Make default compression gABI compliant

All programs in binutils+gdb git repo now support gABI compression
with the SHF_COMPRESSED bit.  This patch makes the zlib-gabi option
as compression default for gas, gold, ld and objcopy, instead of the
zlib-gnu option whose outputs are incompatible with gABI.

binutils/

	* objcopy.c (copy_file): Set BFD_COMPRESS_GABI if not
	zlib-gnu.
	* doc/binutils.texi: Change --compress-debug-sections and
	--compress-debug-sections=zlib to zlib-gabi.

binutils/testsuite/

	* binutils-all/compress.exp: Update.

gas/

	* as.c (parse_args): Make --compress-debug-sections and
	--compress-debug-sections=zlib the same as
	--compress-debug-sections=zlib-gabi.
	* doc/as.texinfo: Change --compress-debug-sections and
	--compress-debug-sections=zlib to zlib-gabi.

gold/

	* compressed_output.cc (Output_compressed_section::set_final_data_size):
	Make --compress-debug-sections=zlib the same as
	--compress-debug-sections=zlib-gabi.
	* testsuite/Makefile.am (flagstest_compress_debug_sections.check):
	Expect ".debug_.*" with the SHF_COMPRESSED bit, instead of
	".zdebug_".
	* testsuite/Makefile.in: Regenerated.

ld/

	* emultempl/elf32.em (gld${EMULATION_NAME}_handle_option): Make
	--compress-debug-sections=zlib the same as
	--compress-debug-sections=zlib-gabi.
	* ld.texinfo: Change --compress-debug-sections=zlib to zlib-gabi.

ld/testsuite/

	* ld-elf/zlibbegin.rS: Updated to .debug_.* with the
	SHF_COMPRESSED bit.
	* ld-elf/zlibnormal.rS: Likewise.

3 files changed, 20 insertions, 9 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 5374c5e..8d84bab 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,11 @@
+2015-07-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* as.c (parse_args): Make --compress-debug-sections and
+	--compress-debug-sections=zlib the same as
+	--compress-debug-sections=zlib-gabi.
+	* doc/as.texinfo: Change --compress-debug-sections and
+	--compress-debug-sections=zlib to zlib-gabi.
+
 2015-07-09  Catherine Moore  <clm@codesourcery.com>
 
         * config/tc-mips.c (check_fpabi):  Handle
diff --git a/gas/as.c b/gas/as.c
index b8a5be4..6fb28e9 100644
--- a/gas/as.c
+++ b/gas/as.c
@@ -665,7 +665,7 @@ This program has absolutely no warranty.\n"));
 	      if (strcasecmp (optarg, "none") == 0)
 		flag_compress_debug = COMPRESS_DEBUG_NONE;
 	      else if (strcasecmp (optarg, "zlib") == 0)
-		flag_compress_debug = COMPRESS_DEBUG_GNU_ZLIB;
+		flag_compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
 	      else if (strcasecmp (optarg, "zlib-gnu") == 0)
 		flag_compress_debug = COMPRESS_DEBUG_GNU_ZLIB;
 	      else if (strcasecmp (optarg, "zlib-gabi") == 0)
@@ -679,7 +679,7 @@ This program has absolutely no warranty.\n"));
 #endif
 	    }
 	  else
-	    flag_compress_debug = COMPRESS_DEBUG;
+	    flag_compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
 	  break;
 
 	case OPTION_NOCOMPRESS_DEBUG:
diff --git a/gas/doc/as.texinfo b/gas/doc/as.texinfo
index 950bf28..70f1b96 100644
--- a/gas/doc/as.texinfo
+++ b/gas/doc/as.texinfo
@@ -625,10 +625,10 @@ Begin in alternate macro mode.
 @end ifclear
 
 @item --compress-debug-sections
-Compress DWARF debug sections using zlib.  The debug sections are renamed
-to begin with @samp{.zdebug}, and the resulting object file may not be
-compatible with older linkers and object file utilities.  Note if compression
-would make a given section @emph{larger} then it is not compressed or renamed.
+Compress DWARF debug sections using zlib with SHF_COMPRESSED from the
+ELF ABI.  The resulting object file may not be compatible with older
+linkers and object file utilities.  Note if compression would make a
+given section @emph{larger} then it is not compressed.
 
 @ifset ELF
 @cindex @samp{--compress-debug-sections=} option
@@ -640,10 +640,13 @@ These options control how DWARF debug sections are compressed.
 @option{--compress-debug-sections=none} is equivalent to
 @option{--nocompress-debug-sections}.
 @option{--compress-debug-sections=zlib} and
-@option{--compress-debug-sections=zlib-gnu} are equivalent to
+@option{--compress-debug-sections=zlib-gabi} are equivalent to
 @option{--compress-debug-sections}.
-@option{--compress-debug-sections=zlib-gabi} compresses
-DWARF debug sections with SHF_COMPRESSED from the ELF ABI.
+@option{--compress-debug-sections=zlib-gnu} compresses DWARF debug
+sections using zlib.  The debug sections are renamed to begin with
+@samp{.zdebug}.  Note if compression would make a given section
+@emph{larger} then it is not compressed nor renamed.
+
 @end ifset
 
 @item --nocompress-debug-sections