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Brad King bf1bb62e74 macOS: Restore support for LLVM/Clang without explicit CMAKE_OSX_SYSROOT
In commit 7b19531291 (macOS: Do not pass any SDK/-isysroot to compilers
by default, 2024-11-06, v4.0.0-rc1~511^2) we broke support for using
upstream LLVM/Clang to build for macOS because the compiler has no
default sysroot.  Handle empty `CMAKE_OSX_SYSROOT` with LLVM/Clang by
falling back to the macOS SDK reported by `xcrun --show-sdk-path` .

Fixes: #26863
2025-05-02 13:49:40 -04:00
..
2024-07-16 12:28:19 -04:00