Wrong CMake config file used

[Former user]

I have mshr compiled from source and when i try to find the library in a CMakeLists.txt file,CMake ends up choosing the wrong config file. In more detail, my folder structure is as follows:

• /opt/fenics/source: all the source
• /opt/fenics/install: install destination

Now, at least two config files are present: /opt/fenics/source/mshr/build/mshr-config.cmake and /opt/fenics/install/lib/CMake/mshr/mshr-config.cmake

In my CMakeLists.txt I do

find_package(mshr REQUIRED
    PATHS /opt/fenics/install/lib/CMake/mshr/)

include(${MSHR_USE_FILE})                                                                                                                                              
message("mshr found!")

message("  config file is " ${mshr_CONFIG})
message("  considered config file is " ${mshr_CONSIDERED_CONFIGS})
message("  libraries dir is " ${MSHR_LIBRARIES_DIRS})
message("  library is " ${MSHR_LIBRARIES})
message("  include dir is " ${MSHR_INCLUDE_DIRS})

which yields the output

mshr found!

  config file is /opt/fenics/source/mshr/build/mshr-config.cmake
  considered config file is /opt/fenics/source/mshr/build/mshr-config.cmake
  libraries dir is /opt/fenics/source/mshr/build/lib
  library is mshr                      
  include dir is /opt/fenics/source/mshr/include

If I delete the file /opt/fenics/source/mshr/build/mshr-config.cmake, then CMake finds the correct configuration file using the PATHS directive, which earlier was ignored. If I now remove the PATHS directive, CMake cannot find the correct configuration file.

Ideally, CMake should be able to find the installed [correct] config file without the PATHS directive.

I am on a standard Debian testing OS.