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-rw-r--r--erts/emulator/beam/erl_async.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/erts/emulator/beam/erl_async.c b/erts/emulator/beam/erl_async.c
index cb975d64b0..d85c6feba7 100644
--- a/erts/emulator/beam/erl_async.c
+++ b/erts/emulator/beam/erl_async.c
@@ -122,6 +122,8 @@ typedef struct {
#endif
} ErtsAsyncData;
+#if defined(USE_THREADS) && defined(USE_VM_PROBES)
+
/*
* Some compilers, e.g. GCC 4.2.1 and -O3, will optimize away DTrace
* calls if they're the last thing in the function. :-(
@@ -129,6 +131,7 @@ typedef struct {
* https://github.com/memcached/memcached/commit/6298b3978687530bc9d219b6ac707a1b681b2a46
*/
static unsigned gcc_optimizer_hack = 0;
+#endif
int erts_async_max_threads; /* Initialized by erl_init.c */
int erts_async_thread_suggested_stack_size; /* Initialized by erl_init.c */
@@ -281,8 +284,8 @@ static ERTS_INLINE void async_add(ErtsAsync *a, ErtsAsyncQ* q)
len = -1;
DTRACE2(aio_pool_add, port_str, len);
}
-#endif
gcc_optimizer_hack++;
+#endif
}
static ERTS_INLINE ErtsAsync *async_get(ErtsThrQ_t *q,