This is a cobbled-together CMake toolchain file for using “hermetic Xcode”, rather than the system-installed one. It is not used by default. It is meant to be used on automated builder bots to avoid depending on system dependencies, but can also be used locally.

Use this by passing -DCMAKE_TOOLCHAIN_FILE=path/to/HermeticXcode.cmake to cmake.

Notes:

• Not all of the variables set in the script are probably actually used (and thus could break later on if they become used), but are included in an attempt at completeness.
• ranlib is a link to libtool because those are the same binary with different names. (It needs to be a symlink because it chooses its behavior based on its filename.)
• It doesn't currently try to set up other things as hermetic, in particular Python.