While the subject of this mail is not quite true yet, I'm happy to announce progress on this project that Monty and I have been discussing for some time. Basically, compiler warnings are very useful to catch a number of bugs in our sources. This has been proven time and time again. However, to do this effectively, we need to keep a state where there are no compiler warnings in the main tree, so that we can detect any new warnings introduced by patches and fix any problems accordingly. With my latest push this morning, the Buildbot compiles on builders hardy-amd64-valgrind and work-amd64-valgrind are now completely free of warnings. This means any new patches must be also clean from warnings on these hosts. Any newly introduced warnings should be fixed ASAP. There are still some compiler warnings left on the other hosts, which would be really good to also eliminate. Any help in this direction would be greatly appreciated. There are a few compiler warnings that could not be fixed meaningfully in the source for various reasons. These warnings are instead suppressed from Buildbot using the file support-files/compiler_warnings.supp. Over time we should strive to remove things from this file. However, we should not make stupid changes to the code just to make a silly compiler happy. I also added to the tree this script: support-files/ccfilter This can be used locally by developers to apply support-files/compiler_warnings.supp to the output of a local build, just like Buildbot suppresses compiler warnings from this file. This is useful to check that new patches are warning-free before pushing. There are some comments at the start of the script describing usage. But basically, run ./configure with CC="ccfilter gcc" CXX="ccfilter gcc" Then the suppressed compiler warnings will be removed from the compiler output. And setting the FAILONWARNING environment variable can be used to cause a build failure on non-suppressed warning (similar to -Wall, but heeding support-files/compiler_warnings.supp). - Kristian.