0c44a9a504
* bugfix: make compiler preferences slightly saner This fixes two issues with the way we currently select compilers. If multiple compilers have the same "id" (os/arch/compiler/version), we currently prefer them by picking this one with the most supported languages. This can have some surprising effects: * If you have no `gfortran` but you have `gfortran-8`, you can detect `clang` that has no configured C compiler -- just `f77` and `f90`. This happens frequently on macOS with homebrew. The bug is due to some kludginess about the way we detect mixed `clang`/`gfortran`. * We can prefer suffixed versions of compilers to non-suffixed versions, which means we may select `clang-gpu` over `clang` at LLNL. But, `clang-gpu` is not actually clang, and it can break builds. We should prefer `clang` if it's available. - [x] prefer compilers that have C compilers and prefer no name variation to variation. * tests: add test for which() |
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