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.

5 files changed, 35 insertions, 17 deletions

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index c504b33..4431ab8 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,10 @@
+2015-07-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* 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.
+
 2015-07-10  H.J. Lu  <hongjiu.lu@intel.com>
 
 	 PR binutils/18656
diff --git a/binutils/doc/binutils.texi b/binutils/doc/binutils.texi
index 0781036..466f125 100644
--- a/binutils/doc/binutils.texi
+++ b/binutils/doc/binutils.texi
@@ -1844,10 +1844,9 @@ It can also be a useful way of reducing the size of a @option{--just-symbols}
 linker input file.
 
 @item --compress-debug-sections
-Compress DWARF debug sections using zlib.  The debug sections are
-renamed to begin with @samp{.zdebug} instead of @samp{.debug}.  Note -
-if compression would actually make a section @emph{larger} then it is
-not compressed or renamed.
+Compress DWARF debug sections using zlib with SHF_COMPRESSED from the
+ELF ABI.  Note - if compression would actually make a section
+@emph{larger}, then it is not compressed.
 
 @item --compress-debug-sections=none
 @itemx --compress-debug-sections=zlib
@@ -1857,10 +1856,13 @@ For ELF files, 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} instead of @samp{.debug}.  Note - if compression would
+actually make a section @emph{larger}, then it is not compressed nor
+renamed.
 
 @item --decompress-debug-sections
 Decompress DWARF debug sections using zlib.  The original section
diff --git a/binutils/objcopy.c b/binutils/objcopy.c
index d6516e0..bb6ca44 100644
--- a/binutils/objcopy.c
+++ b/binutils/objcopy.c
@@ -2607,7 +2607,7 @@ copy_file (const char *input_filename, const char *output_filename,
       ibfd->flags |= BFD_COMPRESS;
       /* Don't check if input is ELF here since this information is
 	 only available after bfd_check_format_matches is called.  */
-      if (do_debug_sections == compress_gabi_zlib)
+      if (do_debug_sections != compress_gnu_zlib)
 	ibfd->flags |= BFD_COMPRESS_GABI;
       break;
     case decompress:
diff --git a/binutils/testsuite/ChangeLog b/binutils/testsuite/ChangeLog
index 435961a..5f4fbc3 100644
--- a/binutils/testsuite/ChangeLog
+++ b/binutils/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2015-07-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* binutils-all/compress.exp: Update.
+
 2015-07-10  H.J. Lu  <hongjiu.lu@intel.com>
 
 	 PR binutils/18656
diff --git a/binutils/testsuite/binutils-all/compress.exp b/binutils/testsuite/binutils-all/compress.exp
index abff197..4dac503 100644
--- a/binutils/testsuite/binutils-all/compress.exp
+++ b/binutils/testsuite/binutils-all/compress.exp
@@ -39,7 +39,12 @@ if { ![binutils_assemble_flags $srcdir/$subdir/dw2-1.S ${compressedfile}.o --com
     return
 }
 
-set got [remote_exec host "cmp ${testfile}.o ${compressedfile}.o"]
+if { ![binutils_assemble_flags $srcdir/$subdir/dw2-1.S ${compressedfile}gnu.o --compress-debug-sections=zlib-gnu] } then {
+    unsupported "compressed debug sections with zlib-gnu"
+    return
+}
+
+set got [remote_exec host "cmp ${testfile}.o ${compressedfile}gnu.o"]
 # Use it to set up xfail.
 set exec_output [lindex $got 1]
 if [string match "" $exec_output] then {
@@ -136,8 +141,8 @@ if ![string match "" $got] then {
 
 # Xfail this test if there are no compressed sections.
 setup_xfail "$compression_used$target_triplet"
-set testname "objcopy compress debug sections in archive"
-set got [binutils_run $OBJCOPY "--compress-debug-sections ${copyfile}.a ${compressedcopyfile}.a"]
+set testname "objcopy compress debug sections in archive with zlib-gnu"
+set got [binutils_run $OBJCOPY "--compress-debug-sections=zlib-gnu ${copyfile}.a ${compressedcopyfile}.a"]
 if ![string match "" $got] then {
     fail "objcopy ($testname)"
 } else {
@@ -228,13 +233,13 @@ if { ![binutils_assemble_flags $srcdir/$subdir/dw2-1.S ${compressedfile}gnu.o --
     return
 }
 
-set src1 ${compressedfile}gnu.o
+set src1 ${compressedfile}gabi.o
 set src2 ${compressedfile}.o
 set status [remote_exec build cmp "${src1} ${src2}"]
 set exec_output [lindex $status 1]
 set exec_output [prune_warnings $exec_output]
 if ![string match "" $exec_output] then {
-    fail "compressed debug sections with zlib-gnu"
+    fail "compressed debug sections with zlib-gabi"
     return
 }
 
@@ -248,13 +253,13 @@ if { ![binutils_assemble_flags $srcdir/$subdir/dw2-2.S ${compressedfile2}gnu.o -
     return
 }
 
-set src1 ${compressedfile2}gnu.o
+set src1 ${compressedfile2}gabi.o
 set src2 ${compressedfile2}.o
 set status [remote_exec build cmp "${src1} ${src2}"]
 set exec_output [lindex $status 1]
 set exec_output [prune_warnings $exec_output]
 if ![string match "" $exec_output] then {
-    fail "compressed debug sections with zlib-gnu"
+    fail "compressed debug sections with zlib-gabi"
     return
 }
 
@@ -292,13 +297,13 @@ if { ![binutils_assemble_flags $srcdir/$subdir/dw2-3.S ${compressedfile3}gnu.o -
     return
 }
 
-set src1 ${compressedfile3}gnu.o
+set src1 ${compressedfile3}gabi.o
 set src2 ${compressedfile3}.o
 set status [remote_exec build cmp "${src1} ${src2}"]
 set exec_output [lindex $status 1]
 set exec_output [prune_warnings $exec_output]
 if ![string match "" $exec_output] then {
-    fail "compressed debug sections with zlib-gnu"
+    fail "compressed debug sections with zlib-gabi"
     return
 }