libbacktrace: support MiniDebugInfo

libbacktrace/ChangeLog: PR libbacktrace/93608 Add support for MiniDebugInfo. * elf.c (struct elf_view): Define. Replace most uses of backtrace_view with elf_view. (elf_get_view): New static functions. Replace most calls of backtrace_get_view with elf_get_view. (elf_release_view): New static functions. Replace most calls of backtrace_release_view with elf_release_view. (elf_uncompress_failed): Rename from elf_zlib_failed. Change all callers. (LZMA_STATES, LZMA_POS_STATES, LZMA_DIST_STATES): Define. (LZMA_DIST_SLOTS, LZMA_DIST_MODEL_START): Define. (LZMA_DIST_MODEL_END, LZMA_FULL_DISTANCES): Define. (LZMA_ALIGN_SIZE, LZMA_LEN_LOW_SYMBOLS): Define. (LZMA_LEN_MID_SYMBOLS, LZMA_LEN_HIGH_SYMBOLS): Define. (LZMA_LITERAL_CODERS_MAX, LZMA_LITERAL_CODER_SIZE): Define. (LZMA_PROB_IS_MATCH_LEN, LZMA_PROB_IS_REP_LEN): Define. (LZMA_PROB_IS_REP0_LEN, LZMA_PROB_IS_REP1_LEN): Define. (LZMA_PROB_IS_REP2_LEN, LZMA_PROB_IS_REP0_LONG_LEN): Define. (LZMA_PROB_DIST_SLOT_LEN, LZMA_PROB_DIST_SPECIAL_LEN): Define. (LZMA_PROB_DIST_ALIGN_LEN): Define. (LZMA_PROB_MATCH_LEN_CHOICE_LEN): Define. (LZMA_PROB_MATCH_LEN_CHOICE2_LEN): Define. (LZMA_PROB_MATCH_LEN_LOW_LEN): Define. (LZMA_PROB_MATCH_LEN_MID_LEN): Define. (LZMA_PROB_MATCH_LEN_HIGH_LEN): Define. (LZMA_PROB_REP_LEN_CHOICE_LEN): Define. (LZMA_PROB_REP_LEN_CHOICE2_LEN): Define. (LZMA_PROB_REP_LEN_LOW_LEN): Define. (LZMA_PROB_REP_LEN_MID_LEN): Define. (LZMA_PROB_REP_LEN_HIGH_LEN): Define. (LZMA_PROB_LITERAL_LEN): Define. (LZMA_PROB_IS_MATCH_OFFSET, LZMA_PROB_IS_REP_OFFSET): Define. (LZMA_PROB_IS_REP0_OFFSET, LZMA_PROB_IS_REP1_OFFSET): Define. (LZMA_PROB_IS_REP2_OFFSET): Define. (LZMA_PROB_IS_REP0_LONG_OFFSET): Define. (LZMA_PROB_DIST_SLOT_OFFSET): Define. (LZMA_PROB_DIST_SPECIAL_OFFSET): Define. (LZMA_PROB_DIST_ALIGN_OFFSET): Define. (LZMA_PROB_MATCH_LEN_CHOICE_OFFSET): Define. (LZMA_PROB_MATCH_LEN_CHOICE2_OFFSET): Define. (LZMA_PROB_MATCH_LEN_LOW_OFFSET): Define. (LZMA_PROB_MATCH_LEN_MID_OFFSET): Define. (LZMA_PROB_MATCH_LEN_HIGH_OFFSET): Define. (LZMA_PROB_REP_LEN_CHOICE_OFFSET): Define. (LZMA_PROB_REP_LEN_CHOICE2_OFFSET): Define. (LZMA_PROB_REP_LEN_LOW_OFFSET): Define. (LZMA_PROB_REP_LEN_MID_OFFSET): Define. (LZMA_PROB_REP_LEN_HIGH_OFFSET): Define. (LZMA_PROB_LITERAL_OFFSET): Define. (LZMA_PROB_TOTAL_COUNT): Define. (LZMA_IS_MATCH, LZMA_IS_REP, LZMA_IS_REP0): Define. (LZMA_IS_REP1, LZMA_IS_REP2, LZMA_IS_REP0_LONG): Define. (LZMA_DIST_SLOT, LZMA_DIST_SPECIAL, LZMA_DIST_ALIGN): Define. (LZMA_MATCH_LEN_CHOICE, LZMA_MATCH_LEN_CHOICE2): Define. (LZMA_MATCH_LEN_LOW, LZMA_MATCH_LEN_MID): Define. (LZMA_MATCH_LEN_HIGH, LZMA_REP_LEN_CHOICE): Define. (LZMA_REP_LEN_CHOICE2, LZMA_REP_LEN_LOW): Define. (LZMA_REP_LEN_MID, LZMA_REP_LEN_HIGH, LZMA_LITERAL): Define. (elf_lzma_varint): New static function. (elf_lzma_range_normalize): New static function. (elf_lzma_bit, elf_lzma_integer): New static functions. (elf_lzma_reverse_integer): New static function. (elf_lzma_len, elf_uncompress_lzma_block): New static functions. (elf_uncompress_lzma): New static function. (backtrace_uncompress_lzma): New function. (elf_add): Add memory and memory_size parameters. Change all callers. Look for .gnu_debugdata section, and, if found, decompress it and use it for symbols and debug info. Permit the descriptor parameter to be -1. * internal.h (backtrace_uncompress_lzma): Declare. * mtest.c: New file. * xztest.c: New file. * configure.ac: Check for nm, xz, and comm programs. Check for liblzma library. (HAVE_MINIDEBUG): Define. * Makefile.am (mtest_SOURCES): Define. (mtest_CFLAGS, mtest_LDADD): Define. (TESTS): Add mtest_minidebug if HAVE_MINIDEBUG. (%_minidebug): New pattern rule, if HAVE_MINIDEBUG. (xztest_SOURCES, xztest_CFLAGS, xztest_LDADD): Define. (xztest_alloc_SOURCES, xztest_alloc_CFLAGS): Define (xztest_alloc_LDADD): Define. (BUILDTESTS): Add mtest, xztest, xztest_alloc. (CLEANFILES): Add files created by minidebug pattern. (btest.lo): Correct INCDIR reference. (mtest.lo, xztest.lo, ztest.lo): New targets. * configure: Regenerate. * config.h.in: Regenerate. * Makefile.in: Regenerate.
2020-09-14 14:01:56 -07:00 · 2020-09-14 14:01:56 -07:00 · 05f40bc4c1
commit 05f40bc4c1
parent cd6743e9c4
9 changed files with 2913 additions and 166 deletions
--- a/libbacktrace/Makefile.am
+++ b/libbacktrace/Makefile.am
@ -478,13 +478,61 @@ endif HAVE_DSYMUTIL

