[Bug other/67165] please enable libbacktrace to work with compressed debug sections

[ian at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67165

--- Comment #3 from ian at gcc dot gnu.org <ian at gcc dot gnu.org> ---
Author: ian
Date: Fri Sep 29 00:30:35 2017
New Revision: 253275

URL: https://gcc.gnu.org/viewcvs?rev=253275&root=gcc&view=rev
Log:
        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.
        (debug_section_names): Add names for new sections.
        (struct debug_section_info): Add compressed field.
        (elf_zlib_failed, elf_zlib_fetch): New static functions.
        (HUFFMAN_TABLE_SIZE, HUFFMAN_VALUE_MASK): Define.
        (HUFFMAN_BITS_SHIFT, HUFFMAN_BITS_MASK): Define.
        (HUFFMAN_SECONDARY_SHIFT): Define.
        (ZDEBUG_TABLE_SIZE): Define.
        (ZDEBUG_TABLE_CODELEN_OFFSET, ZDEBUG_TABLE_WORK_OFFSET): Define.
        (final_next_secondary): New static variable if
        BACKTRACE_GENERATE_FIXED_HUFFMAN_TABLE.
        (elf_zlib_inflate_table): New static function.
        (BACKTRACE_GENERATE_FIXED_HUFFMAN_TABLE): If define, define main
        function to produce fixed Huffman table.
        (elf_zlib_default_table): New static variable.
        (elf_zlib_inflate): New static function.
        (elf_zlib_verify_checksum): Likewise.
        (elf_zlib_inflate_and_verify): Likewise.
        (elf_uncompress_zdebug): Likewise.
        (elf_uncompress_chdr): Likewise.
        (backtrace_uncompress_zdebug): New extern function.
        (elf_add): Look for .zdebug sections and SHF_COMPRESSED debug
        sections, and uncompress them.
        * internal.h (backtrace_compress_zdebug): Declare.
        * ztest.c: New file.
        * configure.ac: Check for -lz and check whether the linker
        supports --compress-debug-sections.
        * Makefile.am (ztest_SOURCES): New variable.
        (ztest_CFLAGS, ztest_LDADD): New variables.
        (check_PROGRAMS): Add ztest.
        (ctestg_SOURCES): New variable.
        (ctestg_CFLAGS, ctestg_LDFLAGS, ctestg_LDADD): New variables.
        (ctesta_SOURCES): New variable.
        (ctesta_CFLAGS, ctesta_LDFLAGS, ctesta_LDADD): New variables.
        (check_PROGRAMS): Add ctestg and ctesta.
        * configure, config.h.in, Makefile.in: Rebuild.

Added:
    trunk/libbacktrace/ztest.c
Modified:
    trunk/libbacktrace/ChangeLog
    trunk/libbacktrace/Makefile.am
    trunk/libbacktrace/Makefile.in
    trunk/libbacktrace/config.h.in
    trunk/libbacktrace/configure
    trunk/libbacktrace/configure.ac
    trunk/libbacktrace/elf.c
    trunk/libbacktrace/internal.h