On 25-01-19 18:15, Nathan Sidwell wrote:
> On 1/25/19 5:28 AM, Tom de Vries wrote:
>>
>> This patch fixes it by passing "" instead of NULL, in the call to
>> elf_add at line 3083 (for .gnu_debugaltlink), not the call to elf_add at
>> line 3044 (for .gnu_debuglink) mentioned above.
>>
>> Nathan, does this fix the problem for you? If not, can you provide a
>> reproducer, or give a hint on how one could be constructed?
>
> I still hit the problem, and am installing this as sufficiently obvious.
> I'm on a fedora system debugging pr88995. The debuglink_name is
> "../../.dwz/isl-0.16.1-7.fc29.x86_64"
>
I've managed to reproduce this segfault instance by adding a test-case
that uses both build-id and dwz.
OK for trunk?
Thanks,
- Tom
[libbacktrace] Add test-cases exercising build-id and dwz
Add test-cases b2test_buildid and b3test_dwz_buildid.
The last one triggers the segfault fixed by "[backtrace] Avoid segfault"
( r268275 ).
2019-01-27 Tom de Vries <tdevr...@suse.de>
* Makefile.am (check_PROGRAMS): Add b2test and b3test.
(TESTS): Add b2test_buildid, b3test_dwz and b3test_dwz_buildid.
* Makefile.in: Regenerate.
* configure.ac (HAVE_ELF): Set with AM_CONDITIONAL.
* configure: Regenerate.
* elf.c (SYSTEM_BUILD_ID_DIR): Factor out of ...
(elf_open_debugfile_by_buildid): ... here.
---
libbacktrace/Makefile.am | 53 +++++++++++
libbacktrace/Makefile.in | 223 ++++++++++++++++++++++++++++++++++++++--------
libbacktrace/configure | 18 +++-
libbacktrace/configure.ac | 1 +
libbacktrace/elf.c | 4 +-
5 files changed, 257 insertions(+), 42 deletions(-)
diff --git a/libbacktrace/Makefile.am b/libbacktrace/Makefile.am
index 997a535dff4..becba1ae1f0 100644
--- a/libbacktrace/Makefile.am
+++ b/libbacktrace/Makefile.am
@@ -103,6 +103,25 @@ libbacktrace_noformat_la_LIBADD = $(BACKTRACE_FILE) $(VIEW_FILE) $(ALLOC_FILE)
libbacktrace_noformat_la_DEPENDENCIES = $(libbacktrace_noformat_la_LIBADD)
+if HAVE_ELF
+
+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
+ PWD=$$(pwd -P); \
+ BUILD_ID_DIR="usr/lib/debug/.build-id/"; \
+ SEARCH='#define SYSTEM_BUILD_ID_DIR'; \
+ REPLACE="#define SYSTEM_BUILD_ID_DIR \"$$PWD/$$BUILD_ID_DIR\""; \
+ $(SED) "s%^$$SEARCH.*\$$%$$REPLACE%" \
+ $< \
+ > $@
+
+endif HAVE_ELF
+
xcoff_%.c: xcoff.c
SEARCH='#error "Unknown BACKTRACE_XCOFF_SIZE"'; \
REPLACE='#undef BACKTRACE_XCOFF_SIZE\
@@ -166,6 +185,30 @@ allocfail.sh: allocfail
TESTS += allocfail.sh
+if HAVE_ELF
+
+b2test_SOURCES = $(btest_SOURCES)
+b2test_CFLAGS = $(btest_CFLAGS)
+b2test_LDADD = libbacktrace_elf_for_test.la
+
+# The file b2test_buildid is an objcopy of b2test, so these programs share the
+# same build-id. The first time b2test is run, there's no corresponding debug
+# file at ./usr/lib/debug/.build-id/aa/bb..zz.debug. The second time b2test is
+# run, the .debug file has been created for b2test_buildid, which is now picked
+# up by b2test as well.
+check_PROGRAMS += b2test
+TESTS += b2test_buildid
+
+b3test_SOURCES = $(btest_SOURCES)
+b3test_CFLAGS = $(btest_CFLAGS)
+b3test_LDADD = libbacktrace_elf_for_test.la
+
+# These programs share the same build-id. See b2test for more details.
