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* NEWS: Add information on compressed debug sections. 

* doc/gdb.texinfo (Requirements): Add an optional requirement
      on zlib.
      * doc/gdbint.texinfo (Debugging File Formats): Add new
      subsection for Compressed DWARF 2.
This commit is contained in:
Craig Silverstein 2008-04-20 00:03:25 +00:00
parent 1386d68a62
commit 31fffb0212
5 changed files with 51 additions and 2 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,7 @@
2008-04-19 Craig Silverstein <csilvers@google.com>
* NEWS: Add information on compressed debug sections.
2008-04-19 Vladimir Prus <vladimir@codesourcery.com>
* mi/mi-cmd-var.c (varobj_update_one): Print new
@ -27,7 +31,7 @@
* Makefile.in (linespec.o, mi-interp.o): Add dependencies.
2008-04-18 Craig Silverstein <csilvers@google.com>
2008-04-18 Craig Silverstein <csilvers@google.com>
* configure.ac (AC_SEARCH_LIBS): Add check for zlib.
* config.in, configure: Regenerate.

5
gdb/NEWS
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@ -3,11 +3,14 @@
*** Changes since GDB 6.8
* GDB can now read compressed debug sections, as produced by GNU gold
with the --compress-debug-sections=zlib flag.
* Watchpoints can now be set on unreadable memory locations, e.g. addresses
which will be allocated using malloc later in program execution.
* The qXfer:libraries:read remote procotol packet now allows passing a
list of section offsets.
list of section offsets.
* New features in the GDB remote stub, gdbserver

7
gdb/doc/ChangeLog
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@ -1,3 +1,10 @@
2008-04-19 Craig Silverstein <csilvers@google.com>
* gdb.texinfo (Requirements): Add an optional requirement on
zlib.
* gdbint.texinfo (Debugging File Formats): Add new subsection for
Compressed DWARF 2.
2008-04-16 Aleksandar Ristovski <aristovski@qnx.com>
* gdb.texinfo (GDB/MI Simple Examples): Added 'disp' field to the

12
gdb/doc/gdb.texinfo
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@ -22732,6 +22732,18 @@ Remote shared library lists (@pxref{Library List Format})
MS-Windows shared libraries (@pxref{Shared Libraries})
@end itemize
@item zlib
@cindex compressed debug sections
@value{GDBN} will use the @samp{zlib} library, if available, to read
compressed debug sections. Some linkers, such as GNU gold, are capable
of producing binaries with compressed debug sections. If @value{GDBN}
is compiled with @samp{zlib}, it will be able to read the debug
information in such binaries.
The @samp{zlib} library is likely included with your operating system
distribution; if it is not, you can get the latest version from
@url{http://zlib.net}.
@end table
@node Running Configure

23
gdb/doc/gdbint.texinfo
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@ -2201,6 +2201,29 @@ DWARF 2 is an improved but incompatible version of DWARF 1.
The DWARF 2 reader is in @file{dwarf2read.c}.
@subsection Compressed DWARF 2
@cindex Compressed DWARF 2 debugging info
Compressed DWARF 2 is not technically a separate debugging format, but
merely DWARF 2 debug information that has been compressed. In this
format, every object-file section holding DWARF 2 debugging
information is compressed and prepended with a header. (The section
is also typically renamed, so a section called @code{.debug_info} in a
DWARF 2 binary would be called @code{.zdebug_info} in a compressed
DWARF 2 binary.) The header is 12 bytes long:
@itemize @bullet
@item
4 bytes: the literal string ``ZLIB''
@item
8 bytes: the uncompressed size of the section, in big-endian byte
order.
@end itemize
The same reader is used for both compressed an normal DWARF 2 info.
Section decompression is done in @code{zlib_decompress_section} in
@file{dwarf2read.c}.
@subsection SOM
@cindex SOM debugging info