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David authored
Removal of those variables is done for multiple reasons: - In general, the caller should set correct variables for compilers, this should not be done by the script itself - In recent macOS versions, default stubs for compilers exist (/usr/bin/clang / gcc / cc), so there is not need to use xcrun anymore - Some contribs fail to build with the multi-command notion given by xcrun cc, instead they are looking for a tool named "xcrun cc" which does not exist
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