I have a application, I wrote 6 years ago, which includes functionality to compare files. Recently this seems to ignore the compare files command. I did a little digging into the code, and this uses
opendiff to perform this function.
I will try to dive into the code to follow up, but my question relates to some of my findings.
There are 2 instances of
/Applications/Xcode.app/Contents/Developer/usr/bin/opendiff -rwxr-xr-x 1 root wheel 23712 5 Jun 13:22 /Applications/Xcode.app/Contents/Developer/usr/bin/opendiff /usr/bin/opendiff -rwxr-xr-x 1 root wheel 18304 30 May 09:35 /usr/bin/opendiff
Running the first works as expected.
Running the second produces the following error
xcode-select: error: tool 'opendiff' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
This error is incomprehensible (at least to me), and I do not know where this came from.
I suspected Command Line Tools may be implicated, and I did install brew 2 days ago (to get an up-to-date rsync)
I would just delete
/usr/bin/opendiff, but cannot - probably due to SIP.
I just booted up my MacBook Pro running 10.13.3 and all seems OK.
/usr/bin/opendiff runs, and starts FileMerge 2.10