Hi, right now cpluspluscheck doesn't work with vpath builds. That's pretty annoying, because it does require cloning the git tree into a separate directory + doing configure there just to run cpluspluscheck.
Attached is a small patch allowing cpluspluscheck to run from different directories. I needs the src and build directories for that, unsurprisingly. As that makes it more complicated to invoke, I added a makefile target (in the top level) for it. Seems we could round the edges a good bit further than what's done in the attached (argument checking, for example). But I think this would already be an improvement? Greetings, Andres Freund
