* gas/NEWS: Add note about --compress-debug-sections.

* gas/as.c (show_usage): Add --compress-debug-sections and
	--nocompress-debug-sections.

gas/NEWS

@@ -9,6 +9,11 @@
 
 * Add support for the Renesas RX processor.
 
+* New command line option, --compress-debug-sections, which requests
+  compression of DWARF debug information sections in the relocatable output
+  file.  Compressed debug sections are supported by readelf, objdump, and
+  gold, but not currently by Gnu ld.
+
 Changes in 2.20:
 
 * GNU/Linux targets now supports "gnu_unique_object" as a value in the .type

gas/as.c

@@ -246,9 +246,16 @@ Options:\n\
   fprintf (stream, _("\
   --alternate             initially turn on alternate macro syntax\n"));
   fprintf (stream, _("\
+  --compress-debug-sections\n\
+                          compress DWARF debug sections using zlib\n"));
+  fprintf (stream, _("\
+  --nocompress-debug-sections\n\
+                          don't compress DWARF debug sections\n"));
+  fprintf (stream, _("\
   -D                      produce assembler debugging messages\n"));
   fprintf (stream, _("\
-  --debug-prefix-map OLD=NEW  Map OLD to NEW in debug information\n"));
+  --debug-prefix-map OLD=NEW\n\
+                          map OLD to NEW in debug information\n"));
   fprintf (stream, _("\
   --defsym SYM=VAL        define symbol SYM to given value\n"));
 #ifdef USE_EMULATIONS