dim added inline comments.
================
Comment at: include/__config:724
@@ -719,1 +723,3 @@
+#endif
+
#ifndef _LIBCPP_HAS_NO_ASAN
----------------
mclow.lists wrote:
> I think that this needs more exploration; someone needs to look at the
> codegen.
>
> return x;
>
> is different from:
>
> return (x); // this is an expression
>
> I suspect that only one will trigger RVO.
>
Would you really think so? I would think the parentheses are superfluous, and
can be removed by parsing stages before it gets to RVO. But I will try to
check the codegen anyway.
Alternatively, since the macro is for 'internal use only', we might try to just
remove the parentheses, e.g.:
#ifdef _LIBCPP_HAS_NO_RVALUE_REFERENCES
# define _LIBCPP_EXPLICIT_MOVE(x) _VSTD::move(x)
#else
# define _LIBCPP_EXPLICIT_MOVE(x) x
#endif
It is a bit ugly, but at least the code itself does not have to be littered
with #ifdefs.
http://reviews.llvm.org/D11394
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