PR gas/12049

	* write.c (relax_frag): Don't allow forward branches to temporarily
	becomde backward branches.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index b3fb625..020f927 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,9 @@
+2010-10-25  Alan Modra  <amodra@gmail.com>
+
+       PR gas/12049
+       * write.c (relax_frag): Don't allow forward branches to temporarily
+       becomde backward branches.
+
 2010-10-23  Mark Mitchell  <mark@codesourcery.com>
 
        * config/obj-elf.c (elf_adjust_symtab): New.  Move group section

diff --git a/gas/write.c b/gas/write.c
index 080216a..4b6592f 100644 (file)
--- a/gas/write.c
+++ b/gas/write.c
@@ -2163,6 +2163,13 @@ relax_frag (segT segment, fragS *fragP, long stretch)
          if (stretch < 0
              || sym_frag->region == fragP->region)
            target += stretch;
+         /* If we get here we know we have a forward branch.  This
+            relax pass may have stretched previous instructions so
+            far that omitting STRETCH would make the branch
+            negative.  Don't allow this in case the negative reach is
+            large enough to require a larger branch instruction.  */
+         else if (target < address)
+           target = fragP->fr_next->fr_address + stretch;
        }
     }