Merge pull request #1 from TheLartians/external-packaging

add PackageProject.cmake as a CPM dependency

CMakeLists.txt

@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
 
 # ---- Project ----
 
+# Note: update this to your new project's name and version
 project(Greeter 
   VERSION 1.0
   LANGUAGES CXX
@@ -20,23 +21,21 @@ endif()
 FILE(GLOB_RECURSE headers "${CMAKE_CURRENT_SOURCE_DIR}/include/*.h")
 FILE(GLOB_RECURSE sources "${CMAKE_CURRENT_SOURCE_DIR}/source/*.cpp")
 
-# ---- Add dependencies via CPM (if required) ----
+# ---- Add dependencies via CPM ----
 # see https://github.com/TheLartians/CPM.cmake for more info
 
-# include(cmake/CPM.cmake)
+include(cmake/CPM.cmake)
 
-# CPMAddPackage(
-#   NAME cxxopts
-#   GITHUB_REPOSITORY jarro2783/cxxopts
-#   VERSION 2.2.0
-#   OPTIONS
-#     "CXXOPTS_BUILD_EXAMPLES Off"
-#     "CXXOPTS_BUILD_TESTS Off"
-# )
+# PackageProject.cmake will be used to make our target installable
+CPMAddPackage(
+  NAME PackageProject.cmake
+  GITHUB_REPOSITORY TheLartians/PackageProject.cmake
+  VERSION 1.0
+)
 
 # ---- Create library ----
 
-# Notes:
+# Note:
 # for single header libraries use `add_library(Greeter INTERFACE)` instead 
 # To create an executable use `add_executable(Greeter ${headers} ${sources})`
 add_library(Greeter ${headers} ${sources})
@@ -46,9 +45,9 @@ add_library(Greeter ${headers} ${sources})
 set_target_properties(Greeter PROPERTIES CXX_STANDARD 17)
 
 # Link dependencies (if required)
-# target_link_libraries(Greeter cxxopts)
+# target_link_libraries(Greeter PUBLIC cxxopts)
 
-# Node: change PUBLIC to INTERFACE for single header libraries  
+# Note: change PUBLIC to INTERFACE for single header libraries  
 target_include_directories(Greeter
   PUBLIC
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
@@ -56,6 +55,12 @@ target_include_directories(Greeter
 )
 
 # ---- Create an installable target ----
-# this allows users install and find the library via `find_package(Greeter)`.
+# this allows users to install and find the library via `find_package()`.
 
-include(cmake/packaging.cmake)
+packageProject(
+  NAME ${PROJECT_NAME}
+  VERSION ${PROJECT_VERSION}
+  BINARY_DIR ${PROJECT_BINARY_DIR}
+  INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include
+  INCLUDE_DESTINATION include/${PROJECT_NAME}-${PROJECT_VERSION}
+)

README.md

@@ -21,7 +21,7 @@ This template is a collection from learnings of previous projects and should all
 - Code coverage via [codecov](https://codecov.io)
 - Code formatting enforced by [clang-format](https://clang.llvm.org/docs/ClangFormat.html) via [Format.cmake](https://github.com/TheLartians/Format.cmake)
 - Reproducible dependency management via [CPM.cmake](https://github.com/TheLartians/CPM.cmake)
-- Installable target with versioning information
+- Installable target with versioning information via [PackageProject.cmake](https://github.com/TheLartians/PackageProject.cmake)
 
 ## Usage
 
@@ -80,9 +80,16 @@ See [Format.cmake](https://github.com/TheLartians/Format.cmake) for more options
     This approach should be compatible with any common C++ package manager without any user intervention, however at the cost of reproducible builds.
     For more info, see the [CPM.cmake documentation](https://github.com/TheLartians/CPM.cmake).
 
-  - How do I package my library / executable into an installer?
+  - Can I configure and build my project offline?
 
-    As there are a lot of possible options and configurations, this is not in the scope of this template. See the [CPack documentation](https://cmake.org/cmake/help/latest/module/CPack.html) for more info.
+    Using CPM, all missing dependencies are downloaded at configure time.
+    To avoid redundant downloads, it's recommended to set a CPM cache directory, e.g.: `export CPM_SOURCE_CACHE=$HOME/.cache/CPM`.
+    This will also allow offline configurations if all dependencies are present.
+    No internet connection is required for building.
+
+  - Can I use CPack to create a package installer for my project?
+
+    As there are a lot of possible options and configurations, this is not (yet) in the scope of this template. See the [CPack documentation](https://cmake.org/cmake/help/latest/module/CPack.html) for more information on setting up CPack installers.
 
 ## Coming soon
 

cmake/Config.cmake.in

@@ -1,5 +0,0 @@
-@PACKAGE_INIT@
-
-include(CMakeFindDependencyMacro)
-include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
-check_required_components("@PROJECT_NAME@")

cmake/packaging.cmake

@@ -1,43 +0,0 @@
-include(CMakePackageConfigHelpers)
-
-write_basic_package_version_file(
-  "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
-  VERSION ${PROJECT_VERSION}
-  COMPATIBILITY AnyNewerVersion
-)
-
-install(
-  TARGETS ${PROJECT_NAME}
-  EXPORT ${PROJECT_NAME}Targets
-  LIBRARY DESTINATION lib/${PROJECT_NAME}-${PROJECT_VERSION} COMPONENT Runtime
-  ARCHIVE DESTINATION lib/${PROJECT_NAME}-${PROJECT_VERSION} COMPONENT Development
-  RUNTIME DESTINATION bin/${PROJECT_NAME}-${PROJECT_VERSION} COMPONENT Runtime
-  PUBLIC_HEADER DESTINATION include/${PROJECT_NAME}-${PROJECT_VERSION} COMPONENT Development
-  BUNDLE DESTINATION bin COMPONENT Runtime
-)
-
-include(CMakePackageConfigHelpers)
-
-configure_package_config_file(
-  "${CMAKE_CURRENT_LIST_DIR}/Config.cmake.in"
-  "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
-  INSTALL_DESTINATION lib/cmake/${PROJECT_NAME}-${PROJECT_VERSION}
-)
-
-install(
-  EXPORT ${PROJECT_NAME}Targets
-  DESTINATION lib/cmake/${PROJECT_NAME}-${PROJECT_VERSION}
-)
-
-install(
-  FILES 
-    "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
-    "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
-  DESTINATION 
-    lib/cmake/${PROJECT_NAME}-${PROJECT_VERSION}
-)
-
-install(
-  DIRECTORY ${PROJECT_SOURCE_DIR}/include/
-  DESTINATION include/${PROJECT_NAME}-${PROJECT_VERSION}
-)