* Fabian Groffen <grobian@gentoo.org>
  On Gentoo, when the user doesn't have a 64-bits capable CPU, we
  compile GCC without multi-lib support.  Hence, 64-bits defines are not
  available so we better not use them if we don't have __ppc64__
  defined.

--- gdb/macosx/macosx-nat-dyld.c
+++ gdb/macosx/macosx-nat-dyld.c
@@ -619,8 +619,10 @@
          structures.  */
       if (header.cputype == CPU_TYPE_POWERPC || header.cputype == CPU_TYPE_I386)
         osabi_seen_in_attached_dyld = GDB_OSABI_DARWIN;
+#if defined(__ppc64__)
       if (header.cputype == CPU_TYPE_POWERPC64 || header.cputype == GDB_CPU_TYPE_X86_64)
         osabi_seen_in_attached_dyld = GDB_OSABI_DARWIN64;
+#endif
     }
 
   /* Once we know the address at which dyld was loaded, we can try to