+check_PROGRAMS += b3test
+TESTS += b3test_dwz b3test_dwz_buildid
+
+endif HAVE_ELF
+
btest_SOURCES = btest.c testlib.c
btest_CFLAGS = $(AM_CFLAGS) -g -O
btest_LDADD = libbacktrace.la
@@ -269,6 +312,16 @@ TESTS += btest_gnudebuglink
endif HAVE_OBJCOPY_DEBUGLINK
+%_buildid: %
+ buildid=$$(readelf -n $< | grep "Build ID" | $(AWK) '{print $$3}'); \
+ prefix=$$(echo $$buildid | $(SED) 's/.//3g'); \
+ remainder=$$(echo $$buildid | $(SED) 's/^.\{2\}//'); \
+ pwd=$$(pwd -P); \
+ dir=$$pwd/usr/lib/debug/.build-id; \
+ mkdir -p $$dir/$$prefix; \
+ $(OBJCOPY) --only-keep-debug $< $$dir/$$prefix/$$remainder.debug
+ $(OBJCOPY) --strip-debug $< $@
+
if HAVE_COMPRESSED_DEBUG
ctestg_SOURCES = btest.c testlib.c
diff --git a/libbacktrace/Makefile.in b/libbacktrace/Makefile.in
index f04577066f8..1d84b67d0d5 100644
--- a/libbacktrace/Makefile.in
+++ b/libbacktrace/Makefile.in
@@ -120,19 +120,33 @@ POST_UNINSTALL = :
build_triplet = @build@
host_triplet = @host@
target_triplet = @target@
-check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3)
-@NATIVE_TRUE@am__append_1 = test_elf test_xcoff_32 test_xcoff_64 \
+check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
+ $(am__EXEEXT_4) $(am__EXEEXT_5)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@am__append_1 = libbacktrace_elf_for_test.la
+@NATIVE_TRUE@am__append_2 = test_elf test_xcoff_32 test_xcoff_64 \
@NATIVE_TRUE@ test_pecoff test_unknown unittest unittest_alloc \
-@NATIVE_TRUE@ allocfail btest btest_alloc stest stest_alloc \
-@NATIVE_TRUE@ ztest ztest_alloc edtest edtest_alloc
-@NATIVE_TRUE@am__append_2 = allocfail.sh
-@HAVE_DWZ_TRUE@@NATIVE_TRUE@am__append_3 = btest_dwz
-@HAVE_DWZ_TRUE@@HAVE_OBJCOPY_DEBUGLINK_TRUE@@NATIVE_TRUE@am__append_4 = btest_dwz_gnudebuglink
-@HAVE_ZLIB_TRUE@@NATIVE_TRUE@am__append_5 = -lz
-@HAVE_ZLIB_TRUE@@NATIVE_TRUE@am__append_6 = -lz
-@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@am__append_7 = ttest ttest_alloc
-@HAVE_OBJCOPY_DEBUGLINK_TRUE@@NATIVE_TRUE@am__append_8 = btest_gnudebuglink
-@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@am__append_9 = ctestg ctesta \
+@NATIVE_TRUE@ allocfail
+@NATIVE_TRUE@am__append_3 = allocfail.sh
+
+# The file b2test_buildid is an objcopy of b2test, so these programs share the
+# same build-id. The first time b2test is run, there's no corresponding debug
+# file at ./usr/lib/debug/.build-id/aa/bb..zz.debug. The second time b2test is
+# run, the .debug file has been created for b2test_buildid, which is now picked
+# up by b2test as well.
+
+# These programs share the same build-id. See b2test for more details.
+@HAVE_ELF_TRUE@@NATIVE_TRUE@am__append_4 = b2test b3test
+@HAVE_ELF_TRUE@@NATIVE_TRUE@am__append_5 = b2test_buildid b3test_dwz \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ b3test_dwz_buildid
+@NATIVE_TRUE@am__append_6 = btest btest_alloc stest stest_alloc ztest \
+@NATIVE_TRUE@ ztest_alloc edtest edtest_alloc
+@HAVE_DWZ_TRUE@@NATIVE_TRUE@am__append_7 = btest_dwz
+@HAVE_DWZ_TRUE@@HAVE_OBJCOPY_DEBUGLINK_TRUE@@NATIVE_TRUE@am__append_8 = btest_dwz_gnudebuglink
+@HAVE_ZLIB_TRUE@@NATIVE_TRUE@am__append_9 = -lz
+@HAVE_ZLIB_TRUE@@NATIVE_TRUE@am__append_10 = -lz
+@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@am__append_11 = ttest ttest_alloc
+@HAVE_OBJCOPY_DEBUGLINK_TRUE@@NATIVE_TRUE@am__append_12 = btest_gnudebuglink
+@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@am__append_13 = ctestg ctesta \
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ ctestg_alloc \
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ ctesta_alloc
subdir = .
