c++ - CMake: Using the headers installed by an External Project -

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i have read documentation on using external projects kitware here , attempting follow process use image-processing library leptonica external dependency. cross-compiling using different toolchains, not want install leptonica globally, rather have libraries , headers installed within build directory can deleted , reinstalled compilation toolchains change.

in other words, make cmakeprojecta dependent on installed headers , libraries of externalprojectb. here have cmakelists.txt file.

cmake_minimum_required(version 3.2) project(cmakeprojecta) set(source_files main.cpp) set(cmake_cxx_flags "${cmake_cxx_flags} -std=c++11")  include(externalproject) externalproject_add(     leptonica-1.72     prefix leptonica     url http://www.leptonica.com/source/leptonica-1.72.tar.gz     url_md5 7581db29f8442197ce68e766c6047c4b     configure_command <source_dir>/configure --prefix=<install_dir> ) externalproject_get_property(     leptonica-1.72     install_dir ) set(leptonica_include_dir ${install_dir} cache string "location of leptonica header files")  include_directories(${leptonica_include_dir})  add_executable(my_executable ${source_files}) add_dependencies(my_executable leptonica-1.72) target_link_libraries(my_executable leptonica-1.72)

when @ cached value of leptonica_include_dir, value 

/users/me/library/caches/clion10/cmake/generated/509e0c9e/509e0c9e/__default__/install`.

yet cmakeprojecta being built to:

/users/me/library/caches/clion10/cmake/generated/509e0c9e/509e0c9e/debug

as result, believe default in former's path not allow header files of leptonica found main project. how make project aware of different build variants (debug , release) of project, cmakeprojecta can use headers , libraries provided leptonica?

i did further research , decided follow example of openchemistry cmake-based project, since had similar requirements in including multiple external projects.


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