[CMake] Create relocatable package with proper autogenerated config cmake

[drgutek@o2.pl]

Hi,  I have created cmake target, say  A , and want to install it and create a Config file, so that the installed package could be relocatable. My code is:   install(EXPORT ${PROJECT_NAME}Targets
    FILE ${PROJECT_NAME}Targets.cmake
    NAMESPACE ${PROJECT_NAME}::
    DESTINATION ??? )  Here, I am having a problem with the proper destination. I want the Config file to be installed where  ${CMAKE_INSTALL_PREFIX}  points to. But when I put  ${CMAKE_INSTALL_PREFIX}  at  ??? , my resulting  ATargets.cmake  file contains the line:   set(_IMPORT_PREFIX "C:/Libraries/...")  which is the actual value of  ${CMAKE_INSTALL_PREFIX} . This  _IMPORT_PREFIX  is later prepended to the parameters of  set_target_properties()  command inside the auto-generated  ATargets.cmake , resulting in hard coded paths, valid only on the installation system.  I tried to use some generator expressions like  <$IMPORT_PREFIX>  in place of  ??? , but this gave me an error at cmake generation. I also tried to omit  DESTINATION  which in my opinion should place the file in the location relative to  ${CMAKE_INSTALL_PREFIX} , but cmake complained about it too.  I
 got a suggesion on StackOverflow to use . (a dot) as my DESTINATION. 
This worked partially, in the way that I no longer have absolute 
_IMPORT_PREFIX. Unfortunately, the produced paths are still invalid: The
 generated ATargets.cmake contains:   get_filename_component(_IMPORT "${CMAKE_CURRENT_LIST_FILE}" PATH)  get_filename_component(_IMPORT "${_IMPORT_PREFIX}" PATH)   and the second line above is not necessary, it trims the path too much by one folder.   Do you have any ideas how to solve it?   Best regards,  Piotr
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