From 8a111b33ffcbd13d7c6ed40021e4e37fb1df08a7 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@acm.org>
Date: Thu, 26 Jun 2008 08:58:25 +0000
Subject: [PATCH] Let the compiler print a comprehensible error message if it
 does not provide built-in functions for atomic memory access.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8284
---
 helgrind/tests/tc11_XCHG.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/helgrind/tests/tc11_XCHG.c b/helgrind/tests/tc11_XCHG.c
index 1d9df4c281..28ef78383b 100644
--- a/helgrind/tests/tc11_XCHG.c
+++ b/helgrind/tests/tc11_XCHG.c
@@ -1,4 +1,5 @@
 
+#include "config.h"
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -47,6 +48,7 @@
      )
 #elif defined(PLAT_ppc32_linux) || defined(PLAT_ppc64_linux) \
       || defined(PLAT_ppc32_aix5) || defined(PLAT_ppc64_aix5)
+#ifdef HAVE_BUILTIN_ATOMIC
 #  define XCHG_M_R(_addr,_lval)                                           \
       do {                                                                \
         int tmp;                                                          \
@@ -55,6 +57,9 @@
           ;                                                               \
         _lval = tmp;                                                      \
       } while (0)
+#else
+#error "XCHG_M_R() implementation is missing. Either provide one or use a newer gcc version."
+#endif
 #  define XCHG_M_R_with_redundant_LOCK(_addr,_lval) \
       XCHG_M_R(_addr,_lval)
 #else
-- 
2.47.2