Add support to automatically unzip compressed executable and core files.
Files will be uncompressed into temporary directory (/tmp or $TMPDIR)
and are deleted when GDB exits.  This should be transparent to users,
except for disk space requirements.  The name of the uncompressed file is
mentioned, but all references to the file in GDB messages is to the file
which the user specified.

This operation cannot be done completely by BFD because BFD allows an opened
file to be passed to it for processing.  GDB uses this functionality.

BFD:
   * bfd-in2.h: Regenerate.
   * bfd.c (struct bfd): Add uncompressed_filename.
   * bfdio.c (bfd_get_mtime): Set bfd->mtime_set to true.
   * cache.c (bfd_open): Open previously created uncompressed file.

GDB:
   * common/filestuff.c (struct compressed_file_cache_search, eq_compressed_file,
   is_gzip, decompress_gzip, do_compressed_cleanup, gdb_uncompress): New.
   * common/filestuff.h (gdb_uncompress): Declare.
   * corelow.c (core_open): Uncompress core file.
   * exec.c (exec_file_attach): Uncompress exe file.
   * symfile.c (symfile_bfd_open): Uncompress sym (exe) file.

GDB/DOC:
   * gdb.texinfo: Mention gzipped exec and core files.

-- 
Michael Eager	 eager@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077