Sounds like it is time for some sort of autobuild. Like every 15-20 mins after a checkin build everything (doesnt matter if it fails that is fine). If autobuild is failing dont release... Hudson/Jenkins works pretty good... You can even use it to build the final release, diff, and even the different flavors such as 32 bit and 64. This sort of error is exactly what things like Hudson/Jenkins help you find before you release.
Think you can even get plugins that let you promote current checkins to 'release' versions. You can then have those things auto populate a web page.