[FFmpeg-cvslog] atomic: fix CAS with armcc.

[Anton Khirnov]

ffmpeg | branch: master | Anton Khirnov <anton at khirnov.net> | Fri Mar  8 20:57:31 2013 +0100| [6327c10702922eabcb1c6170abd3f03d23ce4c51] | committer: Anton Khirnov

atomic: fix CAS with armcc.

On the current code, armcc will fail with:
"libavutil/atomic_gcc.h", line 52: Error:  #2771: first argument must be
a pointer to integer or enumeration type

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6327c10702922eabcb1c6170abd3f03d23ce4c51
---

 libavutil/atomic_gcc.h |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libavutil/atomic_gcc.h b/libavutil/atomic_gcc.h
index 13713c8..9470e8e 100644
--- a/libavutil/atomic_gcc.h
+++ b/libavutil/atomic_gcc.h
@@ -21,6 +21,8 @@
 #ifndef AVUTIL_ATOMIC_GCC_H
 #define AVUTIL_ATOMIC_GCC_H
 
+#include <stdint.h>
+
 #include "atomic.h"
 
 #define avpriv_atomic_int_get atomic_int_get_gcc
@@ -47,7 +49,13 @@ static inline int atomic_int_add_and_fetch_gcc(volatile int *ptr, int inc)
 static inline void *atomic_ptr_cas_gcc(void * volatile *ptr,
                                        void *oldval, void *newval)
 {
+#ifdef __ARMCC_VERSION
+    // armcc will throw an error if ptr is not an integer type
+    volatile uintptr_t *tmp = (volatile uintptr_t*)ptr;
+    return (void*)__sync_val_compare_and_swap(tmp, oldval, newval);
+#else
     return __sync_val_compare_and_swap(ptr, oldval, newval);
+#endif
 }
 
 #endif /* AVUTIL_ATOMIC_GCC_H */