@@ -172,6 +186,16 @@ am__objects_1 = atomic.lo dwarf.lo fileline.lo posix.lo print.lo \
@NATIVE_TRUE@am_libbacktrace_alloc_la_OBJECTS = $(am__objects_1)
libbacktrace_alloc_la_OBJECTS = $(am_libbacktrace_alloc_la_OBJECTS)
@NATIVE_TRUE@am_libbacktrace_alloc_la_rpath =
+@HAVE_ELF_TRUE@@NATIVE_TRUE@libbacktrace_elf_for_test_la_DEPENDENCIES = \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ $(am__DEPENDENCIES_1) \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ elf_for_test.lo \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ $(am__DEPENDENCIES_1) \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ $(am__DEPENDENCIES_1)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@am_libbacktrace_elf_for_test_la_OBJECTS = \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ $(am__objects_1)
+libbacktrace_elf_for_test_la_OBJECTS = \
+ $(am_libbacktrace_elf_for_test_la_OBJECTS)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@am_libbacktrace_elf_for_test_la_rpath =
@NATIVE_TRUE@am_libbacktrace_instrumented_alloc_la_OBJECTS = \
@NATIVE_TRUE@ $(am__objects_1)
libbacktrace_instrumented_alloc_la_OBJECTS = \
@@ -184,14 +208,16 @@ libbacktrace_noformat_la_OBJECTS = \
@NATIVE_TRUE@am__EXEEXT_1 = test_elf$(EXEEXT) test_xcoff_32$(EXEEXT) \
@NATIVE_TRUE@ test_xcoff_64$(EXEEXT) test_pecoff$(EXEEXT) \
@NATIVE_TRUE@ test_unknown$(EXEEXT) unittest$(EXEEXT) \
-@NATIVE_TRUE@ unittest_alloc$(EXEEXT) allocfail$(EXEEXT) \
-@NATIVE_TRUE@ btest$(EXEEXT) btest_alloc$(EXEEXT) \
+@NATIVE_TRUE@ unittest_alloc$(EXEEXT) allocfail$(EXEEXT)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@am__EXEEXT_2 = b2test$(EXEEXT) \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ b3test$(EXEEXT)
+@NATIVE_TRUE@am__EXEEXT_3 = btest$(EXEEXT) btest_alloc$(EXEEXT) \
@NATIVE_TRUE@ stest$(EXEEXT) stest_alloc$(EXEEXT) \
@NATIVE_TRUE@ ztest$(EXEEXT) ztest_alloc$(EXEEXT) \
@NATIVE_TRUE@ edtest$(EXEEXT) edtest_alloc$(EXEEXT)
-@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@am__EXEEXT_2 = ttest$(EXEEXT) \
+@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@am__EXEEXT_4 = ttest$(EXEEXT) \
@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@ ttest_alloc$(EXEEXT)
-@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@am__EXEEXT_3 = \
+@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@am__EXEEXT_5 = \
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ ctestg$(EXEEXT) \
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ ctesta$(EXEEXT) \
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ ctestg_alloc$(EXEEXT) \
@@ -201,6 +227,24 @@ libbacktrace_noformat_la_OBJECTS = \
allocfail_OBJECTS = $(am_allocfail_OBJECTS)
@NATIVE_TRUE@allocfail_DEPENDENCIES = \
@NATIVE_TRUE@ libbacktrace_instrumented_alloc.la
+@NATIVE_TRUE@am__objects_2 = b2test-btest.$(OBJEXT) \
+@NATIVE_TRUE@ b2test-testlib.$(OBJEXT)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@am_b2test_OBJECTS = $(am__objects_2)
+b2test_OBJECTS = $(am_b2test_OBJECTS)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@b2test_DEPENDENCIES = \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ libbacktrace_elf_for_test.la
+b2test_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+ $(LIBTOOLFLAGS) --mode=link $(CCLD) $(b2test_CFLAGS) $(CFLAGS) \
+ $(AM_LDFLAGS) $(LDFLAGS) -o $@
+@NATIVE_TRUE@am__objects_3 = b3test-btest.$(OBJEXT) \
+@NATIVE_TRUE@ b3test-testlib.$(OBJEXT)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@am_b3test_OBJECTS = $(am__objects_3)
+b3test_OBJECTS = $(am_b3test_OBJECTS)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@b3test_DEPENDENCIES = \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ libbacktrace_elf_for_test.la
+b3test_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+ $(LIBTOOLFLAGS) --mode=link $(CCLD) $(b3test_CFLAGS) $(CFLAGS) \
+ $(AM_LDFLAGS) $(LDFLAGS) -o $@
