VS: Restore compilation of '.C' sources as C++ (!4880) · Merge requests · CMake / CMake

Brad King requested to merge brad.king/cmake:vs-lang-C into master Jun 11, 2020

Refactoring in !4761 (merged) failed to account for MSVC's treatment of .C extensions as C. Add this special case to the logic to restore use of -TP for .C extensions.

Fixes: #20822 (closed)
Backport: release

VS: Restore compilation of '.C' sources as C++

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