init

CPM.cmake

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+set(_CPM_Dir "${CMAKE_CURRENT_LIST_DIR}")
+
+include(CMakeParseArguments)
+include(${_CPM_Dir}/DownloadProject.cmake)
+
+function(CPMHasPackage) 
+  
+endfunction()
+
+function(CPMAddPackage)
+  set(options QUIET)
+    
+  set(oneValueArgs
+    NAME
+    GIT_REPOSITORY
+    VERSION
+    GIT_TAG
+    BINARY_DIR
+  )
+
+  set(multiValueArgs "")
+
+  cmake_parse_arguments(CPM_ARGS "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+
+  if (NOT CPM_PACKAGES)
+    set(CPM_PACKAGES "")
+  endif()
+
+  if (${CPM_ARGS_NAME} IN_LIST CPM_PACKAGES)
+    message(STATUS "CPM: package ${CPM_ARGS_NAME} already added")
+    return()
+  endif()
+
+  message(STATUS "CPM: adding package ${CPM_ARGS_NAME}")
+  # update package data
+  LIST(APPEND CPM_PACKAGES ${CPM_ARGS_NAME})
+  # save package data
+  set(CPM_PACKAGES "${CPM_PACKAGES}" CACHE INTERNAL "CPM Packages")
+
+  if (NOT CPM_ARGS_BINARY_DIR)
+    set(CPM_ARGS_BINARY_DIR ${CMAKE_BINARY_DIR}/CPM-projects/${CPM_ARGS_NAME})
+  endif()
+  message("test: ${CPM_ARGS_BINARY_DIR}")
+
+  if (NOT CPM_PROJECT_DIR)
+    set(CPM_PROJECT_DIR "${CPM_ARGS_BINARY_DIR}")
+  endif()
+
+  if (NOT CPM_ARGS_GIT_TAG)
+    set(CPM_ARGS_GIT_TAG v${CPM_ARGS_VERSION})
+  endif()
+
+  SET(CPM_TARGET_CMAKE_FILE "${CPM_PROJECT_DIR}")
+
+  configure_file(
+    "${_CPM_Dir}/CPMProject.CMakeLists.cmake.in"
+    "${CPM_TARGET_CMAKE_FILE}/CMakeLists.txt"
+    @ONLY
+  )
+
+  add_subdirectory(${CPM_TARGET_CMAKE_FILE} ${CPM_ARGS_BINARY_DIR})
+
+endfunction()

CPMProject.CMakeLists.cmake.in

@@ -0,0 +1,28 @@
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+
+if(TARGET @CPM_ARGS_NAME@)
+  return()
+endif()
+
+find_package(@CPM_ARGS_NAME@ @CPM_ARGS_VERSION@ QUIET)
+
+if(${PACKAGE_FOUND})
+  set_target_properties(@CPM_ARGS_NAME@ 
+    PROPERTIES
+      IMPORTED_GLOBAL True
+  )
+else()
+
+  download_project(
+    PROJ LHC
+    GIT_REPOSITORY @CPM_ARGS_GIT_REPOSITORY@
+    GIT_TAG @CPM_ARGS_GIT_TAG@
+    UPDATE_DISCONNECTED 1
+    GIT_SHALLOW 1
+    PREFIX @CPM_ARGS_BINARY_DIR@/dl
+    QUIET
+  )
+
+message("test:   add_subdirectory(${@CPM_ARGS_NAME@_SOURCE_DIR} ${@CPM_ARGS_NAME@_BINARY_DIR})")
+  add_subdirectory(${@CPM_ARGS_NAME@_SOURCE_DIR} ${@CPM_ARGS_NAME@_BINARY_DIR})
+endif()

DownloadProject.CMakeLists.cmake.in

@@ -0,0 +1,17 @@
+# Distributed under the OSI-approved MIT License.  See accompanying
+# file LICENSE or https://github.com/Crascit/DownloadProject for details.
+
+cmake_minimum_required(VERSION 2.8.2)
+
+project(${DL_ARGS_PROJ}-download NONE)
+
+include(ExternalProject)
+ExternalProject_Add(${DL_ARGS_PROJ}-download
+                    ${DL_ARGS_UNPARSED_ARGUMENTS}
+                    SOURCE_DIR          "${DL_ARGS_SOURCE_DIR}"
+                    BINARY_DIR          "${DL_ARGS_BINARY_DIR}"
+                    CONFIGURE_COMMAND   ""
+                    BUILD_COMMAND       ""
+                    INSTALL_COMMAND     ""
+                    TEST_COMMAND        ""
+)