 endif

+mtest_SOURCES = mtest.c testlib.c
+mtest_CFLAGS = $(libbacktrace_TEST_CFLAGS) -O
+mtest_LDADD = libbacktrace.la
+
+BUILDTESTS += mtest
+
+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
+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
@ -504,7 +552,7 @@ clean-local:
 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
+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
@ -512,6 +560,7 @@ 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
@ -523,5 +572,7 @@ 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
--- a/libbacktrace/Makefile.in
+++ b/libbacktrace/Makefile.in
@ -121,10 +121,10 @@ build_triplet = @build@
 host_triplet = @host@
 target_triplet = @target@
 check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
-	$(am__EXEEXT_12)
+	$(am__EXEEXT_14)
 TESTS = $(am__append_4) $(am__append_7) $(am__append_9) \
 	$(am__append_12) $(am__append_13) $(am__append_20) \
-	$(am__EXEEXT_12)
+	$(am__append_25) $(am__EXEEXT_14)
@HAVE_ELF_TRUE@@HAVE_OBJCOPY_DEBUGLINK_TRUE@@NATIVE_TRUE@am__append_1 = libbacktrace_elf_for_test.la
@NATIVE_TRUE@am__append_2 = test_elf_32 test_elf_64 test_macho \
@NATIVE_TRUE@	test_xcoff_32 test_xcoff_64 test_pecoff \
@ -157,6 +157,11 @@ TESTS = $(am__append_4) $(am__append_7) $(am__append_9) \
@HAVE_DWARF5_TRUE@@NATIVE_TRUE@am__append_22 = dwarf5 dwarf5_alloc
@HAVE_DSYMUTIL_TRUE@@HAVE_DWARF5_TRUE@@NATIVE_TRUE@am__append_23 = dwarf5.dSYM \
@HAVE_DSYMUTIL_TRUE@@HAVE_DWARF5_TRUE@@NATIVE_TRUE@	dwarf5_alloc.dSYM
+@NATIVE_TRUE@am__append_24 = mtest
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@am__append_25 = mtest_minidebug
+@HAVE_ELF_TRUE@@HAVE_LIBLZMA_TRUE@am__append_26 = -llzma
+@HAVE_ELF_TRUE@@HAVE_LIBLZMA_TRUE@am__append_27 = -llzma
+@HAVE_ELF_TRUE@am__append_28 = xztest xztest_alloc
 subdir = .
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../config/cet.m4 \
@ -235,9 +240,12 @@ libbacktrace_noformat_la_OBJECTS =  \
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@	ctesta_alloc$(EXEEXT)
@HAVE_DWARF5_TRUE@@NATIVE_TRUE@am__EXEEXT_11 = dwarf5$(EXEEXT) \
@HAVE_DWARF5_TRUE@@NATIVE_TRUE@	dwarf5_alloc$(EXEEXT)
-am__EXEEXT_12 = $(am__EXEEXT_4) $(am__EXEEXT_5) $(am__EXEEXT_6) \
+@NATIVE_TRUE@am__EXEEXT_12 = mtest$(EXEEXT)
+@HAVE_ELF_TRUE@am__EXEEXT_13 = xztest$(EXEEXT) xztest_alloc$(EXEEXT)
+am__EXEEXT_14 = $(am__EXEEXT_4) $(am__EXEEXT_5) $(am__EXEEXT_6) \
 	$(am__EXEEXT_7) $(am__EXEEXT_8) $(am__EXEEXT_9) \
-	$(am__EXEEXT_10) $(am__EXEEXT_11)
+	$(am__EXEEXT_10) $(am__EXEEXT_11) $(am__EXEEXT_12) \
+	$(am__EXEEXT_13)
@NATIVE_TRUE@am_allocfail_OBJECTS = allocfail-allocfail.$(OBJEXT) \
@NATIVE_TRUE@	allocfail-testlib.$(OBJEXT)
 allocfail_OBJECTS = $(am_allocfail_OBJECTS)
@ -355,6 +363,13 @@ edtest_alloc_OBJECTS = $(am_edtest_alloc_OBJECTS)
 edtest_alloc_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(edtest_alloc_CFLAGS) \
 	$(CFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@
+@NATIVE_TRUE@am_mtest_OBJECTS = mtest-mtest.$(OBJEXT) \
+@NATIVE_TRUE@	mtest-testlib.$(OBJEXT)
+mtest_OBJECTS = $(am_mtest_OBJECTS)
+@NATIVE_TRUE@mtest_DEPENDENCIES = libbacktrace.la
+mtest_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(mtest_CFLAGS) $(CFLAGS) \
+	$(AM_LDFLAGS) $(LDFLAGS) -o $@
@NATIVE_TRUE@am_stest_OBJECTS = stest-stest.$(OBJEXT)
 stest_OBJECTS = $(am_stest_OBJECTS)
@NATIVE_TRUE@stest_DEPENDENCIES = libbacktrace.la
@ -465,6 +480,23 @@ unittest_alloc_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC \
 	$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=link $(CCLD) \
 	$(unittest_alloc_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o \
 	$@
+@HAVE_ELF_TRUE@am_xztest_OBJECTS = xztest-xztest.$(OBJEXT) \
+@HAVE_ELF_TRUE@	xztest-testlib.$(OBJEXT)
+xztest_OBJECTS = $(am_xztest_OBJECTS)
+@HAVE_ELF_TRUE@xztest_DEPENDENCIES = libbacktrace.la \
+@HAVE_ELF_TRUE@	$(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1)
+xztest_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(xztest_CFLAGS) $(CFLAGS) \
+	$(AM_LDFLAGS) $(LDFLAGS) -o $@
+@HAVE_ELF_TRUE@am__objects_12 = xztest_alloc-xztest.$(OBJEXT) \
+@HAVE_ELF_TRUE@	xztest_alloc-testlib.$(OBJEXT)
+@HAVE_ELF_TRUE@am_xztest_alloc_OBJECTS = $(am__objects_12)
+xztest_alloc_OBJECTS = $(am_xztest_alloc_OBJECTS)
+@HAVE_ELF_TRUE@xztest_alloc_DEPENDENCIES = libbacktrace_alloc.la \
+@HAVE_ELF_TRUE@	$(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1)
+xztest_alloc_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(xztest_alloc_CFLAGS) \
+	$(CFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@
@HAVE_ELF_TRUE@@NATIVE_TRUE@am_ztest_OBJECTS = ztest-ztest.$(OBJEXT) \
@HAVE_ELF_TRUE@@NATIVE_TRUE@	ztest-testlib.$(OBJEXT)
 ztest_OBJECTS = $(am_ztest_OBJECTS)
@ -474,11 +506,11 @@ ztest_OBJECTS = $(am_ztest_OBJECTS)
 ztest_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(ztest_CFLAGS) $(CFLAGS) \
 	$(AM_LDFLAGS) $(LDFLAGS) -o $@
-@HAVE_ELF_TRUE@@NATIVE_TRUE@am__objects_12 =  \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@am__objects_13 =  \
@HAVE_ELF_TRUE@@NATIVE_TRUE@	ztest_alloc-ztest.$(OBJEXT) \
@HAVE_ELF_TRUE@@NATIVE_TRUE@	ztest_alloc-testlib.$(OBJEXT)
@HAVE_ELF_TRUE@@NATIVE_TRUE@am_ztest_alloc_OBJECTS =  \
-@HAVE_ELF_TRUE@@NATIVE_TRUE@	$(am__objects_12)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@	$(am__objects_13)
 ztest_alloc_OBJECTS = $(am_ztest_alloc_OBJECTS)
@HAVE_ELF_TRUE@@NATIVE_TRUE@ztest_alloc_DEPENDENCIES =  \
@HAVE_ELF_TRUE@@NATIVE_TRUE@	libbacktrace_alloc.la \
@ -530,13 +562,14 @@ SOURCES = $(libbacktrace_la_SOURCES) $(EXTRA_libbacktrace_la_SOURCES) \
 	$(ctesta_alloc_SOURCES) $(ctestg_SOURCES) \
 	$(ctestg_alloc_SOURCES) $(dwarf5_SOURCES) \
 	$(dwarf5_alloc_SOURCES) $(edtest_SOURCES) \
-	$(edtest_alloc_SOURCES) $(stest_SOURCES) \
+	$(edtest_alloc_SOURCES) $(mtest_SOURCES) $(stest_SOURCES) \
 	$(stest_alloc_SOURCES) $(test_elf_32_SOURCES) \
 	$(test_elf_64_SOURCES) $(test_macho_SOURCES) \
 	$(test_pecoff_SOURCES) $(test_unknown_SOURCES) \
 	$(test_xcoff_32_SOURCES) $(test_xcoff_64_SOURCES) \
 	$(ttest_SOURCES) $(ttest_alloc_SOURCES) $(unittest_SOURCES) \
-	$(unittest_alloc_SOURCES) $(ztest_SOURCES) \
+	$(unittest_alloc_SOURCES) $(xztest_SOURCES) \
+	$(xztest_alloc_SOURCES) $(ztest_SOURCES) \
 	$(ztest_alloc_SOURCES)
 am__can_run_installinfo = \
  case $$AM_UPDATE_INFO_DIR in \
@ -786,6 +819,7 @@ CC = @CC@
 CET_HOST_FLAGS = @CET_HOST_FLAGS@
 CFLAGS = @CFLAGS@
 CLOCK_GETTIME_LINK = @CLOCK_GETTIME_LINK@
+COMM = @COMM@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 CYGPATH_W = @CYGPATH_W@
@ -844,6 +878,7 @@ STRIP = @STRIP@
 VERSION = @VERSION@
 VIEW_FILE = @VIEW_FILE@
 WARN_FLAGS = @WARN_FLAGS@
+XZ = @XZ@
 abs_builddir = @abs_builddir@
 abs_srcdir = @abs_srcdir@
 abs_top_builddir = @abs_top_builddir@
@ -953,7 +988,8 @@ libbacktrace_la_DEPENDENCIES = $(libbacktrace_la_LIBADD)
 # Add a test to this variable if you want it to be built and run.
 BUILDTESTS = $(am__append_2) $(am__append_10) $(am__append_11) \
 	$(am__append_16) $(am__append_17) $(am__append_18) \
-	$(am__append_21) $(am__append_22)
+	$(am__append_21) $(am__append_22) $(am__append_24) \
+	$(am__append_28)

