Created attachment 347220 [details]
First build failure

Contrary to make, ninja-build is heavily focused on parallel building as much as possible. It appears our dependency tree as we have configured it in our CMakeList.txt files is sometimes not explicit enough, causing ninja-build to sometimes build objects before its dependencies are built.

I suspect this is a side-effect of using gnc-module loading in scm files. We never really paid much attention to this because gnc-module is intended to be used when gnucash is run. In that situation all dependencies are available (barring a bad install).

However with the move to guile2 we are precompiling our scm files (to ensure a clean scm compile cache). Compiling scm files will also activate gnc-module calls, this time during the build cycle when not all modules may be available yet.

On a fast machine (on ssd) when doing a partial rebuild, this will sometimes cause the build to fail. I have never seen it yet on a fresh build, though in theory that's still possible.

Usually the problem solves itself simply be restarting the build (perhaps more than once).