Created by: robbertvanginkel
Not all of Apple's system frameworks have correct modular headers.
Adding the $SDKROOT in a -F flag triggers an attempt of clang to
create a module for these, which gives unexpected errors.
Omitting the $SDKROOT is not an issue when the -sdk flag is passed to
clang/swiftc. When generating a new project in Xcode, it does not
include the $SDKROOT variable in FRAMEWORK_SEARCH_PATHS by
default.
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