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

[Eric Astor via cfe-dev]

This line seems critical:

> clang-cl: error: clang frontend command failed due to signal (use -v to
> see invocation)
>

Have you tried rerunning with -v? The full invocation might be informative.

Best,
- Eric

On Tue, Nov 10, 2020 at 4:13 AM Gaier, Bjoern via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> 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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