[PATCH v2 3/5] nedmalloc: allow compiling with MSys2's compiler

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With MSys2's GCC, `ReadWriteBarrier` is already defined, and FORCEINLINE
unfortunately gets defined incorrectly.

Let's work around both problems, using the MSys2-specific
__MINGW64_VERSION_MAJOR constant to guard the FORCEINLINE definition so
as not to affect other platforms.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 compat/nedmalloc/malloc.c.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/compat/nedmalloc/malloc.c.h b/compat/nedmalloc/malloc.c.h
index f216a2a..bf70037 100644
--- a/compat/nedmalloc/malloc.c.h
+++ b/compat/nedmalloc/malloc.c.h
@@ -720,6 +720,9 @@ struct mallinfo {
   inlining are defined as macros, so these aren't used for them.
 */
 
+#ifdef __MINGW64_VERSION_MAJOR
+#undef FORCEINLINE
+#endif
 #ifndef FORCEINLINE
   #if defined(__GNUC__)
 #define FORCEINLINE __inline __attribute__ ((always_inline))
@@ -1382,6 +1385,7 @@ LONG __cdecl _InterlockedExchange(LONG volatile *Target, LONG Value);
 
   /*** Atomic operations ***/
   #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
+    #undef _ReadWriteBarrier
     #define _ReadWriteBarrier() __sync_synchronize()
   #else
     static __inline__ __attribute__((always_inline)) long __sync_lock_test_and_set(volatile long * const Target, const long Value)
-- 
2.7.0.windows.1.7.g55a05c8


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