external-project

I have following CMakeLists.txt file: cmake_minimum_required (VERSION 3.2 FATAL_ERROR) project (utils VERSION 1.0.0 LANGUAGES CXX) ExternalProject_Add(json-c GIT_REPOSITORY "https://github.com/json-c/json-c.git" UPDATE_COMMAND git pull "https://github.com/json-c/json-c.git" CONFIGURE_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/SDL_image/./configure --prefix=${SDL_INSTALL_DIR} SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/json-c INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR} ) I want to add json-c library to my project, but when I run cmake I'm getting error: Unknown CMake command "ExternalProject_Add". My CMake

I would like to build a third-party project that already has CMake as part of my project's CMake strips. ExternalProject_Add is for this purpose, but I have found it can only be made to work with a specific generator, and I wanted to work on many platforms easily. For example here is my external project add script for zlib, which has its own CMakeLists.txt: set(USE_PROJECT_CMAKE_MODULE_PATH "-DCMAKE_MODULE_PATH=${MAKE_MODULE_PATH}") ExternalProject_Add(ZLIB SOURCE_DIR ${CMAKE_SOURCE_DIR}/external/zlib DOWNLOAD_COMMAND "" UPDATE_COMMAND "" CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR> -DCMAKE

Is there are proper way to find a library (via FindPackage() ) which was built with ExternalProject_Add() ? The problem is that CMake cannot find the library at CMake-time because the external library gets build at compile time. I know that it is possible to combine these two CMake function when building the library and the project in a superbuild but I want to use it in a normal CMake project. In fact I would like to build VTK 6 with ExternalProject_Add and find it with FindPackage all inside my CMake project. there is a way to do this. but it´s kind of hackish. you basically add a custom

I have a Project A that exports a static library as a target: install(TARGETS alib DESTINATION lib EXPORT project_a-targets) install(EXPORT project_a-targets DESTINATION lib/alib) Now I want to use Project A as an external project from Project B and include its built targets: ExternalProject_Add(project_a URL ...project_a.tar.gz PREFIX ${CMAKE_CURRENT_BINARY_DIR}/project_a CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> ) include(${CMAKE_CURRENT_BINARY_DIR}/lib/project_a/project_a-targets.cmake) The problem is that the include file does not exist yet when CMakeLists of Project B is run.