-
In commit 357e2ef4 (CheckSoureRuns: Add a unified way to check if a source runs, 2020-09-14, v3.19.0-rc1~118^2), the default Fortran source file extension was accidentally changed from `.F90` to `.F`. Fix that. In commit 10ae907d (CheckSoureCompiles: Add a unified way to check if a source compiles, 2020-09-14, v3.19.0-rc1~118^2~1), the default Fortran source extension was correctly preserved as `.F`, but `.F90` is a better default both for consistency and modern usage. Use that for direct calls to the `check_source_compiles` macro. Update our original `check_fortran_source_compiles` implementation to use `.F` by default as it did before. Fixes: #21307
1e519df0