Arch Linux User Repository

During building you may encounter lots of coredumps, slowing build down or even dramatically reducing the responsiveness of your system.

See https://wiki.archlinux.org/title/Core_dump for solutions/workarounds .

Archlinux currently has 3 llvm git implementations

1. this package

   • see other pinned comments for details

2. llvm-git

   • It aims to provide a full llvm/clang compiler environment for development purposes.
   • Supports cross-compiling , bindings for external stuff (python, ocaml etc) , and some things not in extra-llvm.
   • intended to be used with archlinux core,extra & community repos
   • CONFLICTS with extra llvm/clang packages
   • binary versions in chaotic aur unofficial repository

3. packages created & maintained by Lordheavy, an arch developer

   • intended to be used with archlinux testing repos
   • sometimes has problems on systems where testing repos are disabled
   • uses same package structure as llvm/clang in official repos
   • source
   • binary versions in LordHeavys unoffical repo

Why does this package exist ?

Llvm & aur llvm-git are intended to provide a full development environment of llvm/clang suite that can replace eachother completely (aur llvm-git adds some xtra functionality)

llvm-minimal-git is a stripped-down llvm trunk build with these goals :

• llvm-libs-minimal-git must coexist with stable llvm-libs
• provide what's needed for mesa trunk (it's a hard dependency for mesa-minimal-git and a possible dependeny for mesa-git)
• provide basic llvm/clang compiler functionality on x86-64 architecture

Some of the things that are stripped out :

• cross-compiling support
• bindings for ocaml
• bindings for go
• lld , lldb and polly
• documentation
• examples
• benchmarks

Maintainers (and users) should only depend on llvm-miminal-git after verifying it satisfies what they need.

When building this you are likely to see test failures in terminal output / logs.

The command used for the tests has been changed to continue regardless of failures. Incase you don't want to run the tests you can use --nocheck option of makepkg.

Due to the aur being down that package was not findable.

Besides that the fix for this issue was only merged to rust-bindgen main 5 days ago.

For almost 3 weeks pinning the llvm version was the only available solution.

rust-bindgen 72.1 with the fix has been released and I flagged the archlinux repo version out-of-date .

For now a local rust-bindgen 72.1 package or rust-bindgen-git is best solution.

Better way for using mesa-git with latest llvm-git is by change dependencies to rust-git , rust-bindgen-git instead ...for me work greate for all ...and its future proof

https://github.com/llvm/llvm-project/commit/91cdd35008e9ab32dffb7e401cdd7313b3461892 breaks rust-bindgen and makes mesa-minimal-git build fail .

The last commit that works is fc44a4f , pin llvm-minimal-git on that commit if you aim to use it for mesa.

For more info follow https://gitlab.freedesktop.org/mesa/mesa/-/issues/13757

build the same commit of llvm-git & llvm-minimal-git , then try installing them again.

While pacman will allow it at first, i'd be very surprised if it didn't detect file conflicts and abort before finishing installing .

In case the 3rd pinned comment isn't clear enough

-D LLVM_ENABLE_PROJECTS="polly;lldb;lld;compiler-rt;clang-tools-extra;clang" \

-D LLVM_ENABLE_PROJECTS="clang-tools-extra;clang"

first line is from llvm-git , 2nd from llvm-minmal-git .

Just found out that this package can happily sit installed next to llvm-libs-git.

Don't the two packages provide the same thing?

no，you need install mesa-git and mesa-git's runtime if mesa-git is built with llvm-minimal-git，it will need llvm-libs-minimal-git as dependence

Oh, so mesa-git just need to be build with llvm-minimal-git, but at runtime it works well with stock llvm?

that is a possibilty, but the recommended method is to setup "clean chroot building" to separate runtime & build environments .

See https://wiki.archlinux.org/title/DeveloperWiki:Building_in_a_clean_chroot

Got that. So this basically mean that if I want mesa-git on my machine I would probably need to replace the whole llvm suite to avoid issues?

I'll look into moving those files to clang-minimal-git which has a conflict with repo clang so pacman won't allow installing both .

I do think having repo clang & llvm-minimal-git installed together is a bad idea and can cause issues.

Also keep in mind that llvm-libs-minimal-git is the only part needed at runtime and customized to coexist with repo llvm-libs .