[cfe-dev] Running LLVMHello Pass from Clang(-cl)

[Gaier, Bjoern via cfe-dev]

Hello everyone,

I build and run the LLVM (and clang) under Windows. I wanted to dive into the LLVM passes because I see a huge benefit in them for our project. So I made sure to configurate CMAKE with "CLANG_PLUGIN_SUPPORT", "LLVM_ENABLE_PLUGINS" and "LLVM_EXPORT_SYMBOLS_FOR_PLUGINS".
Except one project, everything build fine and I was able to execute "opt.exe" with the LLVMHello.dll - everything worked as expected!

However, then I tried using the DLL with Clang-Cl because this would be the way how to integrate it to our system. So I used:
clang-cl.exe -Xclang -load -Xclang LLVMHello.dll Test.cpp

However, this failed with:
clang-cl: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 12.0.0
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: D:\Program Files\LLVM_orc_removal\bin
clang-cl: note: diagnostic msg: Error generating preprocessed source(s).

If I remove the loading of LLVMHello.dll it works correctly again. I feel like, that LLVMHello.dll is not finding all the symbols needed. So I linked LLVMHello.dll with "clang.lib" instead of "opt.lib" - but with no success.

I also read that there are ways to include those passes directly into the source code of Clang, but I hoped to use this dynamic approach instead.

Any comments, ideas or something about this?

Kind greetings
Björn

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