@NATIVE_TRUE@am_btest_OBJECTS = btest-btest.$(OBJEXT) \
@NATIVE_TRUE@ btest-testlib.$(OBJEXT)
btest_OBJECTS = $(am_btest_OBJECTS)
@@ -208,9 +252,9 @@ btest_OBJECTS = $(am_btest_OBJECTS)
btest_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
$(LIBTOOLFLAGS) --mode=link $(CCLD) $(btest_CFLAGS) $(CFLAGS) \
$(AM_LDFLAGS) $(LDFLAGS) -o $@
-@NATIVE_TRUE@am__objects_2 = btest_alloc-btest.$(OBJEXT) \
+@NATIVE_TRUE@am__objects_4 = btest_alloc-btest.$(OBJEXT) \
@NATIVE_TRUE@ btest_alloc-testlib.$(OBJEXT)
-@NATIVE_TRUE@am_btest_alloc_OBJECTS = $(am__objects_2)
+@NATIVE_TRUE@am_btest_alloc_OBJECTS = $(am__objects_4)
btest_alloc_OBJECTS = $(am_btest_alloc_OBJECTS)
@NATIVE_TRUE@btest_alloc_DEPENDENCIES = libbacktrace_alloc.la
btest_alloc_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
@@ -224,10 +268,10 @@ ctesta_OBJECTS = $(am_ctesta_OBJECTS)
ctesta_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
$(LIBTOOLFLAGS) --mode=link $(CCLD) $(ctesta_CFLAGS) $(CFLAGS) \
$(ctesta_LDFLAGS) $(LDFLAGS) -o $@
-@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@am__objects_3 = ctesta_alloc-btest.$(OBJEXT) \
+@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@am__objects_5 = ctesta_alloc-btest.$(OBJEXT) \
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ ctesta_alloc-testlib.$(OBJEXT)
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@am_ctesta_alloc_OBJECTS = \
-@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ $(am__objects_3)
+@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ $(am__objects_5)
ctesta_alloc_OBJECTS = $(am_ctesta_alloc_OBJECTS)
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ctesta_alloc_DEPENDENCIES = libbacktrace_alloc.la
ctesta_alloc_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
@@ -241,10 +285,10 @@ ctestg_OBJECTS = $(am_ctestg_OBJECTS)
ctestg_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
$(LIBTOOLFLAGS) --mode=link $(CCLD) $(ctestg_CFLAGS) $(CFLAGS) \
$(ctestg_LDFLAGS) $(LDFLAGS) -o $@
-@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@am__objects_4 = ctestg_alloc-btest.$(OBJEXT) \
+@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@am__objects_6 = ctestg_alloc-btest.$(OBJEXT) \
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ ctestg_alloc-testlib.$(OBJEXT)
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@am_ctestg_alloc_OBJECTS = \
-@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ $(am__objects_4)
+@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ $(am__objects_6)
ctestg_alloc_OBJECTS = $(am_ctestg_alloc_OBJECTS)
@HAVE_COMPRESSED_DEBUG_TRUE@@NATIVE_TRUE@ctestg_alloc_DEPENDENCIES = libbacktrace_alloc.la
ctestg_alloc_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
@@ -254,16 +298,16 @@ ctestg_alloc_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
@NATIVE_TRUE@ edtest2_build.$(OBJEXT) testlib.$(OBJEXT)
edtest_OBJECTS = $(am_edtest_OBJECTS)
@NATIVE_TRUE@edtest_DEPENDENCIES = libbacktrace.la
-@NATIVE_TRUE@am__objects_5 = edtest.$(OBJEXT) edtest2_build.$(OBJEXT) \
+@NATIVE_TRUE@am__objects_7 = edtest.$(OBJEXT) edtest2_build.$(OBJEXT) \
@NATIVE_TRUE@ testlib.$(OBJEXT)
-@NATIVE_TRUE@am_edtest_alloc_OBJECTS = $(am__objects_5)
+@NATIVE_TRUE@am_edtest_alloc_OBJECTS = $(am__objects_7)
edtest_alloc_OBJECTS = $(am_edtest_alloc_OBJECTS)
@NATIVE_TRUE@edtest_alloc_DEPENDENCIES = libbacktrace_alloc.la
@NATIVE_TRUE@am_stest_OBJECTS = stest.$(OBJEXT)
stest_OBJECTS = $(am_stest_OBJECTS)
@NATIVE_TRUE@stest_DEPENDENCIES = libbacktrace.la
-@NATIVE_TRUE@am__objects_6 = stest.$(OBJEXT)
-@NATIVE_TRUE@am_stest_alloc_OBJECTS = $(am__objects_6)
+@NATIVE_TRUE@am__objects_8 = stest.$(OBJEXT)
+@NATIVE_TRUE@am_stest_alloc_OBJECTS = $(am__objects_8)
stest_alloc_OBJECTS = $(am_stest_alloc_OBJECTS)
@NATIVE_TRUE@stest_alloc_DEPENDENCIES = libbacktrace_alloc.la
@NATIVE_TRUE@am_test_elf_OBJECTS = test_format.$(OBJEXT) \
