Xcode error with cmake build of grpc

[Steven Smith]

I am unable to build grpc on a specific machine because of some Xcode error:

> make[2]: *** No rule to make target `/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreFoundation.framework', needed by `libgpr.14.0.0.dylib'.  Stop.

The relevant versions are:

> macOS 10.15.7 19H114
> Xcode 12.3 12C33
> 


This same Portfile builds grpc just fine on another 10.15 machine and indeed by the buildbot in this grpc PR: https://github.com/macports/macports-ports/pull/9729 .

This framework doesn’t exist on the machine,

> ls /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreFoundation.framework
> ls: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreFoundation.framework: No such file or directory


But rather this framework exists:

> ls -d /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/CoreFoundation.framework
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/CoreFoundation.framework/


I’ve tried reinstalling the command line tools per https://trac.macports.org/wiki/ProblemHotlist, and I’ve tried `sudo xcode-select -r`.

Any pointers to fix this local (?) issue would be appreciated.

Or is there some cmake directive that must be put in the Portfile to make this robust and find the framework that does exist?

Related: https://github.com/grpc/grpc/issues/24902



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