CMake: refactor for clarity and generality

HDFGroup / hdf4

Official HDF4 Library Repository

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Closed scivision closed 4 weeks ago

scivision commented 1 month ago

Each commit is independent, combined into one PR for convenience

add_definitions() => add_compile_definitions() recommended for generality across compilers
set policy implicitly, remove no-op policies already implied
remove redundant directory checks

scivision commented 1 month ago

the CI failures appear to be all transient 503 with Chocolaty downloading Ninja