DownloadProject.cmake

@@ -0,0 +1,182 @@
+# Distributed under the OSI-approved MIT License.  See accompanying
+# file LICENSE or https://github.com/Crascit/DownloadProject for details.
+#
+# MODULE:   DownloadProject
+#
+# PROVIDES:
+#   download_project( PROJ projectName
+#                    [PREFIX prefixDir]
+#                    [DOWNLOAD_DIR downloadDir]
+#                    [SOURCE_DIR srcDir]
+#                    [BINARY_DIR binDir]
+#                    [QUIET]
+#                    ...
+#   )
+#
+#       Provides the ability to download and unpack a tarball, zip file, git repository,
+#       etc. at configure time (i.e. when the cmake command is run). How the downloaded
+#       and unpacked contents are used is up to the caller, but the motivating case is
+#       to download source code which can then be included directly in the build with
+#       add_subdirectory() after the call to download_project(). Source and build
+#       directories are set up with this in mind.
+#
+#       The PROJ argument is required. The projectName value will be used to construct
+#       the following variables upon exit (obviously replace projectName with its actual
+#       value):
+#
+#           projectName_SOURCE_DIR
+#           projectName_BINARY_DIR
+#
+#       The SOURCE_DIR and BINARY_DIR arguments are optional and would not typically
+#       need to be provided. They can be specified if you want the downloaded source
+#       and build directories to be located in a specific place. The contents of
+#       projectName_SOURCE_DIR and projectName_BINARY_DIR will be populated with the
+#       locations used whether you provide SOURCE_DIR/BINARY_DIR or not.
+#
+#       The DOWNLOAD_DIR argument does not normally need to be set. It controls the
+#       location of the temporary CMake build used to perform the download.
+#
+#       The PREFIX argument can be provided to change the base location of the default
+#       values of DOWNLOAD_DIR, SOURCE_DIR and BINARY_DIR. If all of those three arguments
+#       are provided, then PREFIX will have no effect. The default value for PREFIX is
+#       CMAKE_BINARY_DIR.
+#
+#       The QUIET option can be given if you do not want to show the output associated
+#       with downloading the specified project.
+#
+#       In addition to the above, any other options are passed through unmodified to
+#       ExternalProject_Add() to perform the actual download, patch and update steps.
+#       The following ExternalProject_Add() options are explicitly prohibited (they
+#       are reserved for use by the download_project() command):
+#
+#           CONFIGURE_COMMAND
+#           BUILD_COMMAND
+#           INSTALL_COMMAND
+#           TEST_COMMAND
+#
+#       Only those ExternalProject_Add() arguments which relate to downloading, patching
+#       and updating of the project sources are intended to be used. Also note that at
+#       least one set of download-related arguments are required.
+#
+#       If using CMake 3.2 or later, the UPDATE_DISCONNECTED option can be used to
+#       prevent a check at the remote end for changes every time CMake is run
+#       after the first successful download. See the documentation of the ExternalProject
+#       module for more information. It is likely you will want to use this option if it
+#       is available to you. Note, however, that the ExternalProject implementation contains
+#       bugs which result in incorrect handling of the UPDATE_DISCONNECTED option when
+#       using the URL download method or when specifying a SOURCE_DIR with no download
+#       method. Fixes for these have been created, the last of which is scheduled for
+#       inclusion in CMake 3.8.0. Details can be found here:
+#
+#           https://gitlab.kitware.com/cmake/cmake/commit/bdca68388bd57f8302d3c1d83d691034b7ffa70c
+#           https://gitlab.kitware.com/cmake/cmake/issues/16428
+#
+#       If you experience build errors related to the update step, consider avoiding
+#       the use of UPDATE_DISCONNECTED.
+#
+# EXAMPLE USAGE:
+#
+#   include(DownloadProject)
+#   download_project(PROJ                googletest
+#                    GIT_REPOSITORY      https://github.com/google/googletest.git
+#                    GIT_TAG             master
+#                    UPDATE_DISCONNECTED 1
+#                    QUIET
+#   )
+#
+#   add_subdirectory(${googletest_SOURCE_DIR} ${googletest_BINARY_DIR})
+#
