qemu/atomic.h: add #ifdef guards for stdatomic.h

Deep inside the FreeBSD netmap headers we end up including stdatomic.h
which clashes with qemu's atomic functions which are modelled along
the C11 standard. To avoid a massive rename lets just ifdef around the
problem.

Signed-off-by: Alex Bennée <[email protected]>
Message-Id: <20200326170121[email protected]>
Reviewed-by: Richard Henderson <[email protected]>

diff --git a/include/qemu/atomic.h b/include/qemu/atomic.h
index f9cd24c8994b92a0f249f65dcb2c7b356b401c6e..ff72db51154ca9aeab8e46cfb548d594ef9e95f8 100644 (file)
--- a/include/qemu/atomic.h
+++ b/include/qemu/atomic.h
@@ -208,11 +208,14 @@
 /* Provide shorter names for GCC atomic builtins, return old value */
 #define atomic_fetch_inc(ptr)  __atomic_fetch_add(ptr, 1, __ATOMIC_SEQ_CST)
 #define atomic_fetch_dec(ptr)  __atomic_fetch_sub(ptr, 1, __ATOMIC_SEQ_CST)
+
+#ifndef atomic_fetch_add
 #define atomic_fetch_add(ptr, n) __atomic_fetch_add(ptr, n, __ATOMIC_SEQ_CST)
 #define atomic_fetch_sub(ptr, n) __atomic_fetch_sub(ptr, n, __ATOMIC_SEQ_CST)
 #define atomic_fetch_and(ptr, n) __atomic_fetch_and(ptr, n, __ATOMIC_SEQ_CST)
 #define atomic_fetch_or(ptr, n)  __atomic_fetch_or(ptr, n, __ATOMIC_SEQ_CST)
 #define atomic_fetch_xor(ptr, n) __atomic_fetch_xor(ptr, n, __ATOMIC_SEQ_CST)
+#endif
 
 #define atomic_inc_fetch(ptr)    __atomic_add_fetch(ptr, 1, __ATOMIC_SEQ_CST)
 #define atomic_dec_fetch(ptr)    __atomic_sub_fetch(ptr, 1, __ATOMIC_SEQ_CST)
@@ -392,11 +395,14 @@
 /* Provide shorter names for GCC atomic builtins.  */
 #define atomic_fetch_inc(ptr)  __sync_fetch_and_add(ptr, 1)
 #define atomic_fetch_dec(ptr)  __sync_fetch_and_add(ptr, -1)
+
+#ifndef atomic_fetch_add
 #define atomic_fetch_add(ptr, n) __sync_fetch_and_add(ptr, n)
 #define atomic_fetch_sub(ptr, n) __sync_fetch_and_sub(ptr, n)
 #define atomic_fetch_and(ptr, n) __sync_fetch_and_and(ptr, n)
 #define atomic_fetch_or(ptr, n) __sync_fetch_and_or(ptr, n)
 #define atomic_fetch_xor(ptr, n) __sync_fetch_and_xor(ptr, n)
+#endif
 
 #define atomic_inc_fetch(ptr)  __sync_add_and_fetch(ptr, 1)
 #define atomic_dec_fetch(ptr)  __sync_add_and_fetch(ptr, -1)