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Now building LLVM myself

Ok I do need to debug CMake. It's giving CMAKE_C_COMPILER_ARCHITECTURE_ID = X86 when I certainly got aarch64 things

This is blocking LLVM build, but for now I'll just let it build with x86 compiler... But does MSVC support cross compiling? Am I building an x86 LLVM for absolutely no reason?

Given it's using Hostx86/x86/cl.exe I feel like it... For cross compiling it should at least use Hostx86/arm64. Oh no

Okay it's not CMake, it's either me or Microsoft. Because Developer Command Prompt by default uses x86 host with x86 target for no good reason. Oh no oh no

On x86-64 system I saw Developer Command Prompt (x64) but I don't see the same for arm64. Huh

With https://stackoverflow.com/a/41728434 I got mine and now everything points to ARM64 tools. This should work. Let's go!

A greatly reasonable person said me that just use x86 tools for less headache. I can't because I'm dumb. And that's absolutely slow for good reasons and I hate it

-- LLVM host triple: aarch64-pc-windows-msvc
-- Native target architecture is AArch64

I didn't read last time and it was x86. Now it's aarch64, everything should work now, right?

I feel like it's faster (of course should be faster without x86 emulation)

Some tags so that future dummies like me can solve their build problems #windows #aarch64 #arm64

BTW why aarch64/ARM64? Why couldn't we agree on choosing either one for everywhere?

So my build is almost done. I heard the binary distributions on #LLVM GitHub are uploaded by contributors, how do I do that?

So it was done, but from mach I got:

0:30.31 DEBUG: | wasm-ld: error: cannot open D:\llvm-project\build\lib\clang\18\lib\wasi\libclang_rt.builtins-wasm32.a: no such file or directory

so I'm building with compiler-rt again.

I'm just building with cmake alone, but maybe I should use https://searchfox.org/mozilla-central/source/build/build-clang/build-clang.py ...

But with SUPPORTED_TARGETS not including windows aarch64 I'm not sure, I'll try with pure cmake build first

And letting mach run is a different story because aarch64 python wants to compile all the wheels locally because pypi doesn't have them

With of course build failures. (That's the good thing with prebuilt wheels, )

cl : Command line warning D9002 : ignoring unknown option '-march=armv8-a'

Boo.

maybe I can re-cmake with the clang I built and then maybe it would work.

Dear me: Don't rewrite on the same build dir, that's dumb

@mhoye At least the build is going well, although taking forever. Already half of the way though, I hope it finish without error

@gabrielesvelto As AMD absolutely wanted AMD64 over x64?

@schmidt Haha the best day for this, no?