[0/6] llvm-mingw port

[Jacek Caban]

Hi,


This patch series includes most required changes to build Wine with 
llvm-mingw:

https://github.com/mstorsjo/llvm-mingw

On top of upstream llvm-mingw, the attached patch is needed. Related 
changes not covered by this patch series are:


- We need trunk version of LLVM/clang

Martin has made a few changes to LLVM (mostly LLD linker) that are 
required by Wine. The attached patch changes scripts to use recent 
enough versions. This will not be needed once they are in stable version.


- libgcc should not be hardcoded

Compiler may use different library for its builtins and llvm-mingw does 
that. It uses compiler_rt. We should probably run $CC 
--print-libgcc-file-name inside winebuild instead of hardcoding -lgcc. 
It shouldn't be too hard, but I didn't look at it yet. The attached 
patch changes toolchain to provide a symlink as a temporary workaround.


- We need to support MSVC-style delay imports

I currently use this patch:

https://source.winehq.org/patches/data/167998

Martin added a bit nicer option to recent LLD, so we could just use 
-delayload without -Xlink now. I also have some ideas about moving the 
logic to winegcc/winebuild instead of configure/makedep, but I don't 
have patch ready yet.


- You need to pass CROSSCFLAGS=-fno-builtin-exp2 to configure.

Compiler is free to optimize pow(2, x) to exp2(x) and clang does that. 
exp2, however, is not exposed by most msvcrt versions and it's not as 
easy to workaround as other functions from mathf.c. Since we will need 
in-tree implementation of exp2 to migrate crt DLLs to PE files anyway, 
it should be straightforward to include that in static lib.



That said, simple instructions to test it are:

1. clone llvm-mingw git

2. patch it with the attached patch

3. From there, run ./build-all.sh /install/path

4. Add /install/path/bin to PATH

5. Configure Wine as usually, with additional 
CROSSCFLAGS=-fno-builtin-exp2 option


I tested x86 and x86_64 builds, but I'd expect arm and aarch64 to mostly 
work as well.


Cheers,

Jacek

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