[libcxx-commits] [PATCH] D138629: [libc++][math.h] Add double overloads

[Aaron Ballman via Phabricator via libcxx-commits]

aaron.ballman added a comment.

In D138629#3960439 <https://reviews.llvm.org/D138629#3960439>, @philnik wrote:

> In D138629#3954442 <https://reviews.llvm.org/D138629#3954442>, @aaron.ballman wrote:
>
>>> 4. More generally speaking, what's the purpose of `-fno-builtins`?
>>
>> To disable all builtins regardless of whether you're in freestanding mode or not. Sometimes the builtins do things you don't want them to do and so you want to disable them (perhaps you don't like the behavior of `__builtin_memcpy` for some reason), and sometimes the builtins expose names you want to use (https://godbolt.org/z/cMxzojcr1).
>
> `__buitin_memcpy` works the same whether `-fno-builtins` is used or not, right? It's just that `memcpy` doesn't behave like `__builtin_memcpy`?

Correct, sorry for being unclear.


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https://reviews.llvm.org/D138629