libllvm: add package.

[Redbeanw44602]

Differs from xmake-repo/llvm

1. This package is provided as a library, not a toolchain.
2. Real support for 19.1.7
3. More extensive cross-compilation support.

Packaging principles

Keep llvm-project as default as possible, that is, keep xrepo as little as possible without making choices for the user.

Should splitting packages?

I discussed splitting the package with @star-hengxing in the telegram group, but I later thought that LLVM was more like a whole, so I didn't split it. If there are more opinions, we can discuss it.

[Redbeanw44602]

Possible test failures

I have run the same tests in my own repo and based on my experience, the following test will not pass, but it actually works.

• android (linux, ndk_r22) 4 tests failed. This version of ndk creates huge library files that fill up the disk when building, causing failures. By the way, even if you clean the runner disk space, the compilation cannot be completed. It will eventually be killed due to excessive usage. ndk r22 is really worst!
• freebsd The compilation cannot be completed. In fact, the memory size given by xrepo to the freebsd vm is unreasonable. Ubuntu runner provides 16g of memory while freebsd only has 4g. It will be killed due to oom during tblgen. (resolved in lzma: update to 24.09 #6967)

[Copilot]

Pull Request Overview

This PR introduces a new package "libllvm" that provides LLVM as a library with extended cross-compilation support and real support for version 19.1.7.

• Adds configuration and build instructions for the LLVM library package.
• Implements cross-compilation logic for Android and iOS.
• Provides helper functions via a new constants module to manage project and runtime library lists.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
packages/l/libllvm/xmake.lua	Introduces package configuration, dependency management, and CMake build integration.
packages/l/libllvm/constants.lua	Provides helper functions to retrieve lists of LLVM-related projects and libraries.

[Redbeanw44602]

The import of DIA SDK (windows-only) has a little problem, waiting:
xmake-io/xmake#6452
xmake-io/xmake#6453

[Redbeanw44602]

Can someone merge #7175 first? This saves one test.

[Redbeanw44602]

Looks like xmake-io/xmake@d98c1ab broke this package, we need to undefine BUILD_SHARED_LIBS.

[star-hengxing]

Looks like xmake-io/xmake@d98c1ab broke this package, we need to undefine BUILD_SHARED_LIBS.

import("package.tools.cmake")

local opt = {}
opt.envs = cmake.buildenvs(package)
opt.envs.CMAKE_BUILD_TYPE = nil
cmake.install(package, configs, opt)

[Redbeanw44602]

Thanks for your reply. But this doesn't seem to work, except modifying the xmake source code, we can't undefine that variable.🙁

But... I found that simply keeping BUILD_SHARED_LIBS=OFF seemed to work as expected, so now I run a test.

[Redbeanw44602]

I think the package is ready to merge, all the tests failing are with code 143.

actions/runner-images#6680

[luadebug]

[660/4518] This one is very huge?
I am sorry, that I am unsure that producing very long build package is okay without splitting it into smaller parts. :/

[Redbeanw44602]

[660/4518] This one is very huge?

When a job is interrupted by github, the log may not be dumped completely.

Try viewing the raw logs and you'll get:

Failed to generate URL to download logs.

So, it is hard to determine what caused the job to be interrupted. If you run it on local machine (same environment), it will succeed.

[luadebug]

#7286
Github CI Worker has been promoted from win2019 to win2025.