 # Add a file to this variable if you want it to be built for testing.
 check_DATA = $(am__append_5) $(am__append_19) $(am__append_23)
@ -1078,7 +1114,21 @@ libbacktrace_TEST_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) -g
@HAVE_DWARF5_TRUE@@NATIVE_TRUE@dwarf5_alloc_SOURCES = $(dwarf5_SOURCES)
@HAVE_DWARF5_TRUE@@NATIVE_TRUE@dwarf5_alloc_CFLAGS = $(dwarf5_CFLAGS)
@HAVE_DWARF5_TRUE@@NATIVE_TRUE@dwarf5_alloc_LDADD = libbacktrace_alloc.la
-CLEANFILES = $(TESTS) *.debug elf_for_test.c edtest2_build.c gen_edtest2_build
+@NATIVE_TRUE@mtest_SOURCES = mtest.c testlib.c
+@NATIVE_TRUE@mtest_CFLAGS = $(libbacktrace_TEST_CFLAGS) -O
+@NATIVE_TRUE@mtest_LDADD = libbacktrace.la
+@HAVE_ELF_TRUE@xztest_SOURCES = xztest.c testlib.c
+@HAVE_ELF_TRUE@xztest_CFLAGS = $(libbacktrace_TEST_CFLAGS) -DSRCDIR=\"$(srcdir)\"
+@HAVE_ELF_TRUE@xztest_LDADD = libbacktrace.la $(am__append_26) \
+@HAVE_ELF_TRUE@	$(CLOCK_GETTIME_LINK)
+@HAVE_ELF_TRUE@xztest_alloc_SOURCES = $(xztest_SOURCES)
+@HAVE_ELF_TRUE@xztest_alloc_CFLAGS = $(xztest_CFLAGS)
+@HAVE_ELF_TRUE@xztest_alloc_LDADD = libbacktrace_alloc.la \
+@HAVE_ELF_TRUE@	$(am__append_27) $(CLOCK_GETTIME_LINK)
+CLEANFILES = \
+	$(TESTS) *.debug elf_for_test.c edtest2_build.c gen_edtest2_build \
+	*.dsyms *.fsyms *.keepsyms *.dbg *.mdbg *.mdbg.xz *.strip
+

 # We can't use automake's automatic dependency tracking, because it
 # breaks when using bootstrap-lean.  Automatic dependency tracking
@ -1259,6 +1309,10 @@ edtest_alloc$(EXEEXT): $(edtest_alloc_OBJECTS) $(edtest_alloc_DEPENDENCIES) $(EX
 	@rm -f edtest_alloc$(EXEEXT)
 	$(AM_V_CCLD)$(edtest_alloc_LINK) $(edtest_alloc_OBJECTS) $(edtest_alloc_LDADD) $(LIBS)

+mtest$(EXEEXT): $(mtest_OBJECTS) $(mtest_DEPENDENCIES) $(EXTRA_mtest_DEPENDENCIES) 
+	@rm -f mtest$(EXEEXT)
+	$(AM_V_CCLD)$(mtest_LINK) $(mtest_OBJECTS) $(mtest_LDADD) $(LIBS)
+
 stest$(EXEEXT): $(stest_OBJECTS) $(stest_DEPENDENCIES) $(EXTRA_stest_DEPENDENCIES) 
 	@rm -f stest$(EXEEXT)
 	$(AM_V_CCLD)$(stest_LINK) $(stest_OBJECTS) $(stest_LDADD) $(LIBS)
@ -1311,6 +1365,14 @@ unittest_alloc$(EXEEXT): $(unittest_alloc_OBJECTS) $(unittest_alloc_DEPENDENCIES
 	@rm -f unittest_alloc$(EXEEXT)
 	$(AM_V_CCLD)$(unittest_alloc_LINK) $(unittest_alloc_OBJECTS) $(unittest_alloc_LDADD) $(LIBS)

+xztest$(EXEEXT): $(xztest_OBJECTS) $(xztest_DEPENDENCIES) $(EXTRA_xztest_DEPENDENCIES) 
+	@rm -f xztest$(EXEEXT)
+	$(AM_V_CCLD)$(xztest_LINK) $(xztest_OBJECTS) $(xztest_LDADD) $(LIBS)
+
+xztest_alloc$(EXEEXT): $(xztest_alloc_OBJECTS) $(xztest_alloc_DEPENDENCIES) $(EXTRA_xztest_alloc_DEPENDENCIES) 
+	@rm -f xztest_alloc$(EXEEXT)
+	$(AM_V_CCLD)$(xztest_alloc_LINK) $(xztest_alloc_OBJECTS) $(xztest_alloc_LDADD) $(LIBS)
+
 ztest$(EXEEXT): $(ztest_OBJECTS) $(ztest_DEPENDENCIES) $(EXTRA_ztest_DEPENDENCIES) 
 	@rm -f ztest$(EXEEXT)
 	$(AM_V_CCLD)$(ztest_LINK) $(ztest_OBJECTS) $(ztest_LDADD) $(LIBS)
@ -1514,6 +1576,18 @@ edtest_alloc-testlib.o: testlib.c
 edtest_alloc-testlib.obj: testlib.c
 	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(edtest_alloc_CFLAGS) $(CFLAGS) -c -o edtest_alloc-testlib.obj `if test -f 'testlib.c'; then $(CYGPATH_W) 'testlib.c'; else $(CYGPATH_W) '$(srcdir)/testlib.c'; fi`

+mtest-mtest.o: mtest.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(mtest_CFLAGS) $(CFLAGS) -c -o mtest-mtest.o `test -f 'mtest.c' || echo '$(srcdir)/'`mtest.c
+
+mtest-mtest.obj: mtest.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(mtest_CFLAGS) $(CFLAGS) -c -o mtest-mtest.obj `if test -f 'mtest.c'; then $(CYGPATH_W) 'mtest.c'; else $(CYGPATH_W) '$(srcdir)/mtest.c'; fi`
+
+mtest-testlib.o: testlib.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(mtest_CFLAGS) $(CFLAGS) -c -o mtest-testlib.o `test -f 'testlib.c' || echo '$(srcdir)/'`testlib.c
+
+mtest-testlib.obj: testlib.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(mtest_CFLAGS) $(CFLAGS) -c -o mtest-testlib.obj `if test -f 'testlib.c'; then $(CYGPATH_W) 'testlib.c'; else $(CYGPATH_W) '$(srcdir)/testlib.c'; fi`
+
 stest-stest.o: stest.c
 	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(stest_CFLAGS) $(CFLAGS) -c -o stest-stest.o `test -f 'stest.c' || echo '$(srcdir)/'`stest.c

