Remove const from _Atomic vars to make Clang happy

Clang does not allow using C11's atomic_load on const _Atomic variables.
Previously it just disabled use of C11 atomics if atomic_load didn't work on a
const _Atomic variable, but I think I'd prefer to have Clang use C11 atomics
for the added features (more explicit memory ordering) even if it means a few
instances of breaking const.

1 files changed, 14 insertions, 0 deletions

diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index b604c547..174210fa 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -204,6 +204,20 @@ AL_API const ALchar* AL_APIENTRY alGetStringiSOFT(ALenum pname, ALsizei index);
 #endif
 
 
+#ifdef __GNUC__
+/* This helps cast away the const-ness of a pointer without accidentally
+ * changing the pointer type. This is necessary due to Clang's inability to use
+ * atomic_load on a const _Atomic variable.
+ */
+#define CONST_CAST(T, V) __extension__({                                      \
+    const T _tmp = (V);                                                       \
+    (T)_tmp;                                                                  \
+})
+#else
+#define CONST_CAST(T, V) ((T)(V))
+#endif
+
+
 typedef ALint64SOFT ALint64;
 typedef ALuint64SOFT ALuint64;