[Bug 1653635] Re: cmake unable to report INCLUDE_DIRS and LIBRARIES

[Timo Röhling]

The CMake config exports the `jsoncpp_lib` and `jsoncpp_static` targets,
which will automatically perform all required settings when used with
`target_link_libraries()`. Manually setting the include paths and link
libraries is an anti-pattern.


** Changed in: libjsoncpp (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1653635

Title:
  cmake unable to report INCLUDE_DIRS and LIBRARIES

Status in libjsoncpp package in Ubuntu:
  Invalid

Bug description:
  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 16.04.1 LTS
  Release:	16.04
  Codename:	xenial

  $ dpkg -l|grep libjsoncpp
  ii  libjsoncpp-dev:amd64                       1.7.2-1                                       amd64        library for reading and writing JSON for C++ (devel files)
  ii  libjsoncpp1:amd64                          1.7.2-1                                       amd64        library for reading and writing JSON for C++

  When try to use jsoncpp, the ${jsoncpp_INCLUDE_DIRS} and
  ${jsoncpp_LIBRARIES} fail to report.

  CMakeLists.txt
  ----------------
  cmake_minimum_required(VERSION 2.6.2)
  project(jsoncpp_test)

  find_package(jsoncpp REQUIRED)
  message("FOUND CONFIG: ${jsoncpp_CONFIG}")
  message("INCLUDE DIRS: ${jsoncpp_INCLUDE_DIRS}")
  message("LIBRARIES: ${jsoncpp_LIBRARIES}")

  The actual result is:
  --------------------
  FOUND CONFIG: /usr/lib/x86_64-linux-gnu/cmake/jsoncpp/jsoncppConfig.cmake
  INCLUDE DIRS: 
  LIBRARIES:

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