source: scripts/patch/binutils/2.19.1/20-relaxed_ld_powerpc.patch@ bb15c25

This aims to make life a little easier for people building large
PowerPC binaries where the PLT is out of reach for 24-bit branches.

        * emultempl/ppc32elf.em (ppc_before_allocation): Turn on
        linker relaxation if it might be necessary.

diff -Naur binutils-2.19.1.orig/ld/emultempl/ppc32elf.em binutils-2.19.1/ld/emultempl/ppc32elf.em
--- binutils-2.19.1.orig/ld/emultempl/ppc32elf.em       2008-02-15 01:03:02.000000000 -0800
+++ binutils-2.19.1/ld/emultempl/ppc32elf.em    2009-07-19 20:22:20.000000000 -0700
@@ -112,7 +112,40 @@
            }
        }
     }
+
   gld${EMULATION_NAME}_before_allocation ();
+
+  /* Turn on relaxation if executable sections have addresses that
+     might make branches overflow.  */
+  if (!command_line.relax)
+    {
+      bfd_vma low = (bfd_vma) -1;
+      bfd_vma high = 0;
+      asection *o;
+
+      /* Run lang_size_sections (if not already done).  */
+      if (expld.phase != lang_mark_phase_enum)
+       {
+         expld.phase = lang_mark_phase_enum;
+         expld.dataseg.phase = exp_dataseg_none;
+         one_lang_size_sections_pass (NULL, FALSE);
+         lang_reset_memory_regions ();
+       }
+
+      for (o = link_info.output_bfd->sections; o != NULL; o = o->next)
+       {
+         if ((o->flags & (SEC_ALLOC | SEC_CODE)) != (SEC_ALLOC | SEC_CODE))
+           continue;
+         if (o->size == 0)
+           continue;
+         if (low > o->vma)
+           low = o->vma;
+         if (high < o->vma + o->size - 1)
+           high = o->vma + o->size - 1;
+       }
+      if (high > low && high - low > (1 << 25) - 1)
+       command_line.relax = TRUE;
+    }
 }
 
 EOF