libbacktrace patch committed: Support compressed debug sections

[Gerald Pfeifer]

On Thu, 28 Sep 2017, Ian Lance Taylor wrote:
> This patch to libbacktrace adds support for compressed debug sections.
> 2017-09-28  Ian Lance Taylor  <iant@golang.org>
> 
> PR other/67165
> * elf.c (__builtin_prefetch): Define if not __GNUC__.
> (unlikely): Define.
> (SHF_UNCOMPRESSED, ELFCOMPRESS_ZLIB): Define.
> (b_elf_chdr): Define type.
> (enum debug_section): Add ZDEBUG_xxx values.

Since this change I am seeing the following in my night GCC build
and test logs on FreeBSD systems:

gmake[2]: autogen: Command not found
gmake[2]: *** [Makefile:176: check] Error 127
gmake[1]: *** [Makefile:3759: check-fixincludes] Error 2
/scratch/tmp/gerald/GCC-HEAD/libbacktrace/ztest.c: In function 'test_large':
/scratch/tmp/gerald/GCC-HEAD/libbacktrace/ztest.c:384:41: warning: passing argument 2 of 'uncompress' from incompatible pointer type [-Wincompatible-pointer-types]
       r = uncompress (uncompressed_buf, &uncompressed_bufsize,
                                         ^~~~~~~~~~~~~~~~~~~~~
In file included from /scratch/tmp/gerald/GCC-HEAD/libbacktrace/ztest.c:43:0:
/usr/include/zlib.h:1265:21: note: expected 'uLongf * {aka long unsigned int *}' but argument is of type 'size_t * {aka unsigned int *}'
 ZEXTERN int ZEXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
                     ^~~~~~~~~~
/scratch/tmp/gerald/GCC-HEAD/libbacktrace/ztest.c: In function 'test_large':
/scratch/tmp/gerald/GCC-HEAD/libbacktrace/ztest.c:384:41: warning: passing argument 2 of 'uncompress' from incompatible pointer type [-Wincompatible-pointer-types]
       r = uncompress (uncompressed_buf, &uncompressed_bufsize,
                                         ^~~~~~~~~~~~~~~~~~~~~
In file included from /scratch/tmp/gerald/GCC-HEAD/libbacktrace/ztest.c:43:0:
/usr/include/zlib.h:1265:21: note: expected 'uLongf * {aka long unsigned int *}' but argument is of type 'size_t * {aka unsigned int *}'
 ZEXTERN int ZEXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
                     ^~~~~~~~~~
gmake[4]: *** [Makefile:306: check-DEJAGNU] Error 1
gmake[3]: *** [Makefile:350: check-am] Error 2
gmake[2]: *** [Makefile:904: check-recursive] Error 1
gmake[1]: *** [Makefile:22343: check-target-libgomp] Error 2
Fatal error 'mutex is on list' at line 272 in file /usr/src/lib/libthr/thread/thr_mutex.c (errno = 0)
Fatal error 'mutex is on list' at line 272 in file /usr/src/lib/libthr/thread/thr_mutex.c (errno = 0)
gmake: *** [Makefile:2286: do-check] Error 2

Gerald