+#========================================================================================
+
+
+set(_DownloadProjectDir "${CMAKE_CURRENT_LIST_DIR}")
+
+include(CMakeParseArguments)
+
+function(download_project)
+
+    set(options QUIET)
+    set(oneValueArgs
+        PROJ
+        PREFIX
+        DOWNLOAD_DIR
+        SOURCE_DIR
+        BINARY_DIR
+        # Prevent the following from being passed through
+        CONFIGURE_COMMAND
+        BUILD_COMMAND
+        INSTALL_COMMAND
+        TEST_COMMAND
+    )
+    set(multiValueArgs "")
+
+    cmake_parse_arguments(DL_ARGS "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+
+    # Hide output if requested
+    if (DL_ARGS_QUIET)
+        set(OUTPUT_QUIET "OUTPUT_QUIET")
+    else()
+        unset(OUTPUT_QUIET)
+        message(STATUS "Downloading/updating ${DL_ARGS_PROJ}")
+    endif()
+
+    # Set up where we will put our temporary CMakeLists.txt file and also
+    # the base point below which the default source and binary dirs will be.
+    # The prefix must always be an absolute path.
+    if (NOT DL_ARGS_PREFIX)
+        set(DL_ARGS_PREFIX "${CMAKE_BINARY_DIR}")
+    else()
+        get_filename_component(DL_ARGS_PREFIX "${DL_ARGS_PREFIX}" ABSOLUTE
+                               BASE_DIR "${CMAKE_CURRENT_BINARY_DIR}")
+    endif()
+    if (NOT DL_ARGS_DOWNLOAD_DIR)
+        set(DL_ARGS_DOWNLOAD_DIR "${DL_ARGS_PREFIX}/${DL_ARGS_PROJ}-download")
+    endif()
+
+    # Ensure the caller can know where to find the source and build directories
+    if (NOT DL_ARGS_SOURCE_DIR)
+        set(DL_ARGS_SOURCE_DIR "${DL_ARGS_PREFIX}/${DL_ARGS_PROJ}-src")
+    endif()
+    if (NOT DL_ARGS_BINARY_DIR)
+        set(DL_ARGS_BINARY_DIR "${DL_ARGS_PREFIX}/${DL_ARGS_PROJ}-build")
+    endif()
+    set(${DL_ARGS_PROJ}_SOURCE_DIR "${DL_ARGS_SOURCE_DIR}" PARENT_SCOPE)
+    set(${DL_ARGS_PROJ}_BINARY_DIR "${DL_ARGS_BINARY_DIR}" PARENT_SCOPE)
+
+    # The way that CLion manages multiple configurations, it causes a copy of
+    # the CMakeCache.txt to be copied across due to it not expecting there to
+    # be a project within a project.  This causes the hard-coded paths in the
+    # cache to be copied and builds to fail.  To mitigate this, we simply
+    # remove the cache if it exists before we configure the new project.  It
+    # is safe to do so because it will be re-generated.  Since this is only
+    # executed at the configure step, it should not cause additional builds or
+    # downloads.
+    file(REMOVE "${DL_ARGS_DOWNLOAD_DIR}/CMakeCache.txt")
+
+    # Create and build a separate CMake project to carry out the download.
+    # If we've already previously done these steps, they will not cause
+    # anything to be updated, so extra rebuilds of the project won't occur.
+    # Make sure to pass through CMAKE_MAKE_PROGRAM in case the main project
+    # has this set to something not findable on the PATH.
+    configure_file("${_DownloadProjectDir}/DownloadProject.CMakeLists.cmake.in"
+                   "${DL_ARGS_DOWNLOAD_DIR}/CMakeLists.txt")
+    execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}"
+                        -D "CMAKE_MAKE_PROGRAM:FILE=${CMAKE_MAKE_PROGRAM}"
+                        .
+                    RESULT_VARIABLE result
+                    ${OUTPUT_QUIET}
+                    WORKING_DIRECTORY "${DL_ARGS_DOWNLOAD_DIR}"
+    )
+    if(result)
+        message(FATAL_ERROR "CMake step for ${DL_ARGS_PROJ} failed: ${result}")
+    endif()
+    execute_process(COMMAND ${CMAKE_COMMAND} --build .
+                    RESULT_VARIABLE result
+                    ${OUTPUT_QUIET}
+                    WORKING_DIRECTORY "${DL_ARGS_DOWNLOAD_DIR}"
+    )
+    if(result)
+        message(FATAL_ERROR "Build step for ${DL_ARGS_PROJ} failed: ${result}")
+    endif()
+
+endfunction()

test/CMakeLists.txt

@@ -0,0 +1,31 @@
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+
+project(CPMTest)
+
+include(${CMAKE_CURRENT_SOURCE_DIR}/../CPM.cmake)
+
+CPMAddPackage(
+  NAME LHC
+  GIT_REPOSITORY https://github.com/TheLartians/LHC.git
+  VERSION 0.3
+)
+
+CPMAddPackage(
+  NAME LarsEvent
+  GIT_REPOSITORY https://github.com/TheLartians/Event.git
+  VERSION 1.0
+)
+
+# Add project that depends on previous project
+CPMAddPackage(
+  NAME LarsParser
+  GIT_REPOSITORY https://github.com/TheLartians/Parser.git
+  VERSION 1.2
+)
+
+# add project twice
+CPMAddPackage(
+  NAME LHC
+  GIT_REPOSITORY https://github.com/TheLartians/LHC.git
+  VERSION 0.3
+)