[cfe-dev] RFC: __atomic_* support for gcc 4.7 compatibility

[Richard Smith]

On Tue, Apr 10, 2012 at 12:22 PM, Richard Smith <richard at metafoo.co.uk>wrote:

> 5) Clang provides an __atomic_init builtin, which gcc does not provide,
> and which crashes during CodeGen.
>

I should clarify: this builtin works fine on scalar types, but crashes in
cases like this:

  struct T { char v[4]; };
  _Atomic(T) a;
  void f() { __atomic_init(&a, T()); }

If this builtin is useful (in particular for C11, since neither libstdc++
nor libc++ need it), I'll take a look at fixing it instead of removing it.
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