[Bug 266279] devel/cmake: cmake fails to find *.cmake files in /usr/local/lib/cmake

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266279

Adriaan de Groot <adridg at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |Works As Intended
             Status|New                         |Closed
                 CC|                            |adridg at freebsd.org

--- Comment #3 from Adriaan de Groot <adridg at freebsd.org> ---
First off, OpenCASCADE (cad/opencascade) is installing its CMake Config files
to the wrong place. Installing into ${LOCALBASE}/share/OpenCASCADE/ would make
it "just work". Like rttr, ECM, and Eigen3.

The right flag for debugging problems with finding packages using CMake is
`--debug-find`, not `--trace`. Trace tells you what is executed, but it can't
execute what it can't find. On the other hand, debug-find tells you where it
looked, and why.

There's a difference between *modules* (e.g. FindOpenCASCADE.cmake) and
*config* (e.g. OpenCASCADEConfig.cmake). Different paths are used for
searching. The error message you posted tells you that find *modules* are
looked-for in the MODULE path, and that *configs* are looked-for in the PREFIX.
It's not super-duper clear, not there and not in the help for `find_package()`,
but if you follow the instructions:


$ rm CMakeCache.txt ; cmake --debug-find . -DCMAKE_PREFIX_PATH=/usr/local/lib
<snip lots of output>

  find_package considered the following locations for OpenCASCADE's Config
  module:

    /tmp/pr-266279/CMakeFiles/pkgRedirects/OpenCASCADEConfig.cmake
    /tmp/pr-266279/CMakeFiles/pkgRedirects/opencascade-config.cmake
    /usr/local/lib/OpenCASCADEConfig.cmake
    /usr/local/lib/opencascade-config.cmake
    /usr/local/lib/cmake/OpenCASCADEConfig.cmake

  The file was found at

    /usr/local/lib/cmake/OpenCASCADEConfig.cmake

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