@@ -298,11 +342,11 @@ ttest_OBJECTS = $(am_ttest_OBJECTS)
ttest_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
$(LIBTOOLFLAGS) --mode=link $(CCLD) $(ttest_CFLAGS) $(CFLAGS) \
$(AM_LDFLAGS) $(LDFLAGS) -o $@
-@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@am__objects_7 = \
+@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@am__objects_9 = \
@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@ ttest_alloc-ttest.$(OBJEXT) \
@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@ ttest_alloc-testlib.$(OBJEXT)
@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@am_ttest_alloc_OBJECTS = \
-@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@ $(am__objects_7)
+@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@ $(am__objects_9)
ttest_alloc_OBJECTS = $(am_ttest_alloc_OBJECTS)
@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@ttest_alloc_DEPENDENCIES = \
@HAVE_PTHREAD_TRUE@@NATIVE_TRUE@ libbacktrace_alloc.la
@@ -313,8 +357,8 @@ ttest_alloc_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
@NATIVE_TRUE@ testlib.$(OBJEXT)
unittest_OBJECTS = $(am_unittest_OBJECTS)
@NATIVE_TRUE@unittest_DEPENDENCIES = libbacktrace.la
-@NATIVE_TRUE@am__objects_8 = unittest.$(OBJEXT) testlib.$(OBJEXT)
-@NATIVE_TRUE@am_unittest_alloc_OBJECTS = $(am__objects_8)
+@NATIVE_TRUE@am__objects_10 = unittest.$(OBJEXT) testlib.$(OBJEXT)
+@NATIVE_TRUE@am_unittest_alloc_OBJECTS = $(am__objects_10)
unittest_alloc_OBJECTS = $(am_unittest_alloc_OBJECTS)
@NATIVE_TRUE@unittest_alloc_DEPENDENCIES = libbacktrace_alloc.la
@NATIVE_TRUE@am_ztest_OBJECTS = ztest-ztest.$(OBJEXT) \
@@ -325,9 +369,9 @@ 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 $@
-@NATIVE_TRUE@am__objects_9 = ztest_alloc-ztest.$(OBJEXT) \
+@NATIVE_TRUE@am__objects_11 = ztest_alloc-ztest.$(OBJEXT) \
@NATIVE_TRUE@ ztest_alloc-testlib.$(OBJEXT)
-@NATIVE_TRUE@am_ztest_alloc_OBJECTS = $(am__objects_9)
+@NATIVE_TRUE@am_ztest_alloc_OBJECTS = $(am__objects_11)
ztest_alloc_OBJECTS = $(am_ztest_alloc_OBJECTS)
@NATIVE_TRUE@ztest_alloc_DEPENDENCIES = libbacktrace_alloc.la \
@NATIVE_TRUE@ $(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1)
@@ -369,9 +413,11 @@ am__v_CCLD_0 = @echo " CCLD " $@;
am__v_CCLD_1 =
SOURCES = $(libbacktrace_la_SOURCES) $(EXTRA_libbacktrace_la_SOURCES) \
$(libbacktrace_alloc_la_SOURCES) \
+ $(libbacktrace_elf_for_test_la_SOURCES) \
$(libbacktrace_instrumented_alloc_la_SOURCES) \
$(libbacktrace_noformat_la_SOURCES) $(allocfail_SOURCES) \
- $(btest_SOURCES) $(btest_alloc_SOURCES) $(ctesta_SOURCES) \
+ $(b2test_SOURCES) $(b3test_SOURCES) $(btest_SOURCES) \
+ $(btest_alloc_SOURCES) $(ctesta_SOURCES) \
$(ctesta_alloc_SOURCES) $(ctestg_SOURCES) \
$(ctestg_alloc_SOURCES) $(edtest_SOURCES) \
$(edtest_alloc_SOURCES) $(stest_SOURCES) \
@@ -789,10 +835,10 @@ libbacktrace_la_LIBADD = \
$(ALLOC_FILE)
libbacktrace_la_DEPENDENCIES = $(libbacktrace_la_LIBADD)
-TESTS = $(check_PROGRAMS) $(am__append_2) $(am__append_3) \
- $(am__append_4) $(am__append_8)
+TESTS = $(check_PROGRAMS) $(am__append_3) $(am__append_5) \
+ $(am__append_7) $(am__append_8) $(am__append_12)
@NATIVE_TRUE@check_LTLIBRARIES = libbacktrace_alloc.la \
-@NATIVE_TRUE@ libbacktrace_noformat.la \
+@NATIVE_TRUE@ libbacktrace_noformat.la $(am__append_1) \
@NATIVE_TRUE@ libbacktrace_instrumented_alloc.la
@NATIVE_TRUE@libbacktrace_alloc_la_SOURCES = $(libbacktrace_la_SOURCES)
@NATIVE_TRUE@libbacktrace_alloc_la_LIBADD = $(BACKTRACE_FILE) $(FORMAT_FILE) read.lo alloc.lo
@@ -800,6 +846,10 @@ TESTS = $(check_PROGRAMS) $(am__append_2) $(am__append_3) \
@NATIVE_TRUE@libbacktrace_noformat_la_SOURCES = $(libbacktrace_la_SOURCES)
@NATIVE_TRUE@libbacktrace_noformat_la_LIBADD = $(BACKTRACE_FILE) $(VIEW_FILE) $(ALLOC_FILE)
