llvm 10.0.0

[Manu343726]

Specify library name and version: llvm/10.0.0

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

Related to #683

This PR implements a llvm recipe by using current llvm source structure on github.
All llvm projects are now maintained under the same git repository, with a LLVM_ENABLE_PROJECTS
CMake option to enable the different projects. I have listed all (Including openmp @jgsogo) and mapped them
to package options (clang and compiler-rt are enabled by default, but we can discuss this).

The package includes The official LLVM frontend tutorial as test_package/.

Note the package has no dependencies, but we know llvm has some external dependencies (libtinfo) that are not currently available in conan-center-index.
After talking with @jgsogo I have decided to push this recipe as a first version we can continue working with. I haven't had time to test
the recipe on Windows, but I'm sure it should be working since the recipe does nothing special and just calls the llvm cmake with the documented
configuration. Anyway, I will be glad if someone could test it for me.

[Manu343726]

WHAT I don't know what that means, I literally copied the config from my previous stlab recipe...
I need some CCI expert :)

[madebr]

@Manu343726

You need to rename config.yaml to config.yml

[madebr]

I haven't had time to test
the recipe on Windows, but I'm sure it should be working since the recipe does nothing special and just calls the llvm cmake with the documented
configuration. Anyway, I will be glad if someone could test it for me.

It started building on Visual Studio but I stopped the build because I did not have enough free space and it required a lot of CPU power (which impeded my other work).

I noticed that it requires Z3, so I opened #1451

[Manu343726]

@Manu343726

You need to rename config.yaml to config.yml

Ouch.... Thank you

[jgsogo]

I would love to monitor how many resources this build consumes in the CI 😅 This is going to be huge, let's work on those dependencies

🙌

---

Note.- We'll try to improve that error message, but it won't be the highest priority right now

[Manu343726]

It will be great if you can list the dependencies of the subprojects you know, like openmp.

I will change the recipe to use conandata.yml to list the projects and its deps (to keep the recipe clean)

[madebr]

I think you're too restrictive. Visual Studio 2017 is version 15.
(see the generator section of cmake --help)

[Manu343726]

Nope, see the previous build error:

CMake Error at cmake/modules/CheckCompilerVersion.cmake:38 (message):
  Host Visual Studio version must be at least 19.1, your version is
  19.0.24215.1.
Call Stack (most recent call first):
  cmake/modules/CheckCompilerVersion.cmake:51 (check_compiler_version)
  cmake/config-ix.cmake:13 (include)
  CMakeLists.txt:623 (include)

[madebr]

19.0.24215.1 is the version of the C compiler, not the version of visual studio.

Look at personal your conan settings file: $HOME/.conan/settings.yml.
There exists no Visual Studio compiler whose version >= 19.1.
Or check https://en.wikipedia.org/wiki/Microsoft_Visual_Studio#2019.
Visual Studio 2019 => version 16.

[madebr]

https://github.com/llvm/llvm-project/blob/master/llvm/cmake/modules/CheckCompilerVersion.cmake#L53-L64

So host Visual Studio version 16.4 and lower is known to miscompile part of LLVM.

• That means only up-to-date versions of visual studio 2019 can build llvm.
• This also means that the test in configure must compare against the major.minor version of MSVC (16.4) instead of only major (16).

[Manu343726]

[HOOK - conan-center.py] post_package(): ERROR: [CMAKE-MODULES-CONFIG-FILES (KB-H016)] The conan-center repository doesn't allow the packages to contain CMake find modules or config files. The packages have to be located using generators and the declared cpp_infoinformation (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H016)

Hehe, conan-center-index policies do not allow usage of root llvm project with their documented CMake modules (Which is what you find in 99% of tutorials). So one more +1 to my previous comment :P

[blockspacer]

@Manu343726
Note that current recipe lacks sanitizer options, see "LLVM_USE_SANITIZER" and "COMPILER_RT_BUILD_SANITIZERS" as example from https://github.com/blockspacer/conan_llvm_9/blob/master/conanfile.py

[tcanabrava]

Anything that I can do to help this pass, as I would like very much to use libclang on windows / mac?

[ghost]

I detected other pull requests that are modifying llvm/all recipe:

• package: llvm/13 - llvm/16 #17509
• LLVM 13 and 14 #7613

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[conan-center-bot]

Failure in build 2 (258c6fb677296994672767ebd7f9119e3753950b):

An unexpected error happened and has been reported. Help is on its way! 🏇

[jcar87]

We are currently not prioritising packages that add toolchains (rather than libraries or pure executables), as we are prioritising other issues in our backlog.

LLVM itself has a myriad of components, and I suspect different users would have different needs. We are opening this issue to track this: #23834 - actual uses cases with examples will help the team gain better insights at how a potential llvm recipe may be used, whether or not it is worth packaging different LLVM components in separate recipes, and so on. Any information of this would be appreciated in that issue so that we can move forward, thanks!