Default to --enable-compressed-debug-sections=gas for Linux/x86

--enable-compressed-debug-sections=gas added to binutils 2.26.  Make it
default for Linux/x86 targets in 2.27.

	* NEWS: Mention --enable-compressed-debug-sections=gas is the
	default for Linux/x86 targets.
	* configure.tgt (ac_default_compressed_debug_sections): Default
	to yes for Linux/x86 targets.

gas/ChangeLog

+2016-06-29  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* NEWS: Mention --enable-compressed-debug-sections=gas is the
+	default for Linux/x86 targets.
+	* configure.tgt (ac_default_compressed_debug_sections): Default
+	to yes for Linux/x86 targets.
+
 2016-06-29  Maciej W. Rozycki  <macro@imgtec.com>
 
 	* write.c: Remove "libbfd.h" inclusion.

gas/NEWS

 -*- text -*-
+* Default to --enable-compressed-debug-sections=gas for Linux/x86 targets.
+
 * Add --no-pad-sections to stop the assembler from padding the end of output
   sections up to their alignment boundary.
 

gas/configure.tgt

@@ -502,3 +502,12 @@ if test $bfd_gas != yes; then
   echo This target is no longer supported in gas
   exit 1
 fi
+
+case ${cpu_type}-${fmt}-${os} in
+i386-elf-linux*)
+  # Default to compress DWARF debug sections for Linux/x86.
+  if test ${ac_default_compressed_debug_sections} = unset; then
+    ac_default_compressed_debug_sections=yes
+  fi
+  ;;
+esac