FreeBSD only works on Sparc64 and freeBSD code relies on the __sparc64__ define.
gcc only defines __sparc64__ if -mcpu is not used.
gcc-4 defaults to using -mcpu=ultrasparc on FreeBSD.

This causes us a problem. Infact, FreeBSD developers sent gcc a patch to always
define __sparc64__ when using -mcpu=ultrasparc, but this was rejected by most
people including NetBSD developers.

The correct solution is to use __sparc__.
If platform detection is required, or the code is obviously 64 bit then we can
use the __arch64__ define as well.
This combination should be supported by all gcc versions:)

diff -ur libexec.orig/rtld-elf/rtld.c libexec/rtld-elf/rtld.c
--- libexec.orig/rtld-elf/rtld.c	2006-10-10 08:16:56 +0100
+++ libexec/rtld-elf/rtld.c	2006-10-10 08:19:08 +0100
@@ -2732,7 +2732,7 @@
 
 #endif
 
-#if defined(__i386__) || defined(__amd64__) || defined(__sparc64__) || \
+#if defined(__i386__) || defined(__amd64__) || defined(__sparc__) || \
     defined(__arm__)
 
 /*
@@ -2897,7 +2897,7 @@
 void
 free_tls_offset(Obj_Entry *obj)
 {
-#if defined(__i386__) || defined(__amd64__) || defined(__sparc64__) || \
+#if defined(__i386__) || defined(__amd64__) || defined(__sparc__) || \
     defined(__arm__)
     /*
      * If we were the last thing to allocate out of the static TLS