@ -1658,6 +1732,30 @@ unittest_alloc-testlib.o: testlib.c
 unittest_alloc-testlib.obj: testlib.c
 	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(unittest_alloc_CFLAGS) $(CFLAGS) -c -o unittest_alloc-testlib.obj `if test -f 'testlib.c'; then $(CYGPATH_W) 'testlib.c'; else $(CYGPATH_W) '$(srcdir)/testlib.c'; fi`

+xztest-xztest.o: xztest.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(xztest_CFLAGS) $(CFLAGS) -c -o xztest-xztest.o `test -f 'xztest.c' || echo '$(srcdir)/'`xztest.c
+
+xztest-xztest.obj: xztest.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(xztest_CFLAGS) $(CFLAGS) -c -o xztest-xztest.obj `if test -f 'xztest.c'; then $(CYGPATH_W) 'xztest.c'; else $(CYGPATH_W) '$(srcdir)/xztest.c'; fi`
+
+xztest-testlib.o: testlib.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(xztest_CFLAGS) $(CFLAGS) -c -o xztest-testlib.o `test -f 'testlib.c' || echo '$(srcdir)/'`testlib.c
+
+xztest-testlib.obj: testlib.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(xztest_CFLAGS) $(CFLAGS) -c -o xztest-testlib.obj `if test -f 'testlib.c'; then $(CYGPATH_W) 'testlib.c'; else $(CYGPATH_W) '$(srcdir)/testlib.c'; fi`
+
+xztest_alloc-xztest.o: xztest.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(xztest_alloc_CFLAGS) $(CFLAGS) -c -o xztest_alloc-xztest.o `test -f 'xztest.c' || echo '$(srcdir)/'`xztest.c
+
+xztest_alloc-xztest.obj: xztest.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(xztest_alloc_CFLAGS) $(CFLAGS) -c -o xztest_alloc-xztest.obj `if test -f 'xztest.c'; then $(CYGPATH_W) 'xztest.c'; else $(CYGPATH_W) '$(srcdir)/xztest.c'; fi`
+
+xztest_alloc-testlib.o: testlib.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(xztest_alloc_CFLAGS) $(CFLAGS) -c -o xztest_alloc-testlib.o `test -f 'testlib.c' || echo '$(srcdir)/'`testlib.c
+
+xztest_alloc-testlib.obj: testlib.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(xztest_alloc_CFLAGS) $(CFLAGS) -c -o xztest_alloc-testlib.obj `if test -f 'testlib.c'; then $(CYGPATH_W) 'testlib.c'; else $(CYGPATH_W) '$(srcdir)/testlib.c'; fi`
+
 ztest-ztest.o: ztest.c
 	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(ztest_CFLAGS) $(CFLAGS) -c -o ztest-ztest.o `test -f 'ztest.c' || echo '$(srcdir)/'`ztest.c

@ -1933,6 +2031,13 @@ btest_gnudebuglink.log: btest_gnudebuglink
 	--log-file $$b.log --trs-file $$b.trs \
 	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
 	"$$tst" $(AM_TESTS_FD_REDIRECT)
+mtest_minidebug.log: mtest_minidebug
+	@p='mtest_minidebug'; \
+	b='mtest_minidebug'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
 test_elf_32.log: test_elf_32$(EXEEXT)
 	@p='test_elf_32$(EXEEXT)'; \
 	b='test_elf_32'; \
@ -2115,6 +2220,27 @@ dwarf5_alloc.log: dwarf5_alloc$(EXEEXT)
 	--log-file $$b.log --trs-file $$b.trs \
 	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
 	"$$tst" $(AM_TESTS_FD_REDIRECT)
+mtest.log: mtest$(EXEEXT)
+	@p='mtest$(EXEEXT)'; \
+	b='mtest'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
+xztest.log: xztest$(EXEEXT)
+	@p='xztest$(EXEEXT)'; \
+	b='xztest'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
+xztest_alloc.log: xztest_alloc$(EXEEXT)
+	@p='xztest_alloc$(EXEEXT)'; \
+	b='xztest_alloc'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
 .test.log:
 	@p='$<'; \
 	$(am__set_b); \
@ -2323,11 +2449,23 @@ uninstall-am:
@NATIVE_TRUE@	  $<
@NATIVE_TRUE@	$(OBJCOPY) --strip-debug $< $@

+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@%_minidebug: %
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@	$(NM) -D $< -P --defined-only | $(AWK) '{ print $$1 }' | sort > $<.dsyms
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@	$(NM) $< -P --defined-only | $(AWK) '{ if ($$2 == "T" || $$2 == "t" || $$2 == "D") print $$1 }' | sort > $<.fsyms
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@	$(COMM) -13 $<.dsyms $<.fsyms > $<.keepsyms
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@	$(OBJCOPY) --only-keep-debug $< $<.dbg
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@	$(OBJCOPY) -S --remove-section .gdb_index --remove-section .comment --keep-symbols=$<.keepsyms $<.dbg $<.mdbg
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@	$(OBJCOPY) --strip-all --remove-section ..comment $< $<.strip
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@	rm -f $<.mdbg.xz
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@	$(XZ) $<.mdbg
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@	$(OBJCOPY) --add-section .gnu_debugdata=$<.mdbg.xz $<.strip
+@HAVE_MINIDEBUG_TRUE@@NATIVE_TRUE@	mv $<.strip $@
+
 clean-local:
 	-rm -rf usr
 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
+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
@ -2335,6 +2473,7 @@ 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
@ -2346,6 +2485,8 @@ 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

 # GNU Make needs to see an explicit $(MAKE) variable in the command it
 # runs to enable its job server during parallel builds.  Hence the
--- a/libbacktrace/config.h.in
+++ b/libbacktrace/config.h.in
@ -46,6 +46,9 @@
   <sys/sysctl.h>. */
 #undef HAVE_KERN_PROC_ARGS

+/* Define if -llzma is available. */
+#undef HAVE_LIBLZMA
+
 /* Define to 1 if you have the <link.h> header file. */
 #undef HAVE_LINK_H

--- a/libbacktrace/configure
+++ b/libbacktrace/configure
@ -635,6 +635,16 @@ LTLIBOBJS
 LIBOBJS
 NATIVE_FALSE
 NATIVE_TRUE
+HAVE_LIBLZMA_FALSE
+HAVE_LIBLZMA_TRUE
+HAVE_MINIDEBUG_FALSE
+HAVE_MINIDEBUG_TRUE
+HAVE_COMM_FALSE
+HAVE_COMM_TRUE
+COMM
+HAVE_XZ_FALSE
+HAVE_XZ_TRUE
+XZ
 HAVE_DSYMUTIL_FALSE
 HAVE_DSYMUTIL_TRUE
 HAVE_OBJCOPY_DEBUGLINK_FALSE
@ -804,7 +814,8 @@ LIBS
 CPPFLAGS
 CPP
 OBJCOPY
-DSYMUTIL'
+DSYMUTIL
+NM'


 # Initialize some variables set by options.
@ -1460,6 +1471,7 @@ Some influential environment variables:
  CPP         C preprocessor
  OBJCOPY     location of objcopy
  DSYMUTIL    location of dsymutil
+  NM          location of nm

 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
@ -11505,7 +11517,7 @@ else
  lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
  lt_status=$lt_dlunknown
  cat > conftest.$ac_ext <<_LT_EOF
-#line 11508 "configure"
+#line 11520 "configure"
 #include "confdefs.h"

 #if HAVE_DLFCN_H
@ -11611,7 +11623,7 @@ else
  lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
  lt_status=$lt_dlunknown
  cat > conftest.$ac_ext <<_LT_EOF
-#line 11614 "configure"
+#line 11626 "configure"
 #include "confdefs.h"

