM_CPPFLAGS = -I $(top_srcdir)/../include -I $(top_srcdir)/../libgcc \
+	-I ../libgcc
+
+AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG) $(CET_HOST_FLAGS)
+
+noinst_LTLIBRARIES = libbacktrace.la
+
+libbacktrace_la_SOURCES = \
+	backtrace.h \
+	atomic.c \
+	dwarf.c \
+	fileline.c \
+	internal.h \
+	posix.c \
+	print.c \
+	sort.c \
+	state.c
+
+BACKTRACE_FILES = \
+	backtrace.c \
+	simple.c \
+	nounwind.c
+
+FORMAT_FILES = \
+	elf.c \
+	macho.c \
+	pecoff.c \
+	unknown.c \
+	xcoff.c
+
+VIEW_FILES = \
+	read.c \
+	mmapio.c
+
+ALLOC_FILES = \
+	alloc.c \
+	mmap.c
+
+EXTRA_libbacktrace_la_SOURCES = \
+	$(BACKTRACE_FILES) \
+	$(FORMAT_FILES) \
+	$(VIEW_FILES) \
+	$(ALLOC_FILES)
+
+libbacktrace_la_LIBADD = \
+	$(BACKTRACE_FILE) \
+	$(FORMAT_FILE) \
+	$(VIEW_FILE) \
+	$(ALLOC_FILE)
+
+libbacktrace_la_DEPENDENCIES = $(libbacktrace_la_LIBADD)
+
+# Testsuite.
+
+# Add a test to this variable if you want it to be built.
+check_PROGRAMS =
+
+# Add a test to this variable if you want it to be run.
+TESTS =
+
+# Add a test to this variable if you want it to be built and run.
+BUILDTESTS =
+
+# Add a file to this variable if you want it to be built for testing.
+check_DATA =
+
+# Flags to use when compiling test programs.
+libbacktrace_TEST_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) -g
+
+if USE_DSYMUTIL
+
+%.dSYM: %
+	$(DSYMUTIL) $<
+
+endif USE_DSYMUTIL
+
+if NATIVE
+check_LTLIBRARIES = libbacktrace_alloc.la
+
+libbacktrace_alloc_la_SOURCES = $(libbacktrace_la_SOURCES)
+libbacktrace_alloc_la_LIBADD = $(BACKTRACE_FILE) $(FORMAT_FILE) read.lo alloc.lo
+
+libbacktrace_alloc_la_DEPENDENCIES = $(libbacktrace_alloc_la_LIBADD)
+
+check_LTLIBRARIES += libbacktrace_noformat.la
+
+libbacktrace_noformat_la_SOURCES = $(libbacktrace_la_SOURCES)
+libbacktrace_noformat_la_LIBADD = $(BACKTRACE_FILE) $(VIEW_FILE) $(ALLOC_FILE)
+
+libbacktrace_noformat_la_DEPENDENCIES = $(libbacktrace_noformat_la_LIBADD)
+
+if HAVE_ELF
+if HAVE_OBJCOPY_DEBUGLINK
+
+TEST_BUILD_ID_DIR=$(abs_builddir)/usr/lib/debug/.build-id/
+
+check_LTLIBRARIES += libbacktrace_elf_for_test.la
+
+libbacktrace_elf_for_test_la_SOURCES = $(libbacktrace_la_SOURCES)
+libbacktrace_elf_for_test_la_LIBADD = $(BACKTRACE_FILE) elf_for_test.lo \
+	$(VIEW_FILE) $(ALLOC_FILE)
+
+elf_for_test.c: elf.c
+	SEARCH='^#define SYSTEM_BUILD_ID_DIR.*$$'; \
+	REPLACE="#define SYSTEM_BUILD_ID_DIR \"$(TEST_BUILD_ID_DIR)\""; \
+	$(SED) "s%$$SEARCH%$$REPLACE%" \
+		$< \
+		> $@.tmp
+	mv $@.tmp $@
+
+endif HAVE_OBJCOPY_DEBUGLINK
+endif HAVE_ELF
+
+elf_%.c: elf.c
+	SEARCH='#error "Unknown BACKTRACE_ELF_SIZE"'; \
+	REPLACE='#undef BACKTRACE_ELF_SIZE\
+	#define BACKTRACE_ELF_SIZE'; \
+	$(SED) "s/^$$SEARCH\$$/$$REPLACE $*/" \
+		$< \
+		> $@.tmp
+	mv $@.tmp $@
+
+xcoff_%.c: xcoff.c
+	SEARCH='#error "Unknown BACKTRACE_XCOFF_SIZE"'; \
+	REPLACE='#undef BACKTRACE_XCOFF_SIZE\
+	#define BACKTRACE_XCOFF_SIZE'; \
