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Preserve CMAKE_<LANG>_COMPILER_ARG1 from existing CMakeCache.txt

Thorsten Klein requested to merge thorsten-klein/cmake:fix-compiler-determination-ARG1 into master

CMAKE_<LANG>_COMPILER may be a list if it was defined by a toolchain file. In this case we move the args to CMAKE_<LANG>_COMPILER_ARG1. If CMAKE_<LANG>_COMPILER is not a list, then it might have been cached by a previous run that split the CC or CXX environment variable into CMAKE_<LANG>_COMPILER and CMAKE_<LANG>_COMPILER_ARG1. In this latter case, avoid clobbering CMAKE_<LANG>_COMPILER_ARG1.

Fixes: #23358 (closed)
Topic-rename: preserve-compiler-arg1

Edited by Brad King

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