[cfe-commits] [patch] Add the returns_twice attribute to know functions

[Rafael Ávila de Espíndola]

> I see added risk and added incompatibility with GCC, but no added
> value. I'd prefer that this go in as a Decl-only attribute for now,
> and we can revisit making it a type attribute down the road if we see
> any benefits.

I wrote a small testcase to check what gcc does. Compiling it with gcc I 
get a warning

warning: ‘returns_twice’ attribute ignored

and if optimizations are enabled both h1 and h3 are tail called, so it 
looks like gcc uses this as an decl only attribute. I will try to 
implement that.

> - Doug

Cheers,
Rafael
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