On Thu, 2018-05-31 at 10:12 -0400, Brad King wrote: > On 05/25/2018 07:52 PM, Paul Fultz II wrote: > > What else is missing? > > The `.pc` format focuses on flat command-line strings that drop much > of the information used to generate them. For example, if library > A depends on library B then the `.pc` file will record the link flags > > -L/path/to/A/lib -L/path/to/B/lib -lA -lB
No, it would record it as: Requires: B It would only record it as `-L/path/to/A/lib -L/path/to/B/lib -lA -lB` if B didnt support pkg-config. This same problem exists for cmake if the user doesn't use a separate target for library B. > > > Some CMake "find modules" try to extract information from `.pc` files > by running pkg-config to get command lines. They inevitably have to > parse the command lines and manually reconstruct things that could have > been put in the packaging files in a structured way in the first place. This is because cmake lacks native support for pkg-config. It only uses the pkg-config CLI, which works fine for makefiles. Instead cmake needs to make a target for each `.pc` found. This could be possible if it used libpkgconf instead. Even more so, we could support a `cmake_target` variable so .pc files could specify the cmake target name. > > > extending pkg-config seems like it would help adoption rather then > > creating a completely new format. > > It would be nice if that would work. However, most `.pc` files already > leave out much of the deeper information CMake likes to have. Even > if we found a good way to represent that information in `.pc` files > projects would still need big updates to produce that information. Projects would need to be updated for cps as well, but it seems a few tweaks to pkg-config is more likely to be accepted than adding a new file format. Paul -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: https://cmake.org/mailman/listinfo/cmake