@NATIVE_TRUE@libbacktrace_noformat_la_DEPENDENCIES = $(libbacktrace_noformat_la_LIBADD)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@libbacktrace_elf_for_test_la_SOURCES = $(libbacktrace_la_SOURCES)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@libbacktrace_elf_for_test_la_LIBADD = $(BACKTRACE_FILE) elf_for_test.lo \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ $(VIEW_FILE) $(ALLOC_FILE)
+
@NATIVE_TRUE@test_elf_SOURCES = test_format.c testlib.c
@NATIVE_TRUE@test_elf_LDADD = libbacktrace_noformat.la elf.lo
@NATIVE_TRUE@test_xcoff_32_SOURCES = test_format.c testlib.c
@@ -823,6 +873,12 @@ TESTS = $(check_PROGRAMS) $(am__append_2) $(am__append_3) \
@NATIVE_TRUE@allocfail_SOURCES = allocfail.c testlib.c
@NATIVE_TRUE@allocfail_LDADD = libbacktrace_instrumented_alloc.la
+@HAVE_ELF_TRUE@@NATIVE_TRUE@b2test_SOURCES = $(btest_SOURCES)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@b2test_CFLAGS = $(btest_CFLAGS)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@b2test_LDADD = libbacktrace_elf_for_test.la
+@HAVE_ELF_TRUE@@NATIVE_TRUE@b3test_SOURCES = $(btest_SOURCES)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@b3test_CFLAGS = $(btest_CFLAGS)
+@HAVE_ELF_TRUE@@NATIVE_TRUE@b3test_LDADD = libbacktrace_elf_for_test.la
@NATIVE_TRUE@btest_SOURCES = btest.c testlib.c
@NATIVE_TRUE@btest_CFLAGS = $(AM_CFLAGS) -g -O
@NATIVE_TRUE@btest_LDADD = libbacktrace.la
@@ -835,10 +891,10 @@ TESTS = $(check_PROGRAMS) $(am__append_2) $(am__append_3) \
@NATIVE_TRUE@stest_alloc_LDADD = libbacktrace_alloc.la
@NATIVE_TRUE@ztest_SOURCES = ztest.c testlib.c
@NATIVE_TRUE@ztest_CFLAGS = -DSRCDIR=\"$(srcdir)\"
-@NATIVE_TRUE@ztest_LDADD = libbacktrace.la $(am__append_5) \
-@NATIVE_TRUE@ $(CLOCK_GETTIME_LINK)
-@NATIVE_TRUE@ztest_alloc_LDADD = libbacktrace_alloc.la $(am__append_6) \
+@NATIVE_TRUE@ztest_LDADD = libbacktrace.la $(am__append_9) \
@NATIVE_TRUE@ $(CLOCK_GETTIME_LINK)
+@NATIVE_TRUE@ztest_alloc_LDADD = libbacktrace_alloc.la \
+@NATIVE_TRUE@ $(am__append_10) $(CLOCK_GETTIME_LINK)
@NATIVE_TRUE@ztest_alloc_SOURCES = $(ztest_SOURCES)
@NATIVE_TRUE@ztest_alloc_CFLAGS = $(ztest_CFLAGS)
@NATIVE_TRUE@edtest_SOURCES = edtest.c edtest2_build.c testlib.c
@@ -971,6 +1027,9 @@ libbacktrace.la: $(libbacktrace_la_OBJECTS) $(libbacktrace_la_DEPENDENCIES) $(EX
libbacktrace_alloc.la: $(libbacktrace_alloc_la_OBJECTS) $(libbacktrace_alloc_la_DEPENDENCIES) $(EXTRA_libbacktrace_alloc_la_DEPENDENCIES)
$(AM_V_CCLD)$(LINK) $(am_libbacktrace_alloc_la_rpath) $(libbacktrace_alloc_la_OBJECTS) $(libbacktrace_alloc_la_LIBADD) $(LIBS)
+libbacktrace_elf_for_test.la: $(libbacktrace_elf_for_test_la_OBJECTS) $(libbacktrace_elf_for_test_la_DEPENDENCIES) $(EXTRA_libbacktrace_elf_for_test_la_DEPENDENCIES)
+ $(AM_V_CCLD)$(LINK) $(am_libbacktrace_elf_for_test_la_rpath) $(libbacktrace_elf_for_test_la_OBJECTS) $(libbacktrace_elf_for_test_la_LIBADD) $(LIBS)
+
libbacktrace_instrumented_alloc.la: $(libbacktrace_instrumented_alloc_la_OBJECTS) $(libbacktrace_instrumented_alloc_la_DEPENDENCIES) $(EXTRA_libbacktrace_instrumented_alloc_la_DEPENDENCIES)
$(AM_V_CCLD)$(LINK) $(am_libbacktrace_instrumented_alloc_la_rpath) $(libbacktrace_instrumented_alloc_la_OBJECTS) $(libbacktrace_instrumented_alloc_la_LIBADD) $(LIBS)
@@ -990,6 +1049,14 @@ allocfail$(EXEEXT): $(allocfail_OBJECTS) $(allocfail_DEPENDENCIES) $(EXTRA_alloc
@rm -f allocfail$(EXEEXT)
$(AM_V_CCLD)$(LINK) $(allocfail_OBJECTS) $(allocfail_LDADD) $(LIBS)
+b2test$(EXEEXT): $(b2test_OBJECTS) $(b2test_DEPENDENCIES) $(EXTRA_b2test_DEPENDENCIES)
+ @rm -f b2test$(EXEEXT)
+ $(AM_V_CCLD)$(b2test_LINK) $(b2test_OBJECTS) $(b2test_LDADD) $(LIBS)
+
+b3test$(EXEEXT): $(b3test_OBJECTS) $(b3test_DEPENDENCIES) $(EXTRA_b3test_DEPENDENCIES)
+ @rm -f b3test$(EXEEXT)
+ $(AM_V_CCLD)$(b3test_LINK) $(b3test_OBJECTS) $(b3test_LDADD) $(LIBS)
+
btest$(EXEEXT): $(btest_OBJECTS) $(btest_DEPENDENCIES) $(EXTRA_btest_DEPENDENCIES)
@rm -f btest$(EXEEXT)
$(AM_V_CCLD)$(btest_LINK) $(btest_OBJECTS) $(btest_LDADD) $(LIBS)
@@ -1089,6 +1156,30 @@ distclean-compile:
.c.lo:
