Fix for GNUstep build failure during dumping.

* unexelf.c (unexec) [NS_IMPL_GNUSTEP]: Take account of the case
that where the value of an _OBJC_* symbol points to is in the .bss
section (Bug#10240).

src/ChangeLog

+2011-12-09  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
+
+	* unexelf.c (unexec) [NS_IMPL_GNUSTEP]: Take account of the case
+	that where the value of an _OBJC_* symbol points to is in the .bss
+	section (Bug#10240).
+
 2011-12-08  Kazuhiro Ito  <kzhr@d1.dion.ne.jp>  (tiny change)
 
 	* coding.c (encode_coding_ccl): Check (charbuf < charbuf_end)

src/unexelf.c

@@ -1219,9 +1219,15 @@ unexec (const char *new_name, const char *old_name)
 	      nn = symp->st_shndx;
 	      if (nn > old_bss_index)
 		nn--;
-	      old = ((symp->st_value - NEW_SECTION_H (symp->st_shndx).sh_addr)
-		     + OLD_SECTION_H (nn).sh_offset + old_base);
-	      memcpy (new, old, symp->st_size);
+	      if (nn == old_bss_index)
+		memset (new, 0, symp->st_size);
+	      else
+		{
+		  old = ((symp->st_value
+			  - NEW_SECTION_H (symp->st_shndx).sh_addr)
+			 + OLD_SECTION_H (nn).sh_offset + old_base);
+		  memcpy (new, old, symp->st_size);
+		}
 	    }
 #endif
 	}