 #if HAVE_DLFCN_H
@ -13857,6 +13869,196 @@ else
 fi


+
+# Extract the first word of "nm", so it can be a program name with args.
+set dummy nm; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_NM+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$NM"; then
+  ac_cv_prog_NM="$NM" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_NM="nm"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+NM=$ac_cv_prog_NM
+if test -n "$NM"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NM" >&5
+$as_echo "$NM" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+
+# Extract the first word of "xz", so it can be a program name with args.
+set dummy xz; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_XZ+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$XZ"; then
+  ac_cv_prog_XZ="$XZ" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_XZ="xz"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+XZ=$ac_cv_prog_XZ
+if test -n "$XZ"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $XZ" >&5
+$as_echo "$XZ" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+ if test "$XZ" != ""; then
+  HAVE_XZ_TRUE=
+  HAVE_XZ_FALSE='#'
+else
+  HAVE_XZ_TRUE='#'
+  HAVE_XZ_FALSE=
+fi
+
+# Extract the first word of "comm", so it can be a program name with args.
+set dummy comm; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_COMM+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$COMM"; then
+  ac_cv_prog_COMM="$COMM" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_COMM="comm"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+COMM=$ac_cv_prog_COMM
+if test -n "$COMM"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $COMM" >&5
+$as_echo "$COMM" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+ if test "$COMM" != ""; then
+  HAVE_COMM_TRUE=
+  HAVE_COMM_FALSE='#'
+else
+  HAVE_COMM_TRUE='#'
+  HAVE_COMM_FALSE=
+fi
+
+
+ if test "${with_target_subdir}" = "" -a "$FORMAT_FILE" = "elf.lo" -a "${OBJCOPY}" != "" -a "${NM}" != "" -a "${XZ}" != "" -a "${COMM}" != ""; then
+  HAVE_MINIDEBUG_TRUE=
+  HAVE_MINIDEBUG_FALSE='#'
+else
+  HAVE_MINIDEBUG_TRUE='#'
+  HAVE_MINIDEBUG_FALSE=
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for lzma_auto_decoder in -llzma" >&5
+$as_echo_n "checking for lzma_auto_decoder in -llzma... " >&6; }
+if ${ac_cv_lib_lzma_lzma_auto_decoder+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-llzma  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char lzma_auto_decoder ();
+int
+main ()
+{
+return lzma_auto_decoder ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_lzma_lzma_auto_decoder=yes
+else
+  ac_cv_lib_lzma_lzma_auto_decoder=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_lzma_lzma_auto_decoder" >&5
+$as_echo "$ac_cv_lib_lzma_lzma_auto_decoder" >&6; }
+if test "x$ac_cv_lib_lzma_lzma_auto_decoder" = xyes; then :
+
+$as_echo "#define HAVE_LIBLZMA 1" >>confdefs.h
+
+fi
+
+ if test "$ac_cv_lib_lzma_lzma_auto_decoder" = yes; then
+  HAVE_LIBLZMA_TRUE=
+  HAVE_LIBLZMA_FALSE='#'
+else
+  HAVE_LIBLZMA_TRUE='#'
+  HAVE_LIBLZMA_FALSE=
+fi
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether tests can run" >&5
 $as_echo_n "checking whether tests can run... " >&6; }
 if ${libbacktrace_cv_sys_native+:} false; then :
@ -14073,6 +14275,22 @@ if test -z "${HAVE_DSYMUTIL_TRUE}" && test -z "${HAVE_DSYMUTIL_FALSE}"; then
  as_fn_error $? "conditional \"HAVE_DSYMUTIL\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${HAVE_XZ_TRUE}" && test -z "${HAVE_XZ_FALSE}"; then
+  as_fn_error $? "conditional \"HAVE_XZ\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
+if test -z "${HAVE_COMM_TRUE}" && test -z "${HAVE_COMM_FALSE}"; then
+  as_fn_error $? "conditional \"HAVE_COMM\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
+if test -z "${HAVE_MINIDEBUG_TRUE}" && test -z "${HAVE_MINIDEBUG_FALSE}"; then
+  as_fn_error $? "conditional \"HAVE_MINIDEBUG\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
+if test -z "${HAVE_LIBLZMA_TRUE}" && test -z "${HAVE_LIBLZMA_FALSE}"; then
+  as_fn_error $? "conditional \"HAVE_LIBLZMA\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${NATIVE_TRUE}" && test -z "${NATIVE_FALSE}"; then
  as_fn_error $? "conditional \"NATIVE\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
--- a/libbacktrace/configure.ac
+++ b/libbacktrace/configure.ac
@ -512,6 +512,21 @@ AC_ARG_VAR(DSYMUTIL, [location of dsymutil])
 AC_CHECK_PROG(DSYMUTIL, dsymutil, dsymutil)
 AM_CONDITIONAL(HAVE_DSYMUTIL, test -n "${DSYMUTIL}")

+AC_ARG_VAR(NM, [location of nm])
+AC_CHECK_PROG(NM, nm, nm)
+
+AC_CHECK_PROG(XZ, xz, xz)
+AM_CONDITIONAL(HAVE_XZ, test "$XZ" != "")
+AC_CHECK_PROG(COMM, comm, comm)
+AM_CONDITIONAL(HAVE_COMM, test "$COMM" != "")
+
+AM_CONDITIONAL(HAVE_MINIDEBUG,
+  test "${with_target_subdir}" = "" -a "$FORMAT_FILE" = "elf.lo" -a "${OBJCOPY}" != "" -a "${NM}" != "" -a "${XZ}" != "" -a "${COMM}" != "")
+
+AC_CHECK_LIB([lzma], [lzma_auto_decoder],
+    [AC_DEFINE(HAVE_LIBLZMA, 1, [Define if -llzma is available.])])
+AM_CONDITIONAL(HAVE_LIBLZMA, test "$ac_cv_lib_lzma_lzma_auto_decoder" = yes)
+
 AC_CACHE_CHECK([whether tests can run],
  [libbacktrace_cv_sys_native],
  [AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 0;])],
--- a/libbacktrace/elf.c
+++ b/libbacktrace/elf.c
--- a/libbacktrace/internal.h
+++ b/libbacktrace/internal.h
@ -335,4 +335,13 @@ extern int backtrace_uncompress_zdebug (struct backtrace_state *,
 					unsigned char **uncompressed,
 					size_t *uncompressed_size);

