llvm installer on windows missing LLVMConfig.cmake

[funchal]

I have tried both the LLVM 13 and 12 installers (win64 versions) available on github on the Releases page -- both seem to be missing LLVMConfig.cmake, which causes cmake to error with

    CMake Error at CMakeLists.txt:9 (find_package):
      Could not find a package configuration file provided by "LLVM" with any of
      the following names:

        LLVMConfig.cmake
        llvm-config.cmake

I can see this file in the source distribution, so it seems to be just missing in the installer.

[funchal]

LLVMConfigExtensions.cmake is added in this install( statement but not LLVMConfig.cmake.

llvm-project/llvm/cmake/modules/AddLLVM.cmake

Line 1057 in a44ef99

${llvm_cmake_builddir}/LLVMConfigExtensions.cmake

[kleinesfilmroellchen]

Can confirm that the installer for 13 is missing llvm-config.

[retrooper]

Still?

[retrooper]

Any news on this as I can't get it working

[retrooper]

Even downgrading to llvm 11 didn't help

[retrooper]

Building LLVM is over 40 gigabytes on my system. Please fix the installer.

[kleinesfilmroellchen]

Building LLVM is over 90 gigabytes on my system and took me five days to get right. Please fix the installer. :^)

[ongamex]

Still an issue with 15.0.4

These is just this file LLVMConfigExtensions.cmake , containing a single line:
set(LLVM_STATIC_EXTENSIONS )

I need this in order to build - https://github.com/KhronosGroup/SPIRV-LLVM-Translator

[atorstling]

I'd like to resurface this one. I was trying to install https://github.com/p-ranav/fccf on windows, and now it turns out I need to build LLVM from source for that. So this might be a big usability problem for downstream tools that aren't shipping pre-built binaries.

I would vote instead of commenting if I could, sorry for the noise.

[hYdos]

Still an issue. Its a shame its not getting any attention and lowers usability

[joshfinley]

Tries to install LLVM from source - massive roadblocks
Tries to install LLVM from release - missing integral components
Looks up issue - unresolved for 568 days (its one file)

I understand that this project is a monster to maintain and there's only a handful of people maintaining it, but this is just sad.

[zmodem]

The Windows installer is focused on shipping LLVM as a toolchain: clang, lld, and related tools. It does not provide the LLVM development tools like opt, llc, etc. and also not the libraries and llvm-config.

There has been some discussion about shipping more tools in #51192, but shipping libraries is trickier. First of all we don't have a good way of building LLVM as a dll. We would also have to make sure the c runtime library matches what the client is using.

For these reasons, for users who want to use LLVM as a library or use the development tools, it's recommended to build LLVM from source.

If folks want to work on making LLVM easier to ship as a library on Windows, patches are welcome.

[kleinesfilmroellchen]

The Windows installer is focused on shipping LLVM as a toolchain: clang, lld, and related tools. It does not provide the LLVM development tools like opt, llc, etc. and also not the libraries and llvm-config.

One of the most useful and common applications of LLVM is embedding it as a library in another tool like a compiler. Not providing binaries for this purpose for a project that's so incredibly resource-intensive to build (on all accounts; disk space, memory usage, time) makes LLVM on Windows much less useful than it could be. I'm not convinced that shipping highly compatible libraries on Windows is a big issue given the high degree of compatibility in the Windows API layers, MSVC, and C library.

[GanbaruTobi]

llvm-config is still missing

[bamiaux]

PR #79840 exports a tarball containing llvm-config on windows