The <stdatomic.h> macro ATOMIC_VAR_INIT, previously declared obsolete,
is removed completely in C2x; disable it for C2x in GCC's
implementation. (Although ATOMIC_* are reserved names for this
header, disabling the macro for C2x still seems appropriate.)
Bootstrapped with no regressions for x86_64-pc-linux-gnu.
gcc/
* ginclude/stdatomic.h [defined __STDC_VERSION__ &&
__STDC_VERSION__ > 201710L] (ATOMIC_VAR_INIT): Do not define.
gcc/testsuite/
* gcc.dg/atomic/c2x-stdatomic-var-init-1.c: New test.
typedef _Atomic __UINTMAX_TYPE__ atomic_uintmax_t;
+#if !(defined __STDC_VERSION__ && __STDC_VERSION__ > 201710L)
#define ATOMIC_VAR_INIT(VALUE) (VALUE)
+#endif
/* Initialize an atomic object pointed to by PTR with VAL. */
#define atomic_init(PTR, VAL) \
--- /dev/null
+/* Test ATOMIC_VAR_INIT not in C2x. */
+/* { dg-do compile } */
+/* { dg-options "-std=c2x -pedantic-errors" } */
+
+#include <stdatomic.h>
+
+#ifdef ATOMIC_VAR_INIT
+#error "ATOMIC_VAR_INIT defined"
+#endif