Quuxplusone added a comment.

If libc++ is using these macros, then I think it would be useful to include 
(the removal of) those uses in this PR.

  ../libcxx/include/atomic:#define ATOMIC_VAR_INIT(value) see below
  ../libcxx/include/atomic:#define ATOMIC_FLAG_INIT see below
  ../libcxx/include/atomic:#define ATOMIC_FLAG_INIT {false}
  ../libcxx/include/atomic:#define ATOMIC_VAR_INIT(__v) {__v}
  ../libcxx/src/barrier.cpp:            __atomic_base<__barrier_phase_t> 
__phase = ATOMIC_VAR_INIT(0);
  ../libcxx/src/experimental/memory_resource.cpp:        
ATOMIC_VAR_INIT(&res_init.resources.new_delete_res);
  ../libcxx/src/ios.cpp:atomic<int> ios_base::__xindex_ = ATOMIC_VAR_INIT(0);
  
../libcxx/test/libcxx/atomics/atomics.flag/init_bool.pass.cpp:std::atomic_flag 
global = ATOMIC_FLAG_INIT;
  ../libcxx/test/std/atomics/atomics.flag/init.pass.cpp:// atomic_flag() = 
ATOMIC_FLAG_INIT;
  ../libcxx/test/std/atomics/atomics.flag/init.pass.cpp:    std::atomic_flag f 
= ATOMIC_FLAG_INIT;
  
../libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_var_init.pass.cpp://
 #define ATOMIC_VAR_INIT(value)
  
../libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_var_init.pass.cpp:
    std::atomic<int> v = ATOMIC_VAR_INIT(5);
  
../libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/ctor.pass.cpp:
      constexpr Atomic a = ATOMIC_VAR_INIT(t);
  
../libcxx/test/std/thread/futures/futures.async/async.pass.cpp:std::atomic_bool 
invoked = ATOMIC_VAR_INIT(false);



================
Comment at: clang/test/Headers/stdatomic-deprecations.c:11
+void func(void) {
+  (void)ATOMIC_VAR_INIT(12); // expected-warning {{macro 'ATOMIC_VAR_INIT' has 
been marked as deprecated}} \
+                             // expected-note@stdatomic.h:* {{macro marked 
'deprecated' here}}
----------------
This doesn't look like correct use of the `ATOMIC_VAR_INIT` macro. It should be 
initializing an atomic, yeah?
(Note for example that if you did `(void)ATOMIC_FLAG_INIT(12)`, even with 
libc++'s implementation, it would just fail with a syntax error, because 
`(void){12}` is not a valid expression AFAIK.)


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D112221/new/

https://reviews.llvm.org/D112221

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