+	$(SED) "s/^$$SEARCH\$$/$$REPLACE $*/" \
+		$< \
+		> $@.tmp
+	mv $@.tmp $@
+
+test_elf_32_SOURCES = test_format.c testlib.c
+test_elf_32_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+test_elf_32_LDADD = libbacktrace_noformat.la elf_32.lo
+
+BUILDTESTS += test_elf_32
+
+test_elf_64_SOURCES = test_format.c testlib.c
+test_elf_64_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+test_elf_64_LDADD = libbacktrace_noformat.la elf_64.lo
+
+BUILDTESTS += test_elf_64
+
+test_macho_SOURCES = test_format.c testlib.c
+test_macho_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+test_macho_LDADD = libbacktrace_noformat.la macho.lo
+
+BUILDTESTS += test_macho
+
+test_xcoff_32_SOURCES = test_format.c testlib.c
+test_xcoff_32_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+test_xcoff_32_LDADD = libbacktrace_noformat.la xcoff_32.lo
+
+BUILDTESTS += test_xcoff_32
+
+test_xcoff_64_SOURCES = test_format.c testlib.c
+test_xcoff_64_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+test_xcoff_64_LDADD = libbacktrace_noformat.la xcoff_64.lo
+
+BUILDTESTS += test_xcoff_64
+
+test_pecoff_SOURCES = test_format.c testlib.c
+test_pecoff_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+test_pecoff_LDADD = libbacktrace_noformat.la pecoff.lo
+
+BUILDTESTS += test_pecoff
+
+test_unknown_SOURCES = test_format.c testlib.c
+test_unknown_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+test_unknown_LDADD = libbacktrace_noformat.la unknown.lo
+
+BUILDTESTS += test_unknown
+
+unittest_SOURCES = unittest.c testlib.c
+unittest_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+unittest_LDADD = libbacktrace.la
+
+BUILDTESTS += unittest
+
+unittest_alloc_SOURCES = $(unittest_SOURCES)
+unittest_alloc_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+unittest_alloc_LDADD = libbacktrace_alloc.la
+
+BUILDTESTS += unittest_alloc
+
+check_LTLIBRARIES += libbacktrace_instrumented_alloc.la
+
+libbacktrace_instrumented_alloc_la_SOURCES = $(libbacktrace_la_SOURCES)
+libbacktrace_instrumented_alloc_la_LIBADD = $(BACKTRACE_FILE) $(FORMAT_FILE) \
+	read.lo instrumented_alloc.lo
+
+libbacktrace_instrumented_alloc_la_DEPENDENCIES = \
+	$(libbacktrace_instrumented_alloc_la_LIBADD)
+
+instrumented_alloc.lo: alloc.c
+
+allocfail_SOURCES = allocfail.c testlib.c
+allocfail_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+allocfail_LDADD = libbacktrace_instrumented_alloc.la
+
+check_PROGRAMS += allocfail
+
+allocfail.sh: allocfail
+
+TESTS += allocfail.sh
+
+if USE_DSYMUTIL
+check_DATA += allocfail.dSYM
+endif USE_DSYMUTIL
+
+if HAVE_ELF
+if HAVE_OBJCOPY_DEBUGLINK
+
+b2test_SOURCES = $(btest_SOURCES)
+b2test_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+b2test_LDFLAGS = -Wl,--build-id
+b2test_LDADD = libbacktrace_elf_for_test.la
+
+check_PROGRAMS += b2test
+TESTS += b2test_buildid
+
+if HAVE_DWZ
+
+b3test_SOURCES = $(btest_SOURCES)
