title: Yocto populate SDK - Receipe inherit from cmake
body: <p><br>
  I use cmake to build my source code. It depend on a package named "spdlog". <br>
  I want to generate the sdk using yocto. SDK is correctly generated using populate_sdk but spdlog config cmake file is not shipped in SDK.
  My receipe :<br></p>
  
  <pre><code>SUMMARY = "Spdlog"
  DESCRIPTION = "Fast C++ logging library"
  AUTHOR = "author name"
  LICENSE = "CLOSED"
  SECTION = "libs"
  
  SRC_URI = "git://git@github.com/gabime/spdlog.git;branch=master;protocol=ssh"
  SRCREV = "7088644d3f69f18b51671eb52dd49028fd858add"
  
  PR = "r0"
  
  PVBASE := "${PV}"
  
  FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}-${PVBASE}:"
  
  PV = "${PVBASE}.${SRCPV}"
  
  S = "${WORKDIR}/git"
  
  inherit cmake pkgconfig
  
  FILES_${PN} += "/usr/lib/cmake/spdlog/spdlogConfig.cmake \
                  /usr/lib/cmake/spdlog/spdlogConfigVersion.cmake \
                  "
  </code></pre>
  
  <p>But, we I install my SDK and try to use it to compil my code, it failed with this error :</p>
  
  <pre><code>Make Error at CMakeLists.txt:89 (find_package):
    Could not find a package configuration file provided by "spdlog" with any
    of the following names:
  
      spdlogConfig.cmake
      spdlogConfigVersion.cmake
  </code></pre>
  
  <p>When I check my build tmp/work/spdlog folder, I can see the files exported :</p>
  
  <pre><code>./image/usr/lib/cmake/spdlog/spdlogConfig.cmake
  ./sysroot-destdir/usr/lib/cmake/spdlog/spdlogConfig.cmake
  ./packages-split/spdlog/usr/lib/cmake/spdlog/spdlogConfig.cmake
  ./build/CMakeFiles/Export/lib/cmake/spdlog/spdlogConfig.cmake
  ./build/spdlogConfig.cmake
  ./package/usr/lib/cmake/spdlog/spdlogConfig.cmake
  ./recipe-sysroot-native/usr/share/cmake-3.8/Modules/FindPkgConfig.cmake
  ./recipe-sysroot-native/usr/share/cmake-3.8/Modules/UsePkgConfig.cmake
  </code></pre>
  
  <p>Do you have any idea about this issue ?</p>