Define atomic_charN_t only if charN_t is supported.
Some platform code is apparently compiled with switches that do
not support char16_t and char32_t. This caused stdatomic.h to fail
to compile. This CL makes stdatomic.h usable in those environments.
(cherry picked from commit 8b002362d996859ebfc8588d6859a9a79203dc27)
Change-Id: Ie5a17f20b8b545c97128d00605b4eabd2a6bfe3e
diff --git a/libc/include/stdatomic.h b/libc/include/stdatomic.h
index 43ec753..669cefd 100644
--- a/libc/include/stdatomic.h
+++ b/libc/include/stdatomic.h
@@ -205,8 +205,10 @@
typedef _Atomic(unsigned long) atomic_ulong;
typedef _Atomic(long long) atomic_llong;
typedef _Atomic(unsigned long long) atomic_ullong;
-typedef _Atomic(char16_t) atomic_char16_t;
-typedef _Atomic(char32_t) atomic_char32_t;
+#if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L
+ typedef _Atomic(char16_t) atomic_char16_t;
+ typedef _Atomic(char32_t) atomic_char32_t;
+#endif
typedef _Atomic(wchar_t) atomic_wchar_t;
typedef _Atomic(int_least8_t) atomic_int_least8_t;
typedef _Atomic(uint_least8_t) atomic_uint_least8_t;