+b3test_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+b3test_LDFLAGS = -Wl,--build-id
+b3test_LDADD = libbacktrace_elf_for_test.la
+
+check_PROGRAMS += b3test
+TESTS += b3test_dwz_buildid
+
+endif HAVE_DWZ
+
+endif HAVE_OBJCOPY_DEBUGLINK
+endif HAVE_ELF
+
+btest_SOURCES = btest.c testlib.c
+btest_CFLAGS = $(libbacktrace_TEST_CFLAGS) -O
+btest_LDADD = libbacktrace.la
+
+BUILDTESTS += btest
+
+if USE_DSYMUTIL
+check_DATA += btest.dSYM
+endif USE_DSYMUTIL
+
+if HAVE_ELF
+
+btest_lto_SOURCES = btest.c testlib.c
+btest_lto_CFLAGS = $(libbacktrace_TEST_CFLAGS) -O -flto
+btest_lto_LDADD = libbacktrace.la
+
+BUILDTESTS += btest_lto
+
+endif HAVE_ELF
+
+btest_alloc_SOURCES = $(btest_SOURCES)
+btest_alloc_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+btest_alloc_LDADD = libbacktrace_alloc.la
+
+BUILDTESTS += btest_alloc
+
+if USE_DSYMUTIL
+check_DATA += btest_alloc.dSYM
+endif USE_DSYMUTIL
+
+if HAVE_DWZ
+
+%_dwz: %
+	rm -f $@ $@_common.debug
+	cp $< $@_1
+	cp $< $@_2
+	if $(DWZ) -m $@_common.debug $@_1 $@_2; then \
+	  rm -f $@_2; \
+	  mv $@_1 $@; \
+	else \
+	  echo "Ignoring dwz errors, assuming that test passes"; \
+	  cp $< $@; \
+	fi
+
+TESTS += btest_dwz
+
+if HAVE_OBJCOPY_DEBUGLINK
+
+TESTS += btest_dwz_gnudebuglink
+
+endif HAVE_OBJCOPY_DEBUGLINK
+
+endif HAVE_DWZ
+
+stest_SOURCES = stest.c
+stest_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+stest_LDADD = libbacktrace.la
+
+BUILDTESTS += stest
+
+if USE_DSYMUTIL
+check_DATA += stest.dSYM
+endif USE_DSYMUTIL
+
+stest_alloc_SOURCES = $(stest_SOURCES)
+stest_alloc_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+stest_alloc_LDADD = libbacktrace_alloc.la
+
+BUILDTESTS += stest_alloc
+
+if USE_DSYMUTIL
+check_DATA += stest_alloc.dSYM
+endif USE_DSYMUTIL
+
+if HAVE_ELF
+
+ztest_SOURCES = ztest.c testlib.c
+ztest_CFLAGS = $(libbacktrace_TEST_CFLAGS) -DSRCDIR=\"$(srcdir)\"
+ztest_LDADD = libbacktrace.la
+ztest_alloc_LDADD = libbacktrace_alloc.la
+
+if HAVE_ZLIB
+ztest_LDADD += -lz
+ztest_alloc_LDADD += -lz
+endif
+ztest_LDADD += $(CLOCK_GETTIME_LINK)
+ztest_alloc_LDADD += $(CLOCK_GETTIME_LINK)
+
+BUILDTESTS += ztest
+
+ztest_alloc_SOURCES = $(ztest_SOURCES)
+ztest_alloc_CFLAGS = $(ztest_CFLAGS)
+
+BUILDTESTS += ztest_alloc
+
+endif HAVE_ELF
+
+edtest_SOURCES = edtest.c edtest2_build.c testlib.c
+edtest_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+edtest_LDADD = libbacktrace.la
+
+BUILDTESTS += edtest
+
+if USE_DSYMUTIL
+check_DATA += edtest.dSYM
+endif USE_DSYMUTIL
+
+edtest_alloc_SOURCES = $(edtest_SOURCES)
+edtest_alloc_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+edtest_alloc_LDADD = libbacktrace_alloc.la
+
+if USE_DSYMUTIL
+check_DATA += edtest_alloc.dSYM
+endif USE_DSYMUTIL
+
+BUILDTESTS += edtest_alloc
+
+edtest2_build.c: gen_edtest2_build; @true
+gen_edtest2_build: $(srcdir)/edtest2.c
+	cat $(srcdir)/edtest2.c > tmp-edtest2_build.c