$(AM_V_CC)$(LTCOMPILE) -c -o $@ $<
+b2test-btest.o: btest.c
+ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(b2test_CFLAGS) $(CFLAGS) -c -o b2test-btest.o `test -f 'btest.c' || echo '$(srcdir)/'`btest.c
+
+b2test-btest.obj: btest.c
+ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(b2test_CFLAGS) $(CFLAGS) -c -o b2test-btest.obj `if test -f 'btest.c'; then $(CYGPATH_W) 'btest.c'; else $(CYGPATH_W) '$(srcdir)/btest.c'; fi`
+
+b2test-testlib.o: testlib.c
+ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(b2test_CFLAGS) $(CFLAGS) -c -o b2test-testlib.o `test -f 'testlib.c' || echo '$(srcdir)/'`testlib.c
+
+b2test-testlib.obj: testlib.c
+ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(b2test_CFLAGS) $(CFLAGS) -c -o b2test-testlib.obj `if test -f 'testlib.c'; then $(CYGPATH_W) 'testlib.c'; else $(CYGPATH_W) '$(srcdir)/testlib.c'; fi`
+
+b3test-btest.o: btest.c
+ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(b3test_CFLAGS) $(CFLAGS) -c -o b3test-btest.o `test -f 'btest.c' || echo '$(srcdir)/'`btest.c
+
+b3test-btest.obj: btest.c
+ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(b3test_CFLAGS) $(CFLAGS) -c -o b3test-btest.obj `if test -f 'btest.c'; then $(CYGPATH_W) 'btest.c'; else $(CYGPATH_W) '$(srcdir)/btest.c'; fi`
+
+b3test-testlib.o: testlib.c
+ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(b3test_CFLAGS) $(CFLAGS) -c -o b3test-testlib.o `test -f 'testlib.c' || echo '$(srcdir)/'`testlib.c
+
+b3test-testlib.obj: testlib.c
+ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(b3test_CFLAGS) $(CFLAGS) -c -o b3test-testlib.obj `if test -f 'testlib.c'; then $(CYGPATH_W) 'testlib.c'; else $(CYGPATH_W) '$(srcdir)/testlib.c'; fi`
+
btest-btest.o: btest.c
$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(btest_CFLAGS) $(CFLAGS) -c -o btest-btest.o `test -f 'btest.c' || echo '$(srcdir)/'`btest.c
@@ -1474,6 +1565,20 @@ allocfail.log: allocfail$(EXEEXT)
--log-file $$b.log --trs-file $$b.trs \
$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
"$$tst" $(AM_TESTS_FD_REDIRECT)
+b2test.log: b2test$(EXEEXT)
+ @p='b2test$(EXEEXT)'; \
+ b='b2test'; \
+ $(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+ --log-file $$b.log --trs-file $$b.trs \
+ $(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+ "$$tst" $(AM_TESTS_FD_REDIRECT)
+b3test.log: b3test$(EXEEXT)
+ @p='b3test$(EXEEXT)'; \
+ b='b3test'; \
+ $(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+ --log-file $$b.log --trs-file $$b.trs \
+ $(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+ "$$tst" $(AM_TESTS_FD_REDIRECT)
btest.log: btest$(EXEEXT)
@p='btest$(EXEEXT)'; \
b='btest'; \
@@ -1579,6 +1684,27 @@ allocfail.sh.log: allocfail.sh
--log-file $$b.log --trs-file $$b.trs \
$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
"$$tst" $(AM_TESTS_FD_REDIRECT)
+b2test_buildid.log: b2test_buildid
+ @p='b2test_buildid'; \
+ b='b2test_buildid'; \
+ $(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)
+b3test_dwz.log: b3test_dwz
+ @p='b3test_dwz'; \
+ b='b3test_dwz'; \
+ $(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)
+b3test_dwz_buildid.log: b3test_dwz_buildid
+ @p='b3test_dwz_buildid'; \
+ b='b3test_dwz_buildid'; \
+ $(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)
btest_dwz.log: btest_dwz
@p='btest_dwz'; \
b='btest_dwz'; \
@@ -1749,6 +1875,15 @@ uninstall-am:
.PRECIOUS: Makefile
+@HAVE_ELF_TRUE@@NATIVE_TRUE@elf_for_test.c: elf.c
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ PWD=$$(pwd -P); \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ BUILD_ID_DIR="usr/lib/debug/.build-id/"; \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ SEARCH='#define SYSTEM_BUILD_ID_DIR'; \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ REPLACE="#define SYSTEM_BUILD_ID_DIR \"$$PWD/$$BUILD_ID_DIR\""; \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ $(SED) "s%^$$SEARCH.*\$$%$$REPLACE%" \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ $< \
