[builtins] Fixing atomic builtins to be compiled out if stdatomic.h isn't available.

This should fix the bots broken by r248322.

Reviewed by bogner over my shoulder.

llvm-svn: 248328

compiler-rt/lib/builtins/atomic_flag_clear.c

@@ -12,8 +12,12 @@
  *===------------------------------------------------------------------------===
  */
 
+#if __has_include(<stdatomic.h>)
+
 #include <stdatomic.h>
 #undef atomic_flag_clear
 void atomic_flag_clear(volatile atomic_flag *object) {
   return __c11_atomic_store(&(object)->_Value, 0, __ATOMIC_SEQ_CST);
 }
+
+#endif

compiler-rt/lib/builtins/atomic_flag_clear_explicit.c

@@ -12,9 +12,13 @@
  *===------------------------------------------------------------------------===
  */
 
+#if __has_include(<stdatomic.h>)
+
 #include <stdatomic.h>
 #undef atomic_flag_clear_explicit
 void atomic_flag_clear_explicit(volatile atomic_flag *object,
                                 memory_order order) {
   return __c11_atomic_store(&(object)->_Value, 0, order);
 }
+
+#endif

compiler-rt/lib/builtins/atomic_flag_test_and_set.c

@@ -12,8 +12,12 @@
  *===------------------------------------------------------------------------===
  */
 
+#if __has_include(<stdatomic.h>)
+
 #include <stdatomic.h>
 #undef atomic_flag_test_and_set
 _Bool atomic_flag_test_and_set(volatile atomic_flag *object) {
   return __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST);
 }
+
+#endif

compiler-rt/lib/builtins/atomic_flag_test_and_set_explicit.c

@@ -12,9 +12,13 @@
  *===------------------------------------------------------------------------===
  */
 
+#if __has_include(<stdatomic.h>)
+
 #include <stdatomic.h>
 #undef atomic_flag_test_and_set_explicit
 _Bool atomic_flag_test_and_set_explicit(volatile atomic_flag *object,
                                         memory_order order) {
   return __c11_atomic_exchange(&(object)->_Value, 1, order);
 }
+
+#endif

compiler-rt/lib/builtins/atomic_signal_fence.c

@@ -12,8 +12,12 @@
  *===------------------------------------------------------------------------===
  */
 
+#if __has_include(<stdatomic.h>)
+
 #include <stdatomic.h>
 #undef atomic_signal_fence
 void atomic_signal_fence(memory_order order) {
   __c11_atomic_signal_fence(order);
 }
+
+#endif

compiler-rt/lib/builtins/atomic_thread_fence.c

@@ -12,8 +12,12 @@
  *===------------------------------------------------------------------------===
  */
 
+#if __has_include(<stdatomic.h>)
+
 #include <stdatomic.h>
 #undef atomic_thread_fence
 void atomic_thread_fence(memory_order order) {
   __c11_atomic_thread_fence(order);
 }
+
+#endif