[Chapel Merge] Allow building GPU support with host compilers oth

Branch: refs/heads/main
Revision: 596bf2e
Author: daviditen
Link: https://github.com/chapel-lang/chapel/pull/19172
Log Message:

Merge pull request #19172 from daviditen/gpu-no-require-clang

Allow building GPU support with host compilers other than clang

[reviewed by @stonea]

We need clang/llvm as the target compiler for GPU support, but
not as the host compiler. Don't force clang for host or issue an
error if it isn't available.

Signed-off-by: David Iten daviditen@users.noreply.github.com

Modified Files:
M util/chplenv/chpl_compiler.py

Compare: https://github.com/chapel-lang/chapel/compare/3ccded6aca9b...596bf2e08ccf