+	$(SHELL) $(srcdir)/../move-if-change tmp-edtest2_build.c edtest2_build.c
+	echo timestamp > $@
+
+if HAVE_PTHREAD
+
+BUILDTESTS += ttest
+
+ttest_SOURCES = ttest.c testlib.c
+ttest_CFLAGS = $(libbacktrace_TEST_CFLAGS) -pthread
+ttest_LDADD = libbacktrace.la
+
+if USE_DSYMUTIL
+check_DATA += ttest.dSYM
+endif USE_DSYMUTIL
+
+BUILDTESTS += ttest_alloc
+
+ttest_alloc_SOURCES = $(ttest_SOURCES)
+ttest_alloc_CFLAGS = $(ttest_CFLAGS)
+ttest_alloc_LDADD = libbacktrace_alloc.la
+
+if USE_DSYMUTIL
+check_DATA += ttest_alloc.dSYM
+endif USE_DSYMUTIL
+
+endif HAVE_PTHREAD
+
+if HAVE_OBJCOPY_DEBUGLINK
+
+TESTS += btest_gnudebuglink
+
+%_gnudebuglink: %
+	$(OBJCOPY) --only-keep-debug $< $@.debug
+	$(OBJCOPY) --strip-debug --add-gnu-debuglink=$@.debug $< $@
+
+endif HAVE_OBJCOPY_DEBUGLINK
+
+%_buildid: %
+	./install-debuginfo-for-buildid.sh \
+	  "$(TEST_BUILD_ID_DIR)" \
+	  $<
+	$(OBJCOPY) --strip-debug $< $@
+
+if HAVE_COMPRESSED_DEBUG
+
+ctestg_SOURCES = btest.c testlib.c
+ctestg_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+ctestg_LDFLAGS = -Wl,--compress-debug-sections=zlib-gnu
+ctestg_LDADD = libbacktrace.la
+
+ctesta_SOURCES = btest.c testlib.c
+ctesta_CFLAGS = $(libbacktrace_TEST_CFLAGS)
+ctesta_LDFLAGS = -Wl,--compress-debug-sections=zlib-gabi
+ctesta_LDADD = libbacktrace.la
+
+BUILDTESTS += ctestg ctesta
+
+ctestg_alloc_SOURCES = $(ctestg_SOURCES)
+ctestg_alloc_CFLAGS = $(ctestg_CFLAGS)
+ctestg_alloc_LDFLAGS = $(ctestg_LDFLAGS)
+ctestg_alloc_LDADD = libbacktrace_alloc.la
+
+ctesta_alloc_SOURCES = $(ctesta_SOURCES)
+ctesta_alloc_CFLAGS = $(ctesta_CFLAGS)
+ctesta_alloc_LDFLAGS = $(ctesta_LDFLAGS)
+ctesta_alloc_LDADD = libbacktrace_alloc.la
+
+BUILDTESTS += ctestg_alloc ctesta_alloc
+
+endif
+
+if HAVE_DWARF5
+
+dwarf5_SOURCES = btest.c testlib.c
+dwarf5_CFLAGS = $(libbacktrace_TEST_CFLAGS) -gdwarf-5
+dwarf5_LDADD = libbacktrace.la
+
+BUILDTESTS += dwarf5
+
+if USE_DSYMUTIL
+check_DATA += dwarf5.dSYM
+endif USE_DSYMUTIL
+
+dwarf5_alloc_SOURCES = $(dwarf5_SOURCES)
+dwarf5_alloc_CFLAGS = $(dwarf5_CFLAGS)
+dwarf5_alloc_LDADD = libbacktrace_alloc.la
+
+BUILDTESTS += dwarf5_alloc
+
+if USE_DSYMUTIL
+check_DATA += dwarf5_alloc.dSYM
+endif USE_DSYMUTIL
+
+endif
+
+mtest_SOURCES = mtest.c testlib.c
+mtest_CFLAGS = $(libbacktrace_TEST_CFLAGS) -O
+mtest_LDADD = libbacktrace.la
+
+BUILDTESTS += mtest
+
+if USE_DSYMUTIL
+check_DATA += mtest.dSYM
+endif USE_DSYMUTIL
+
+if HAVE_MINIDEBUG
+
+TESTS += mtest_minidebug
+
+%_minidebug: %
+	$(NM) -D $< -P --defined-only | $(AWK) '{ print $$1 }' | sort > $<.dsyms
+	$(NM) $< -P --defined-only | $(AWK) '{ if ($$2 == "T" || $$2 == "t" || $$2 == "D") print $$1 }' | sort > $<.fsyms
+	$(COMM) -13 $<.dsyms $<.fsyms > $<.keepsyms
+	$(OBJCOPY) --only-keep-debug $< $<.dbg
+	$(OBJCOPY) -S --remove-section .gdb_index --remove-section .comment --keep-symbols=$<.keepsyms $<.dbg $<.mdbg
