[Chapel Merge] Adjust common-c-backend to not set CHPL_LLVM

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Branch: refs/heads/main
Revision: d9b6406
Author: mppf
Link: Adjust common-c-backend to not set CHPL_LLVM by mppf · Pull Request #19693 · chapel-lang/chapel · GitHub
Log Message:

Merge pull request #19693 from mppf/test-extern-c-backend

Adjust common-c-backend to not set CHPL_LLVM

This PR removes CHPL_LLVM=none from common-c-backend.bash.

The reason to do that is to allow testing the C backend with a compiler built with extern block support.

By not setting CHPL_LLVM at all in common-c-backend.bash, we leave it to whatever script is calling it to set CHPL_LLVM as needed; or for the default to be used. In practice, I am expecting that a system LLVM will be detected in the configurations using common-c-backend.bash and that the quickstart configuration will continue to check CHPL_LLVM=none.

Resolves #5214.

Reviewed by @ronawho - thanks!

Modified Files:
M util/cron/common-c-backend.bash

Compare: https://github.com/chapel-lang/chapel/compare/5b6516bcf791...d9b640637d9b