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Christian Pfeiffer authored
This MR fixes a number of bugs stemming from legacy variable handling, partially introduced by commit v3.10.0-rc1~103^2 (FindMPI: Add support for FreeBSD and SLES, 2017-08-09). * `MPI_COMPILE_OPTIONS` and `MPI_COMPILE_DEFINITIONS` legacy hints were not passed correctly. * Legacy variables could be parsed after they were set by `FindMPI` cause erroneous hinting on subsequent runs. * In the case of the compiler supporting MPI implicitly: * not all consumption variables would be correctly reset. * `MPI_<LANG>_HEADER_DIR` would be set unintentionally. * `MPI_<LANG>_LIB_NAMES` appeared in cache despite being ignored. * on subsequent passes, `MPI_<LANG>_COMPILER` could be corrupted. * the C-to-CXX copy logic would take place even if `MPI_SKIP_GUESSING` was turned on * if only some language compilers were given, inconsistent search behavior could be observed Issue: #17538
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