+/* A test-only hook for elf_uncompress_lzma.  */
+
+extern int backtrace_uncompress_lzma (struct backtrace_state *,
+				      const unsigned char *compressed,
+				      size_t compressed_size,
+				      backtrace_error_callback, void *data,
+				      unsigned char **uncompressed,
+				      size_t *uncompressed_size);
+
 #endif
--- a/libbacktrace/mtest.c
+++ b/libbacktrace/mtest.c
@ -0,0 +1,401 @@
+/* mtest.c -- Minidebug test for libbacktrace library
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor, Google.
+
+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.  */
+
+/* This program tests using libbacktrace with a program that uses the
+   minidebuginfo format in a .gnu_debugdata section.  See
+   https://sourceware.org/gdb/current/onlinedocs/gdb/MiniDebugInfo.html
+   for a bit more information about minidebuginfo.  What is relevant
+   for libbacktrace is that we have just a symbol table, with no debug
+   info, so we should be able to do a function backtrace, but we can't
+   do a file/line backtrace.  */
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "backtrace.h"
+#include "backtrace-supported.h"
+
+#include "testlib.h"
+
+static int test1 (void) __attribute__ ((noinline, noclone, unused));
+static int f2 (int) __attribute__ ((noinline, noclone));
+static int f3 (int, int) __attribute__ ((noinline, noclone));
+
+/* Collected PC values.  */
+
+static uintptr_t addrs[20];
+
+/* The backtrace callback function.  This is like callback_one in
+   testlib.c, but it saves the PC also.  */
+
+static int
+callback_mtest (void *vdata, uintptr_t pc, const char *filename, int lineno,
+		const char *function)
+{
+  struct bdata *data = (struct bdata *) vdata;
+
+  if (data->index >= sizeof addrs / sizeof addrs[0])
+    {
+      fprintf (stderr, "callback_mtest: callback called too many times\n");
+      data->failed = 1;
+      return 1;
+    }
+
+  addrs[data->index] = pc;
+
+  return callback_one (vdata, pc, filename, lineno, function);
+}
+
+/* Test the backtrace function with non-inlined functions.  (We don't
+   test with inlined functions because they won't work with minidebug
+   anyhow.)  */
+
+static int
+test1 (void)
+{
+  /* Returning a value here and elsewhere avoids a tailcall which
+     would mess up the backtrace.  */
+  return f2 (__LINE__) + 1;
+}
+
+static int
+f2 (int f1line)
+{
+  return f3 (f1line, __LINE__) + 2;
+}
+
+static int
+f3 (int f1line __attribute__ ((unused)), int f2line __attribute__ ((unused)))
+{
+  struct info all[20];
+  struct bdata data;
+  int i;
+  size_t j;
+
+  data.all = &all[0];
+  data.index = 0;
+  data.max = 20;
+  data.failed = 0;
+
+  i = backtrace_full (state, 0, callback_mtest, error_callback_one, &data);
+
+  if (i != 0)
+    {
+      fprintf (stderr, "test1: unexpected return value %d\n", i);
+      data.failed = 1;
+    }
+
+  if (data.index < 3)
+    {
+      fprintf (stderr,
+	       "test1: not enough frames; got %zu, expected at least 3\n",
+	       data.index);
+      data.failed = 1;
+    }
+
+  /* When using minidebug we don't expect the function name here.  */
+
+  for (j = 0; j < 3 && j < data.index; j++)
+    {
+      if (all[j].function == NULL)
+	{
+	  struct symdata symdata;
+
+	  symdata.name = NULL;
+	  symdata.val = 0;
+	  symdata.size = 0;
+	  symdata.failed = 0;
+
+	  i = backtrace_syminfo (state, addrs[j], callback_three,
+				 error_callback_three, &symdata);
+	  if (i == 0)
+	    {
+	      fprintf (stderr,
+		       ("test1: [%zu], unexpected return value from "
+			"backtrace_syminfo %d\n"),
+		       j, i);
+	      data.failed = 1;
+	    }
+	  else if (symdata.name == NULL)
+	    {
+	      fprintf (stderr, "test1: [%zu]: syminfo did not find name\n", j);
+	      data.failed = 1;
+	    }
+	  else
+	    all[j].function = strdup (symdata.name);
+	}
+    }
+
+  if (all[0].function == NULL)
+    {
+      fprintf (stderr, "test1: [0]: missing function name\n");
+      data.failed = 1;
+    }
+  else if (strcmp (all[0].function, "f3") != 0)
+    {
+      fprintf (stderr, "test1: [0]: got %s expected %s\n",
+	       all[0].function, "f3");
+      data.failed = 1;
+    }
+
+  if (all[1].function == NULL)
+    {
+      fprintf (stderr, "test1: [1]: missing function name\n");
+      data.failed = 1;
+    }
+  else if (strcmp (all[1].function, "f2") != 0)
+    {
+      fprintf (stderr, "test1: [1]: got %s expected %s\n",
+	       all[0].function, "f2");
+      data.failed = 1;
+    }
+
+  if (all[2].function == NULL)
+    {
+      fprintf (stderr, "test1: [2]: missing function name\n");
+      data.failed = 1;
+    }
+  else if (strcmp (all[2].function, "test1") != 0)
+    {
+      fprintf (stderr, "test1: [2]: got %s expected %s\n",
+	       all[0].function, "test1");
+      data.failed = 1;
+    }
+
+  printf ("%s: backtrace_full noinline\n", data.failed ? "FAIL" : "PASS");
+
+  if (data.failed)
+    ++failures;
+
+  return failures;
+}
+
+/* Test the backtrace_simple function with non-inlined functions.  */
+
+static int test3 (void) __attribute__ ((noinline, noclone, unused));
+static int f22 (int) __attribute__ ((noinline, noclone));
+static int f23 (int, int) __attribute__ ((noinline, noclone));
+
+static int
+test3 (void)
+{
+  return f22 (__LINE__) + 1;
+}
+
+static int
+f22 (int f1line)
+{
+  return f23 (f1line, __LINE__) + 2;
+}
+
+static int
+f23 (int f1line __attribute__ ((unused)), int f2line __attribute__ ((unused)))
+{
+  uintptr_t addrs[20];
+  struct sdata data;
+  int i;
+
+  data.addrs = &addrs[0];
+  data.index = 0;
+  data.max = 20;
+  data.failed = 0;
+
+  i = backtrace_simple (state, 0, callback_two, error_callback_two, &data);
+
+  if (i != 0)
+    {
+      fprintf (stderr, "test3: unexpected return value %d\n", i);
+      data.failed = 1;
+    }
+
+  if (!data.failed)
+    {
+      int j;
+
+      for (j = 0; j < 3; ++j)
+	{
+	  struct symdata symdata;
+
+	  symdata.name = NULL;
+	  symdata.val = 0;
+	  symdata.size = 0;
+	  symdata.failed = 0;
+
+	  i = backtrace_syminfo (state, addrs[j], callback_three,
+				 error_callback_three, &symdata);
+	  if (i == 0)
+	    {
+	      fprintf (stderr,
+		       ("test3: [%d]: unexpected return value "
+			"from backtrace_syminfo %d\n"),
+		       j, i);
+	      symdata.failed = 1;
+	    }
+
+	  if (!symdata.failed)
+	    {
+	      const char *expected;
+
+	      switch (j)
+		{
+		case 0:
+		  expected = "f23";
+		  break;
+		case 1:
+		  expected = "f22";
+		  break;
+		case 2:
+		  expected = "test3";
+		  break;
+		default:
+		  assert (0);
+		}
+
+	      if (symdata.name == NULL)
+		{
+		  fprintf (stderr, "test3: [%d]: NULL syminfo name\n", j);
+		  symdata.failed = 1;
+		}
+	      /* Use strncmp, not strcmp, because GCC might create a
+		 clone.  */
