CMake error on first build

[dave992]

When building the noether package for the first time (or after cleaning the workspace) it fails with the following errors as mentioned in #98 (comment):

Errors     << noether_filtering:cmake /catkin_ws/logs/noether_filtering/build.cmake.000.log                                                                                              
CMake Error:
  Error evaluating generator expression:

    $<COMPILE_LANGUAGE:CXX>

  $<COMPILE_LANGUAGE:...> may only be used to specify include directories,
  compile definitions, compile options, and to evaluate components of the
  file(GENERATE) command.

...

PCL NURBS FOUND
Building mesh plugins
cd /catkin_ws/build/noether_filtering; catkin build --get-env noether_filtering | catkin env -si  /usr/bin/cmake /catkin_ws/src/noether/noether_filtering --no-warn-unused-cli -DCMAKE_INSTALL_PREFIX=/catkin_ws/devel; cd -

Running catkin build again then allows noether to build successfully. In #98 (comment) it is advised to try the fix implemented in this PR, which solves the first build issue.

[Levi-Armstrong]

See my comment in the issue on how to better address this issue.

[dave992]

Fair enough, I just assumed here that this check may be redundant as the instructions on how to install PCL are quite clear and prominently shown in the readme.

I do not know what actually happens when NURBS is not built correctly, so this may be a bad solution indeed in case the resulting errors are not easily interpretable.

I'll close this then.