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List:       kde-bugs-dist
Subject:    [valgrind] [Bug 303877] valgrind doesn't support compressed debuginfo sections.
From:       Aleksandar Rikalo via KDE Bugzilla <bugzilla_noreply () kde ! org>
Date:       2016-04-08 10:49:22
Message-ID: bug-303877-17878-xlWoe0Ss5l () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=303877

--- Comment #30 from Aleksandar Rikalo <aleksandar.rikalo@imgtec.com> ---
Thank you for suggestions.

I've prepared few patches:

ElfXX_Chdr-build-fixup.diff - tinfl is moved to m_debuginfo, checking for
Elf32/64_Chdr structs is placed into "configure" and line endings in tinfl.c
are converted to Unix style.

Elf32/64_Chdr, SHF_COMPRESSED and ELFCOMPRESS_ZLIB come from libc (<elf.h>) and
exist only in newer versions of libc. These structures/constants are not
present in Kernel, so I didn't move them to vki. We can place them to separate
header or pub_tool_libcbase.h, if you think it's more appropriate.

zdebug-support.diff - support for .zdebug sections is added to readelf.c.

Three kinds of compressed debug sections are supported by Binutils 2.26 (zlib,
zlib-gnu and zlib-gabi) and I have tested Valgrind with all of them on MIPS/X86
Linux.

According to the manual
(https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html), GCC should support
-gz=zlib and -gz=zlib-gnu options for generating compressed debug sections, but
I haven't succeeded to set up the environment in which it works. I've written
two simple Memchek tests (compressed_sections_test.diff) which use these
options, but they are not tested properly.

The order of applying patches (after applying compressed-dwarf-support.diff and
tinfl-modifications.diff) :

patch -p1 < ElfXX_Chdr-build-fixup.diff
patch -p1 < zdebug-support.diff
patch -p1 < compressed_sections_test.diff

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