+	      else if (strncmp (symdata.name, expected, strlen (expected))
+		       != 0)
+		{
+		  fprintf (stderr,
+			   ("test3: [%d]: unexpected syminfo name "
+			    "got %s expected %s\n"),
+			   j, symdata.name, expected);
+		  symdata.failed = 1;
+		}
+	    }
+
+	  if (symdata.failed)
+	    data.failed = 1;
+	}
+    }
+
+  printf ("%s: backtrace_simple noinline\n", data.failed ? "FAIL" : "PASS");
+
+  if (data.failed)
+    ++failures;
+
+  return failures;
+}
+
+int test5 (void) __attribute__ ((unused));
+
+int global = 1;
+
+int
+test5 (void)
+{
+  struct symdata symdata;
+  int i;
+  uintptr_t addr = (uintptr_t) &global;
+
+  if (sizeof (global) > 1)
+    addr += 1;
+
+  symdata.name = NULL;
+  symdata.val = 0;
+  symdata.size = 0;
+  symdata.failed = 0;
+
+  i = backtrace_syminfo (state, addr, callback_three,
+			 error_callback_three, &symdata);
+  if (i == 0)
+    {
+      fprintf (stderr,
+	       "test5: unexpected return value from backtrace_syminfo %d\n",
+	       i);
+      symdata.failed = 1;
+    }
+
+  if (!symdata.failed)
+    {
+      if (symdata.name == NULL)
+	{
+	  fprintf (stderr, "test5: NULL syminfo name\n");
+	  symdata.failed = 1;
+	}
+      else if (!(strncmp (symdata.name, "global", 6) == 0
+		 && (symdata.name[6] == '\0'|| symdata.name[6] == '.')))
+	{
+	  fprintf (stderr,
+		   "test5: unexpected syminfo name got %s expected %s\n",
+		   symdata.name, "global");
+	  symdata.failed = 1;
+	}
+      else if (symdata.val != (uintptr_t) &global)
+	{
+	  fprintf (stderr,
+		   "test5: unexpected syminfo value got %lx expected %lx\n",
+		   (unsigned long) symdata.val,
+		   (unsigned long) (uintptr_t) &global);
+	  symdata.failed = 1;
+	}
+      else if (symdata.size != sizeof (global))
+	{
+	  fprintf (stderr,
+		   "test5: unexpected syminfo size got %lx expected %lx\n",
+		   (unsigned long) symdata.size,
+		   (unsigned long) sizeof (global));
+	  symdata.failed = 1;
+	}
+    }
+
+  printf ("%s: backtrace_syminfo variable\n",
+	  symdata.failed ? "FAIL" : "PASS");
+
+  if (symdata.failed)
+    ++failures;
+
+  return failures;
+}
+
+int
+main (int argc ATTRIBUTE_UNUSED, char **argv)
+{
+  state = backtrace_create_state (argv[0], BACKTRACE_SUPPORTS_THREADS,
+				  error_callback_create, NULL);
+
+#if BACKTRACE_SUPPORTED
+  test1 ();
+  test3 ();
+#if BACKTRACE_SUPPORTS_DATA
+  test5 ();
+#endif
+#endif
+
+  exit (failures ? EXIT_FAILURE : EXIT_SUCCESS);
+}
--- a/libbacktrace/xztest.c
+++ b/libbacktrace/xztest.c
@ -0,0 +1,508 @@
+/* xztest.c -- Test for libbacktrace LZMA decoder.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor, Google.
+
+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.  */
+
+#include "config.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#ifdef HAVE_LIBLZMA
+#include <lzma.h>
+#endif
+
+#include "backtrace.h"
+#include "backtrace-supported.h"
+
+#include "internal.h"
+#include "testlib.h"
+
+#ifndef HAVE_CLOCK_GETTIME
+
+typedef int xclockid_t;
+
+static int
+xclock_gettime (xclockid_t id ATTRIBUTE_UNUSED,
+		struct timespec *ts ATTRIBUTE_UNUSED)
+{
+  errno = EINVAL;
+  return -1;
+}
+
+#define clockid_t xclockid_t
+#define clock_gettime xclock_gettime
+#undef CLOCK_REALTIME
+#define CLOCK_REALTIME 0
+
+#endif /* !defined(HAVE_CLOCK_GETTIME) */
+
+#ifdef CLOCK_PROCESS_CPUTIME_ID
+#define LIBLZMA_CLOCK_GETTIME_ARG CLOCK_PROCESS_CPUTIME_ID
+#else
+#define LIBLZMA_CLOCK_GETTIME_ARG CLOCK_REALTIME
+#endif
+
+/* Some tests for the local lzma inflation code.  */
+
+struct lzma_test
+{
+  const char *name;
+  const char *uncompressed;
+  size_t uncompressed_len;
+  const char *compressed;
+  size_t compressed_len;
+};
+
+/* Error callback.  */
+
+static void
+error_callback_compress (void *vdata ATTRIBUTE_UNUSED, const char *msg,
+			 int errnum)
+{
+  fprintf (stderr, "%s", msg);
+  if (errnum > 0)
+    fprintf (stderr, ": %s", strerror (errnum));
+  fprintf (stderr, "\n");
+  exit (EXIT_FAILURE);
+}
+
+static const struct lzma_test tests[] =
+{
+  {
+    "empty",
+    "",
+    0,
+    ("\xfd\x37\x7a\x58\x5a\x00\x00\x04\xe6\xd6\xb4\x46\x00\x00\x00\x00"
+     "\x1c\xdf\x44\x21\x1f\xb6\xf3\x7d\x01\x00\x00\x00\x00\x04\x59\x5a"),
+    32,
+  },
+  {
+    "hello",
+    "hello, world\n",
+    0,
+    ("\xfd\x37\x7a\x58\x5a\x00\x00\x04\xe6\xd6\xb4\x46\x02\x00\x21\x01"
+     "\x16\x00\x00\x00\x74\x2f\xe5\xa3\x01\x00\x0c\x68\x65\x6c\x6c\x6f"
+     "\x2c\x20\x77\x6f\x72\x6c\x64\x0a\x00\x00\x00\x00\x7b\x46\x5a\x81"
+     "\xc9\x12\xb8\xea\x00\x01\x25\x0d\x71\x19\xc4\xb6\x1f\xb6\xf3\x7d"
+     "\x01\x00\x00\x00\x00\x04\x59\x5a"),
+    72,
+  },
+  {
+    "goodbye",
+    "goodbye, world",
+    0,
+    ("\xfd\x37\x7a\x58\x5a\x00\x00\x04\xe6\xd6\xb4\x46\x02\x00\x21\x01"
+     "\x16\x00\x00\x00\x74\x2f\xe5\xa3\x01\x00\x0d\x67\x6f\x6f\x64\x62"
+     "\x79\x65\x2c\x20\x77\x6f\x72\x6c\x64\x00\x00\x00\xf6\xf8\xa3\x33"
+     "\x8c\x4e\xc9\x68\x00\x01\x26\x0e\x08\x1b\xe0\x04\x1f\xb6\xf3\x7d"
+     "\x01\x00\x00\x00\x00\x04\x59\x5a"),
+    72,
+  },
+};
+
+/* Test the hand coded samples.  */
+
+static void
+test_samples (struct backtrace_state *state)
+{
+  size_t i;
+
+  for (i = 0; i < sizeof tests / sizeof tests[0]; ++i)
+    {
+      unsigned char *uncompressed;
+      size_t uncompressed_len;
+
+      uncompressed = NULL;
+      uncompressed_len = 0;
+      if (!backtrace_uncompress_lzma (state,
+				      ((const unsigned char *)
+				       tests[i].compressed),
+				      tests[i].compressed_len,
+				      error_callback_compress, NULL,
+				      &uncompressed, &uncompressed_len))
+	{
+	  fprintf (stderr, "test %s: uncompress failed\n", tests[i].name);
+	  ++failures;
+	}
+      else
+	{
+	  size_t v;
+
+	  v = tests[i].uncompressed_len;
+	  if (v == 0)
+	    v = strlen (tests[i].uncompressed);
+	  if (uncompressed_len != v)
+	    {
+	      fprintf (stderr,
+		       "test %s: got uncompressed length %zu, want %zu\n",
+		       tests[i].name, uncompressed_len, v);
+	      ++failures;
+	    }
+	  else if (memcmp (tests[i].uncompressed, uncompressed, v) != 0)
+	    {
+	      size_t j;
+
+	      fprintf (stderr, "test %s: uncompressed data mismatch\n",
+		       tests[i].name);
+	      for (j = 0; j < v; ++j)
+		if (tests[i].uncompressed[j] != uncompressed[j])
+		  fprintf (stderr, "  %zu: got %#x want %#x\n", j,
+			   uncompressed[j], tests[i].uncompressed[j]);
+	      ++failures;
+	    }
+	  else
+	    printf ("PASS: lzma %s\n", tests[i].name);
+
+	  backtrace_free (state, uncompressed, uncompressed_len,
+			  error_callback_compress, NULL);
+	}
+    }
+}
+
+#if HAVE_LIBLZMA
+
+/* Given a set of TRIALS timings, discard the lowest and highest
+   values and return the mean average of the rest.  */
+
+static size_t
+average_time (const size_t *times, size_t trials)
