← Back to team overview

kicad-developers team mailing list archive

Bug 1833851 - Massively Parallel Builds


Hi Devs-

I'm stuck at a decision on this bug and would like some opinions from others.

The background is the GNU make is not intelligent about parallel builds and doesn't merge generated targets. So we need to serialize the dependencies but this breaks everytime we include the lexer header file in a different object or use the generated DSO for more than one target. Eventually, we have sufficient parallel processes that the header gets generated twice. If this happens at the same time, the build breaks.

The two (ok, three) options I see are as follows:

1) Build the header file into a target directory instead of the source directory. Then everyone gets to build their own with no conflict. We end up building lots and lots of header/lexer files. Developers won't see the files in the usual location.

2) We build the files like bitmap pngs. That is, they are re-built by a different CMAKE flag and their header/cpp files are checked into the repository. When we add tags to the parser, we need to explicitly regenerate the lexer files and check them in.

3) External scripting. We could utilize an external python script to force one build at a time using lockfiles. This would add python as a build dependency. We could alternatively use flock in a shell script but I'm not sure that exists on all platforms.

Does anyone have preference for which option we take?


Follow ups