taylanbayi...@gmail.com (Taylan Ulrich "Bayırlı/Kammer") skribis:
> l...@gnu.org (Ludovic Courtès) writes: > >> Do you have an example of a package that uses Requires.private? > > libxrandr is a good test case. Indeed I patched it a few days ago > because some libraries in its Requires.private weren't propagated, which > fixed my issue. > >>> However, pkg-config isn't aware of compile-time/run-time dependency >>> differences; it's considered an error if a Requires.private of libfoo >>> isn't found, >> >> Really, even without --static? >> >>> because as far as pkg-config is concerned, it means libfoo is >>> dysfunctional. So we *do* need to propagate Requires.private, for the >>> sake of pkg-config. (The problem mainly manifests in the form of >>> ./configure scripts claiming libfoo isn't found when it's only libbar >>> that's missing, because in that case pkg-config returns an error to >>> the ./configure script when inquired about libfoo.) >> >> Do you have an example of that? > > I hit the issue with libxrandr while packaging mpv. It has x11 under > its Requires.private, and: [...] > So while e.g. --libs actually works, --exists reports failure, and > --print-errors explains why. > > One could say this is partially a bug, because if libxrandr statically > linked against libx11, then libx11 needn't exist at build nor run time. OK. Thanks for digging. > It might be nice to have build-only propagated inputs. On the other > hand, someone installing libxrandr in their profile will expect > pkg-config on libxrandr to work without errors. More generally, they > will expect any build operation to work; i.e. a user might want to use > Guix-installed libraries for Guix-external development, and build-only > propagated inputs would mean annoying such users because they now have > to install them manually. Unless we provide a special "install for > development" operation that is. But the complexity grows. :-) Heh. Another option would be to have per-output propagated inputs. That is, if a package has “out” and “lib” outputs, you’d want the propagated inputs to apply only to “lib” since this is where the .pc is. (This has been in ‘TODO’ for a couple of years.) Thoughts? Thanks, Ludo’.