+{
+  size_t imax;
+  size_t max;
+  size_t imin;
+  size_t min;
+  size_t i;
+  size_t sum;
+
+  imin = 0;
+  imax = 0;
+  min = times[0];
+  max = times[0];
+  for (i = 1; i < trials; ++i)
+    {
+      if (times[i] < min)
+	{
+	  imin = i;
+	  min = times[i];
+	}
+      if (times[i] > max)
+	{
+	  imax = i;
+	  max = times[i];
+	}
+    }
+
+  sum = 0;
+  for (i = 0; i < trials; ++i)
+    {
+      if (i != imax && i != imin)
+	sum += times[i];
+    }
+  return sum / (trials - 2);
+}
+
+#endif
+
+/* Test a larger text, if available.  */
+
+static void
+test_large (struct backtrace_state *state ATTRIBUTE_UNUSED)
+{
+#if HAVE_LIBLZMA
+  unsigned char *orig_buf;
+  size_t orig_bufsize;
+  size_t i;
+  lzma_stream initial_stream = LZMA_STREAM_INIT;
+  lzma_stream stream;
+  unsigned char *compressed_buf;
+  size_t compressed_bufsize;
+  unsigned char *uncompressed_buf;
+  size_t uncompressed_bufsize;
+  unsigned char *spare_buf;
+  int r;
+  clockid_t cid;
+  struct timespec ts1;
+  struct timespec ts2;
+  size_t ctime;
+  size_t ztime;
+  const size_t trials = 16;
+  size_t ctimes[16];
+  size_t ztimes[16];
+  static const char * const names[] = {
+    "Isaac.Newton-Opticks.txt",
+    "../libgo/go/testdata/Isaac.Newton-Opticks.txt",
+  };
+
+  orig_buf = NULL;
+  orig_bufsize = 0;
+  uncompressed_buf = NULL;
+  compressed_buf = NULL;
+
+  for (i = 0; i < sizeof names / sizeof names[0]; ++i)
+    {
+      size_t len;
+      char *namebuf;
+      FILE *e;
+      struct stat st;
+      char *rbuf;
+      size_t got;
+
+      len = strlen (SRCDIR) + strlen (names[i]) + 2;
+      namebuf = malloc (len);
+      if (namebuf == NULL)
+	{
+	  perror ("malloc");
+	  goto fail;
+	}
+      snprintf (namebuf, len, "%s/%s", SRCDIR, names[i]);
+      e = fopen (namebuf, "r");
+      free (namebuf);
+      if (e == NULL)
+	continue;
+      if (fstat (fileno (e), &st) < 0)
+	{
+	  perror ("fstat");
+	  fclose (e);
+	  continue;
+	}
+      rbuf = malloc (st.st_size);
+      if (rbuf == NULL)
+	{
+	  perror ("malloc");
+	  goto fail;
+	}
+      got = fread (rbuf, 1, st.st_size, e);
+      fclose (e);
+      if (got > 0)
+	{
+	  orig_buf = (unsigned char *) rbuf;
+	  orig_bufsize = got;
+	  break;
+	}
+      free (rbuf);
+    }
+
+  if (orig_buf == NULL)
+    {
+      /* We couldn't find an input file.  */
+      printf ("UNSUPPORTED: lzma large\n");
+      return;
+    }
+
+  stream = initial_stream;
+  r =  lzma_easy_encoder (&stream, 6, LZMA_CHECK_CRC32);
+  if (r != LZMA_OK)
+    {
+      fprintf (stderr, "lzma_easy_encoder failed: %d\n", r);
+      goto fail;
+    }
+
+  compressed_bufsize = orig_bufsize + 100;
+  compressed_buf = malloc (compressed_bufsize);
+  if (compressed_buf == NULL)
+    {
+      perror ("malloc");
+      goto fail;
+    }
+
+  stream.next_in = orig_buf;
+  stream.avail_in = orig_bufsize;
+  stream.next_out = compressed_buf;
+  stream.avail_out = compressed_bufsize;
+
+  do
+    {
+      r = lzma_code (&stream, LZMA_FINISH);
+      if (r != LZMA_OK && r != LZMA_STREAM_END)
+	{
+	  fprintf (stderr, "lzma_code failed: %d\n", r);
+	  goto fail;
+	}
+    }
+  while (r != LZMA_STREAM_END);
+
+  compressed_bufsize = stream.total_out;
+
+  if (!backtrace_uncompress_lzma (state, (unsigned char *) compressed_buf,
+				  compressed_bufsize,
+				  error_callback_compress, NULL,
+				  &uncompressed_buf, &uncompressed_bufsize))
+    {
+      fprintf (stderr, "lzma large: backtrace_uncompress_lzma failed\n");
+      goto fail;
+    }
+
+  if (uncompressed_bufsize != orig_bufsize)
+    {
+      fprintf (stderr,
+	       "lzma large: got uncompressed length %zu, want %zu\n",
+	       uncompressed_bufsize, orig_bufsize);
+      goto fail;
+    }
+
+  if (memcmp (uncompressed_buf, orig_buf, uncompressed_bufsize) != 0)
+    {
+      fprintf (stderr, "lzma large: uncompressed data mismatch\n");
+      goto fail;
+    }
+
+  printf ("PASS: lzma large\n");
+
+  spare_buf = malloc (orig_bufsize);
+  if (spare_buf == NULL)
+    {
+      perror ("malloc");
+      goto fail;
+    }
+
+  for (i = 0; i < trials; ++i)
+    {
+      cid = LIBLZMA_CLOCK_GETTIME_ARG;
+      if (clock_gettime (cid, &ts1) < 0)
+	{
+	  if (errno == EINVAL)
+	    return;
+	  perror ("clock_gettime");
+	  return;
+	}
+
+      if (!backtrace_uncompress_lzma (state,
+				      (unsigned char *) compressed_buf,
+				      compressed_bufsize,
+				      error_callback_compress, NULL,
+				      &uncompressed_buf,
+				      &uncompressed_bufsize))
+	{
+	  fprintf (stderr,
+		   ("lzma large: "
+		    "benchmark backtrace_uncompress_lzma failed\n"));
+	  return;
+	}
+
+      if (clock_gettime (cid, &ts2) < 0)
+	{
+	  perror ("clock_gettime");
+	  return;
+	}
+
+      ctime = (ts2.tv_sec - ts1.tv_sec) * 1000000000;
+      ctime += ts2.tv_nsec - ts1.tv_nsec;
+      ctimes[i] = ctime;
+
+      stream = initial_stream;
+
+      r = lzma_auto_decoder (&stream, UINT64_MAX, 0);
+      if (r != LZMA_OK)
+	{
+	  fprintf (stderr, "lzma_stream_decoder failed: %d\n", r);
+	  goto fail;
+	}
+
+      stream.next_in = compressed_buf;
+      stream.avail_in = compressed_bufsize;
+      stream.next_out = spare_buf;
+      stream.avail_out = orig_bufsize;
+
+      if (clock_gettime (cid, &ts1) < 0)
+	{
+	  perror("clock_gettime");
+	  return;
+	}
+
+      do
+	{
+	  r = lzma_code (&stream, LZMA_FINISH);
+	  if (r != LZMA_OK && r != LZMA_STREAM_END)
+	    {
+	      fprintf (stderr, "lzma_code failed: %d\n", r);
+	      goto fail;
+	    }
+	}
+      while (r != LZMA_STREAM_END);
+
+      if (clock_gettime (cid, &ts2) < 0)
+	{
+	  perror ("clock_gettime");
+	  return;
+	}
+
+      ztime = (ts2.tv_sec - ts1.tv_sec) * 1000000000;
+      ztime += ts2.tv_nsec - ts1.tv_nsec;
+      ztimes[i] = ztime;
+    }
+
+  /* Toss the highest and lowest times and average the rest.  */
+  ctime = average_time (ctimes, trials);
+  ztime = average_time (ztimes, trials);
+
+  printf ("backtrace: %zu ns\n", ctime);
+  printf ("liblzma  : %zu ns\n", ztime);
+  printf ("ratio    : %g\n", (double) ztime / (double) ctime);
+
+  return;
+
+ fail:
+  printf ("FAIL: lzma large\n");
+  ++failures;
+
+  if (orig_buf != NULL)
+    free (orig_buf);
+  if (compressed_buf != NULL)
+    free (compressed_buf);
+  if (uncompressed_buf != NULL)
+    free (uncompressed_buf);
+
+#else /* !HAVE_LIBLZMA */
+
+ printf ("UNSUPPORTED: lzma large\n");
+
+#endif /* !HAVE_LIBLZMA */
+}
+
+int
+main (int argc ATTRIBUTE_UNUSED, char **argv)
+{
+  struct backtrace_state *state;
+
+  state = backtrace_create_state (argv[0], BACKTRACE_SUPPORTS_THREADS,
+				  error_callback_create, NULL);
+
+  test_samples (state);
+  test_large (state);
+
+  exit (failures != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
+}