+	$(OBJCOPY) --strip-all --remove-section ..comment $< $<.strip
+	rm -f $<.mdbg.xz
+	$(XZ) $<.mdbg
+	$(OBJCOPY) --add-section .gnu_debugdata=$<.mdbg.xz $<.strip
+	mv $<.strip $@
+
+endif HAVE_MINIDEBUG
+
+endif NATIVE
+
+if HAVE_ELF
+
+xztest_SOURCES = xztest.c testlib.c
+xztest_CFLAGS = $(libbacktrace_TEST_CFLAGS) -DSRCDIR=\"$(srcdir)\"
+xztest_LDADD = libbacktrace.la
+
+xztest_alloc_SOURCES = $(xztest_SOURCES)
+xztest_alloc_CFLAGS = $(xztest_CFLAGS)
+xztest_alloc_LDADD = libbacktrace_alloc.la
+
+if HAVE_LIBLZMA
+xztest_LDADD += -llzma
+xztest_alloc_LDADD += -llzma
+endif
+
+xztest_LDADD += $(CLOCK_GETTIME_LINK)
+xztest_alloc_LDADD += $(CLOCK_GETTIME_LINK)
+
+BUILDTESTS += xztest xztest_alloc
+
+endif HAVE_ELF
+
+check_PROGRAMS += $(BUILDTESTS)
+
+TESTS += $(BUILDTESTS)
+
+CLEANFILES = \
+	$(TESTS) *.debug elf_for_test.c edtest2_build.c gen_edtest2_build \
+	*.dsyms *.fsyms *.keepsyms *.dbg *.mdbg *.mdbg.xz *.strip
+
+clean-local:
+	-rm -rf usr
+
+# We can't use automake's automatic dependency tracking, because it
+# breaks when using bootstrap-lean.  Automatic dependency tracking
+# with GCC bootstrap will cause some of the objects to depend on
+# header files in prev-gcc/include, e.g., stddef.h and stdarg.h.  When
+# using bootstrap-lean, prev-gcc is removed after each stage.  When
+# running "make install", those header files will be gone, causing the
+# library to be rebuilt at install time.  That may not succeed.
+
+# These manual dependencies do not include dependencies on unwind.h,
+# even though that is part of GCC, because where to find it depends on
+# whether we are being built as a host library or a target library.
+
+INCDIR = $(top_srcdir)/../include
+alloc.lo: config.h backtrace.h internal.h
+backtrace.lo: config.h backtrace.h internal.h
+btest.lo: $(INCDIR)/filenames.h backtrace.h backtrace-supported.h
+dwarf.lo: config.h $(INCDIR)/dwarf2.h $(INCDIR)/dwarf2.def \
+	$(INCDIR)/filenames.h backtrace.h internal.h
+elf.lo: config.h backtrace.h internal.h
+fileline.lo: config.h backtrace.h internal.h
+macho.lo: config.h backtrace.h internal.h
+mmap.lo: config.h backtrace.h internal.h
+mmapio.lo: config.h backtrace.h internal.h
+mtest.lo: backtrace.h backtrace-supported.h
+nounwind.lo: config.h internal.h
+pecoff.lo: config.h backtrace.h internal.h
+posix.lo: config.h backtrace.h internal.h
+print.lo: config.h backtrace.h internal.h
+read.lo: config.h backtrace.h internal.h
+simple.lo: config.h backtrace.h internal.h
+sort.lo: config.h backtrace.h internal.h
+stest.lo: config.h backtrace.h internal.h
+state.lo: config.h backtrace.h backtrace-supported.h internal.h
+unknown.lo: config.h backtrace.h internal.h
+xcoff.lo: config.h backtrace.h internal.h
+xztest.lo: config.h backtrace.h backtrace-supported.h internal.h testlib.h
+ztest.lo: config.h backtrace.h backtrace-supported.h internal.h testlib.h
+
+include $(top_srcdir)/../multilib.am