On Tue, Feb 04, 2020 at 03:27:50PM +0100, Thomas Monjalon wrote: > 04/02/2020 12:48, Bruce Richardson: > > as we discussed offline, I really don't like the necessity of the > > hidden_deps part of this, so I've tried coming up with some other > > solutions. > > Thanks for looking closely at these patches. > > > For example, in my testing I get the same result with the > > following diff instead of the second two patches (just showing for mlx5 - > > changes for mlx4 are identical): > [...] > > - # Build without adding shared libs to > > Requires.private > > - hidden_deps += > > lib.partial_dependency(compile_args:true) > [...] > > + ibv_cflags = run_command(find_program('pkg-config'), '--cflags', > > 'libibverbs').stdout() > [...] > > By doing things this way - assuming it works in your tests too - we avoid > > any need to change anything in the common drivers code. > > Yes, you hide the dependency by getting cflags directly with pkg-config. > I wanted to avoid such solution because I was trying to use as much > as possible the meson infrastructure. > > I think your solution relying on one more call to pkg-config is acceptable. > I will test it and will review whether we get all corner cases. >
Thanks. It's not really ideal, but this is likely always going to be a bit flakey since we can't use distro-supplied .a files, and your scripting is needed to prevent even accidentally taking a non-custom-build rdma-core file. Furthermore, I see that while meson tracks PKG_CONFIG_PATH value itself for finding things, this does not get tracked between runs for shell calls. This can catch one out, for example: PKG_CONFIG_PATH=/path/to/pc/files meson build will work correctly for everything. However, if one does a reconfigure subsequently doing e.g. ninja reconfigure, meson will correctly pick up the .pc files, but the ibverbs-static script, or any run_command calls to pkg-config won't as it's not actually in the environment :-( > In the meantime I discovered we are overlinking with meson > when using the dlopen linking option. > I will try to fix it as well with the same method. > Right. Overlinking is probably less serious an issue though. Does it cause any real-world problems? /Bruce