Also: isn't that a bug? Is there something in a C / C++ standard that states that a function named "memcpy" (for example) is necessarily the normal function?
Compilers have been doing this for a long time. The optimizations that this enables are essential for performance. They shouldn't stop; if the spec prohibits it, the spec should change (and if it doesn't, the compilers should ignore the spec).
And as for the second part... Meh. I don't see any optimizations that hard-coding calling something named "memcpy" (or whatever) does that cannot be enabled by looking at the actual code that gets linked. Albeit with more difficulty.
