Add Windows llvm debug build

[mcbarton]

This PR should allow Clad to be tested against the head of release branch of llvm on Windows.

[vgvassilev]

Looks like the bots are not picking up these changes, right?

[mcbarton]

@vgvassilev They only build llvm on Windows if debug=true in the ci. If you look at the first commit where I forgot to add this condition, the ci is building llvm on Windows before I stopped the job.

[vgvassilev]

@vgvassilev They only build llvm on Windows if debug=true in the ci. If you look at the first commit where I forgot to add this condition, the ci is building llvm on Windows before I stopped the job.

Can we make a new configuration that builds llvm on windows, caches it and builds clad against it?

[codecov]

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[mcbarton]

@vgvassilev This PR is ready for review. If you look at the ci it uses the built cache to build Clad. If you merge, remember to clear the cache before you merge. I'll put in a PR at some point to reduce the size of the cache.

[vgvassilev]

@vgvassilev This PR is ready for review. If you look at the ci it uses the built cache to build Clad. If you merge, remember to clear the cache before you merge. I'll put in a PR at some point to reduce the size of the cache.

I think we will need a bit more to this. We need to compile with clang-cl to be able to pick up the windows exports. We should use something like cmake -GNinja -DLLVM_ENABLE_PROJECTS=clang -DCMAKE_BUILD_TYPE=RelWithDebInfo -DLLVM_TARGETS_TO_BUILD=host -DLLVM_ENABLE_PLUGINS=On ..\llvm

Then we need to compile clad with: cmake -DCMAKE_BUILD_TYPE=Debug -DLLVM_DIR=c:\vv-llvm-dev\llvm-project\build -GNinja -DLLVM_BUILD_LLVM_DYLIB_VIS=On -DLLVM_LINK_LLVM_DYLIB=On -DCLANG_LINK_CLANG_DYLIB=On ..\clad

[mcbarton]

@vgvassilev I'll do this once you clear the cache for this PR. I'll also try and reduce the size of the cache at the same time.

[vgvassilev]

@vgvassilev I'll do this once you clear the cache for this PR. I'll also try and reduce the size of the cache at the same time.

Done!

[mcbarton]

@vgvassilev I've made the changes you requested (using clang-cl to build llvm, and use certain options when building clad), but it fails with a linker error when building llvm. Any suggestions of a fix?

[vgvassilev]

Are there any news on this?

[mcbarton]

Now that the llvm this PR is building is llvm 20 (temporarily a fork of the llvm-project until the changes are upstream) this PR shall wait for #1267 to go in.