Two quick tips for fixing some troubles with developer tools. I ran into both today, though they are likely unrelated. I couldn’t find much about it online, so here goes.

FileMerge won’t open for third party app

When trying to view differences using GitBox, nothing would happen. This symptom started after I had installed a beta version of Xcode. Once I realized that GitBox opens FileMerge via the command line utlity opendiff the fix was easy: selecting the proper Xcode installation.

This is done as such:

xcode-select -switch /path/to/developer-folder

Symbolicating crash logs failed

When trying to symbolicate some crash logs I got this error:

Error: Can't run /usr/share/xcode-select/xcrun (no such file).

This was somewhat puzzling, because also on my other Mac, where symbolicating crash logs did work, there was no such file.

The command line utility xcrun is by the way what is used by a number of scripts to find out which Developer folder to use.

Luckily the fix turned out to be quite straightforward: reinstall xcrun. Simply reinstalling Xcode does the trick, or you can take the shortcut I took, and go into the Install Xcode bundle to find xcrun.pkg in /Contents/Resources/Packages/.

Once that installer package was installed, xcrun ran happily again.

To symbolicate crash logs you run this command:

/Developer/Platforms/iPhoneOS.platform/Developer/Library/PrivateFrameworks/DTDeviceKit.framework/Versions/A/Resources/symbolicatecrash /path/to/crash-log

(Yes, you probably should use some way to shorten that.)