[PATCHv2] msvcrt: Export -f suffixed float functions functions on arm64

[Martin Storsjö]

Hi Piotr,

On Mon, 31 Jul 2017, Piotr Caban wrote:

> Why do you need it? Is there native arm64 version of the dlls (I've seen some 
> announcements but is it already available)?

I don't have the native arm64 version of the DLLs, but I do have 
corresponding import libs.

The public win10 SDK (from already 2 years ago) contains arm64 import 
libraries. There's no publicly available MSVC compiler targeting arm64 yet 
though (and I don't have any private one either), but I'm working on 
trying to bootstrap a build/test env for win/arm64.

Clang as compiler and lld as linker have gotten to the point now that they 
are pretty usable for building things for win/arm64, able to build pretty 
large real world projects - but the only environment I have for actually 
running the code is in wine so far.

In normal app code, built with clang and linked to the public win10 sdk 
import libs, I'm ending up with references to fabsf in 
api-ms-win-crt-math-l1-1-0.dll.

The part of the patch that touches msvcr80/90/100/110/120 was only done 
for consistency - in practice it's probably only needed for ucrtbase.dll.

(Similarly the case of -arch=arm in msvcr80/90/100 for arm probably isn't 
necessary since there's afaik nobody referencing those on arm, but it's 
probably easiest to keep them for consistency - that's why I'm adding it 
to all of them here as well.)

// Martin