Add comment explaining the TARGET_OSX oddity in atomic.c.

diff --git a/mono/utils/atomic.c b/mono/utils/atomic.c
index 4d59ea356cbee39df26799e9c879951113dc7bd9..abea03e41deaad2c13255c53656cc5c8edbc365f 100755 (executable)
--- a/mono/utils/atomic.c
+++ b/mono/utils/atomic.c
@@ -425,6 +425,8 @@ void InterlockedWrite64(volatile gint64 *dst, gint64 val)
 
 #if defined (TARGET_OSX)
 
+/* The compiler breaks if this code is in the header... */
+
 gint64
 InterlockedCompareExchange64(volatile gint64 *dest, gint64 exch, gint64 comp)
 {