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On modern macOS, compiler wrappers like `/usr/bin/cc` automatically choose a SDK to pass via `-isysroot` to an underlying compiler from Xcode or the CommandLineTools. Other toolchains like Homebrew's `gcc-*` come with a default SDK too. Therefore, when targeting macOS, we no longer need to choose any SDK or pass an `-isysroot` flag by default. Update initialization of `CMAKE_OSX_SYSROOT` to be empty by default when targeting macOS. Fixes: #19180