Louis Dionne 98c4ea46bd [libc++] Improve diagnostic for libcxxabi missing from the runtimes (#208274) ...

When libc++ is configured to use libc++abi as an ABI library but
libcxxabi is not part of the runtimes, we'd end up with a confusing
build error about a missing <cxxabi.h> header. Instead, diagnose at
CMake configuration time.

Closes #136480

2026-07-14 07:59:40 -04:00

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HandleLibCXXABI.cmake

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HandleLibcxxFlags.cmake

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MacroEnsureOutOfSourceBuild.cmake

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