+@HAVE_ELF_TRUE@@NATIVE_TRUE@ > $@
+
@NATIVE_TRUE@xcoff_%.c: xcoff.c
@NATIVE_TRUE@ SEARCH='#error "Unknown BACKTRACE_XCOFF_SIZE"'; \
@NATIVE_TRUE@ REPLACE='#undef BACKTRACE_XCOFF_SIZE\
@@ -1778,6 +1913,16 @@ uninstall-am:
@HAVE_OBJCOPY_DEBUGLINK_TRUE@@NATIVE_TRUE@%_gnudebuglink: %
@HAVE_OBJCOPY_DEBUGLINK_TRUE@@NATIVE_TRUE@ $(OBJCOPY) --only-keep-debug $< $@.debug
@HAVE_OBJCOPY_DEBUGLINK_TRUE@@NATIVE_TRUE@ $(OBJCOPY) --strip-debug --add-gnu-debuglink=$@.debug $< $@
+
+@NATIVE_TRUE@%_buildid: %
+@NATIVE_TRUE@ buildid=$$(readelf -n $< | grep "Build ID" | $(AWK) '{print $$3}'); \
+@NATIVE_TRUE@ prefix=$$(echo $$buildid | $(SED) 's/.//3g'); \
+@NATIVE_TRUE@ remainder=$$(echo $$buildid | $(SED) 's/^.\{2\}//'); \
+@NATIVE_TRUE@ pwd=$$(pwd -P); \
+@NATIVE_TRUE@ dir=$$pwd/usr/lib/debug/.build-id; \
+@NATIVE_TRUE@ mkdir -p $$dir/$$prefix; \
+@NATIVE_TRUE@ $(OBJCOPY) --only-keep-debug $< $$dir/$$prefix/$$remainder.debug
+@NATIVE_TRUE@ $(OBJCOPY) --strip-debug $< $@
alloc.lo: config.h backtrace.h internal.h
backtrace.lo: config.h backtrace.h internal.h
btest.lo: (INCDIR)/filenames.h backtrace.h backtrace-supported.h
diff --git a/libbacktrace/configure b/libbacktrace/configure
index 2ea112bde68..7a902ce1eaa 100755
--- a/libbacktrace/configure
+++ b/libbacktrace/configure
@@ -651,6 +651,8 @@ ALLOC_FILE
VIEW_FILE
BACKTRACE_SUPPORTS_DATA
BACKTRACE_SUPPORTED
+HAVE_ELF_FALSE
+HAVE_ELF_TRUE
FORMAT_FILE
BACKTRACE_SUPPORTS_THREADS
PIC_FLAG
@@ -11489,7 +11491,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 11492 "configure"
+#line 11494 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -11595,7 +11597,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 11598 "configure"
+#line 11600 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -12512,6 +12514,14 @@ cat >>confdefs.h <<_ACEOF
#define BACKTRACE_ELF_SIZE $elfsize
_ACEOF
+ if test "$FORMAT_FILE" = "elf.lo"; then
+ HAVE_ELF_TRUE=
+ HAVE_ELF_FALSE='#'
+else
+ HAVE_ELF_TRUE='#'
+ HAVE_ELF_FALSE=
+fi
+
# XCOFF defines.
xcoffsize=
@@ -13611,6 +13621,10 @@ if test -z "${HAVE_DWZ_TRUE}" && test -z "${HAVE_DWZ_FALSE}"; then
as_fn_error $? "conditional \"HAVE_DWZ\" was never defined.
Usually this means the macro was only invoked conditionally." "$LINENO" 5
fi
+if test -z "${HAVE_ELF_TRUE}" && test -z "${HAVE_ELF_FALSE}"; then
+ as_fn_error $? "conditional \"HAVE_ELF\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
if test -z "${HAVE_PTHREAD_TRUE}" && test -z "${HAVE_PTHREAD_FALSE}"; then
as_fn_error $? "conditional \"HAVE_PTHREAD\" was never defined.
Usually this means the macro was only invoked conditionally." "$LINENO" 5
diff --git a/libbacktrace/configure.ac b/libbacktrace/configure.ac
index c64bf3473bb..8c911e25ba3 100644
--- a/libbacktrace/configure.ac
+++ b/libbacktrace/configure.ac
@@ -259,6 +259,7 @@ elf64) elfsize=64 ;;
*) elfsize=unused
esac
AC_DEFINE_UNQUOTED([BACKTRACE_ELF_SIZE], [$elfsize], [ELF size: 32 or 64])
+AM_CONDITIONAL(HAVE_ELF, test "$FORMAT_FILE" = "elf.lo")
# XCOFF defines.
xcoffsize=
diff --git a/libbacktrace/elf.c b/libbacktrace/elf.c
index 6fee865bece..d933052200c 100644
--- a/libbacktrace/elf.c
+++ b/libbacktrace/elf.c
@@ -809,6 +809,8 @@ elf_readlink (struct backtrace_state *state, const char *filename,
}
}
+#define SYSTEM_BUILD_ID_DIR "/usr/lib/debug/.build-id/"
+
/* Open a separate debug info file, using the build ID to find it.
Returns an open file descriptor, or -1.
@@ -821,7 +823,7 @@ elf_open_debugfile_by_buildid (struct backtrace_state *state,
backtrace_error_callback error_callback,
void *data)
{
- const char * const prefix = "/usr/lib/debug/.build-id/";
+ const char * const prefix = SYSTEM_BUILD_ID_DIR;
const size_t prefix_len = strlen (prefix);
const char * const suffix = ".debug";
const size_t suffix_len = strlen (suffix);
