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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.
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2008-04-19 Craig Silverstein <csilvers@google.com>
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* NEWS: Add information on compressed debug sections.
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2008-04-19 Vladimir Prus <vladimir@codesourcery.com>
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* mi/mi-cmd-var.c (varobj_update_one): Print new
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5
gdb/NEWS
5
gdb/NEWS
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*** Changes since GDB 6.8
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* GDB can now read compressed debug sections, as produced by GNU gold
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with the --compress-debug-sections=zlib flag.
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* Watchpoints can now be set on unreadable memory locations, e.g. addresses
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which will be allocated using malloc later in program execution.
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* The qXfer:libraries:read remote procotol packet now allows passing a
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list of section offsets.
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list of section offsets.
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* New features in the GDB remote stub, gdbserver
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@ -1,3 +1,10 @@
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2008-04-19 Craig Silverstein <csilvers@google.com>
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* gdb.texinfo (Requirements): Add an optional requirement on
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zlib.
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* gdbint.texinfo (Debugging File Formats): Add new subsection for
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Compressed DWARF 2.
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2008-04-16 Aleksandar Ristovski <aristovski@qnx.com>
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* gdb.texinfo (GDB/MI Simple Examples): Added 'disp' field to the
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@ -22732,6 +22732,18 @@ Remote shared library lists (@pxref{Library List Format})
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MS-Windows shared libraries (@pxref{Shared Libraries})
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@end itemize
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@item zlib
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@cindex compressed debug sections
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@value{GDBN} will use the @samp{zlib} library, if available, to read
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compressed debug sections. Some linkers, such as GNU gold, are capable
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of producing binaries with compressed debug sections. If @value{GDBN}
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is compiled with @samp{zlib}, it will be able to read the debug
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information in such binaries.
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The @samp{zlib} library is likely included with your operating system
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distribution; if it is not, you can get the latest version from
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@url{http://zlib.net}.
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@end table
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@node Running Configure
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The DWARF 2 reader is in @file{dwarf2read.c}.
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@subsection Compressed DWARF 2
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@cindex Compressed DWARF 2 debugging info
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Compressed DWARF 2 is not technically a separate debugging format, but
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merely DWARF 2 debug information that has been compressed. In this
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format, every object-file section holding DWARF 2 debugging
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information is compressed and prepended with a header. (The section
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is also typically renamed, so a section called @code{.debug_info} in a
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DWARF 2 binary would be called @code{.zdebug_info} in a compressed
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DWARF 2 binary.) The header is 12 bytes long:
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@itemize @bullet
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@item
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4 bytes: the literal string ``ZLIB''
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@item
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8 bytes: the uncompressed size of the section, in big-endian byte
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order.
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@end itemize
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The same reader is used for both compressed an normal DWARF 2 info.
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Section decompression is done in @code{zlib_decompress_section} in
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@file{dwarf2read.c}.
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@subsection SOM
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@cindex SOM debugging info
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