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Brad King authored
The parent commit introduced a separate "AppleClang" compiler id for Apple's Clang distribution. Add a policy in order to support projects that expect this compiler's id to be just "Clang". When the policy is OLD or not set, map AppleClang back to Clang. Continue to use the AppleClang id internally while enabling the language, but set the CMAKE_<LANG>_COMPILER_ID after project() or enable_language() to the compatible value for use by project code.
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