Could not find a working Foundation implementation while upgrading from 2.3.4 to 2.3.5

[Jaymzu]

Hey there, I got the notification about 2.3.5 being released and I tried the update this morning and it failed with the error in the $subj. Most similar tickets are marked as worksforme but for whatever reason, in many years of using macports, I haven't seen it before.

sudo port -v selfupdate output attached.

[Jaymzu]

port selfupdate output

[neverpanic (Clemens Lang)]

Please attach /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/base/config.log. Do you have the Command Line Tools installed?

[Jaymzu]

• config.log attached in the original post
• yes, command line tools are installed.

[neverpanic (Clemens Lang)]

Your /usr/bin/cc compiler does not understand the extensions used in the Foundation headers.

configure:7483: /usr/bin/cc -o conftest -g -O2   conftest.m -framework Foundation  >&5
	In file included from conftest.m:26:
	In file included from /System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:10:
	In file included from /System/Library/Frameworks/Foundation.framework/Headers/NSArray.h:5:
	/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:44:12: error: unknown property attribute 'class'
	@property (class, readonly) BOOL supportsSecureCoding;
	           ^

What's /usr/bin/cc --version on your system?

[Jaymzu]

/usr/bin/cc --version Apple LLVM version 7.3.0 (clang-703.0.29) Target: x86_64-apple-darwin16.1.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

[neverpanic (Clemens Lang)]

You're on Sierra, but your Command Line Tools are not the Xcode 8.x ones (see XcodeVersionInfo#Xcode8.1). Update your Command Line Tools.

[raimue (Rainer Müller)]

Should we extend the ​Xcode version check with an additional check if the CommandLineTools match the Xcode version? Note that this would not have helped for this selfupdate problem, as it is only checked on port builds, but users would at least be warned at some point.

[Jaymzu]

My apologies on this. I just realised that I didn't update Xcode after switching to Sierra.

[larryv (Lawrence Velázquez)]

Replying to raimue:

Should we extend the ​Xcode version check with an additional check if the CommandLineTools match the Xcode version?

Not a bad idea, although this would have to special-case Xcode 8 + Xcode 7 CLT on El Capitan.