[PATCH] New option --print-gc-sections

[Alan Modra]

On Tue, Mar 28, 2006 at 11:31:41AM +0200, Eric Botcazou wrote:
> We'd like to introduce a --print-gc-sections option

Actually, you can already glean this from a link map.  GC'd sections
will be those that are shown with zero size.  Perhaps you could instead
enhance ldlang.c:print_input_section a little to flag them as being
discarded, like the following (totally untested) patch.

Index: ld/ldlang.c
===================================================================
RCS file: /cvs/src/src/ld/ldlang.c,v
retrieving revision 1.213
diff -u -p -r1.213 ldlang.c
--- ld/ldlang.c	16 Mar 2006 12:20:16 -0000	1.213
+++ ld/ldlang.c	29 Mar 2006 12:47:51 -0000
@@ -3511,7 +3511,7 @@ print_input_section (lang_input_section_
 
       minfo ("0x%V %W %B\n", addr, TO_ADDR (size), i->owner);
 
-      if (size != i->rawsize && i->rawsize != 0)
+      if (size == 0 || (size != i->rawsize && i->rawsize != 0))
 	{
 	  len = SECTION_NAME_MAP_LENGTH + 3;
 #ifdef BFD64
@@ -3525,7 +3525,10 @@ print_input_section (lang_input_section_
 	      --len;
 	    }
 
-	  minfo (_("%W (size before relaxing)\n"), i->rawsize);
+	  if (size == 0)
+	    minfo (_("(discarded)\n"));
+	  else
+	    minfo (_("%W (size before relaxing)\n"), i->rawsize);
 	}
 
       if (i->output_section != NULL && (i->flags & SEC_EXCLUDE) == 0)

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre