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- apple-compiler-selection
- ------------------------
- * Builds targeting macOS no longer choose any SDK or pass an ``-isysroot``
- flag to the compiler by default. Instead, compilers are expected to
- choose a default macOS SDK on their own. In order to use a compiler that
- does not do this, users must now specify ``-DCMAKE_OSX_SYSROOT=macosx``
- when configuring their build.
- * On macOS with :ref:`Ninja Generators` and :ref:`Makefile Generators`, when
- a compiler is found in ``/usr/bin``, it is now used as-is and is no longer
- mapped to the corresponding compiler inside Xcode. The mapping was
- introduced by CMake 3.2 to allow build trees to continue to work with their
- original compiler even when ``xcode-select`` switches to a different
- Xcode installation. However, the compilers inside Xcode cannot be used
- without explicit ``-isysroot`` flags and are therefore not suitable for
- passing to arbitrary third-party build systems. Furthermore, the mapping
- behavior can override user-specified compiler paths. Therefore, this
- behavior has been reverted.
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