Merge pull request #33 from rest-for-physics/lobis-patch-cmake_find_package

Support Building restG4 as a standalone package via CMake

Author: lobis

.gitlab-ci.yml

@@ -3,6 +3,7 @@ image: ghcr.io/lobis/root-geant4-garfield:cpp17_ROOT-v6-26-00_Geant4-v10.4.3_Gar
 
 stages:
   - build
+  - build-standalone
   - loadRESTLibs
   - examples
 
@@ -41,14 +42,27 @@ build:
     - mkdir build
     - cd build
     - cmake ../ -DREST_WELCOME=ON -DREST_G4=ON -DCMAKE_INSTALL_PREFIX=${CI_PROJECT_DIR}/install
-    - make install -j2
+    - make -j2 install
   artifacts:
     paths:
       - ${CI_PROJECT_DIR}/install
       - ${CI_PROJECT_DIR}/framework
       - ${CI_PROJECT_DIR}/framework/build
     expire_in: 1 day
 
+build-standalone:
+  type: build-standalone
+  script:
+    - echo "**${CI_PROJECT_DIR}**"
+    - cd ${CI_PROJECT_DIR}/
+    - if [ -d build ]; then rm -rf build; fi
+    - mkdir build
+    - cd build
+    - source ${CI_PROJECT_DIR}/install/thisREST.sh
+    - cmake ../ -DCMAKE_INSTALL_PREFIX=${CI_PROJECT_DIR}/install
+    - make -j2 install
+    - ${CI_PROJECT_DIR}/install/bin/restG4 --help
+
 ### We make sure the build and install directories are different
 ##build_root_6.25_Geant4_10.7.1:
 ##  image: lobis/root-geant4-garfieldpp:cxx14_ROOTv6-25-01_Geant4v10.7.1

CMakeLists.txt

@@ -4,6 +4,16 @@ project(restG4)
 message("===============  ${PROJECT_NAME}  ==============")
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../cmake ${CMAKE_MODULE_PATH})
 
+if (${CMAKE_PROJECT_NAME} STREQUAL ${PROJECT_NAME})
+    # this will only be accessed when build restG4 as a standalone package, not when building the framework
+    CMAKE_MINIMUM_REQUIRED(VERSION 3.5)
+    find_package(REST REQUIRED)
+    string(FIND ${REST_LIBRARIES} "RestGeant4" REST_GEANT4_FOUND)
+    If (${REST_GEANT4_FOUND} EQUAL -1)
+        message(SEND_ERROR "REST found but 'RestGeant4' library is not present. Please install REST with Geant4Lib")
+    endif ()
+endif ()
+
 # Find ROOT
 find_package(ROOT REQUIRED COMPONENTS RIO Geom)
 execute_process(COMMAND root-config --cflags OUTPUT_VARIABLE ROOT_CFLAGS)
@@ -24,35 +34,24 @@ if (NOT EXISTS "${Geant4_INCLUDE_DIRS}/G4RunManagerFactory.hh")
     add_definitions(-DWITHOUT_G4RunManagerFactory)
 endif ()
 
-# Find REST
-if (NOT DEFINED REST_PATH)
-    if (DEFINED ENV{REST_PATH})
-        set(REST_PATH $ENV{REST_PATH})
-    else ()
-        message(FATAL_ERROR "ERROR ::: REST_PATH must be defined as an environment variable and point to REST install directory")
-        return()
-    endif ()
-endif ()
-
-if (NOT DEFINED rest_include_dirs)
-    set(rest_include_dirs ${REST_PATH}/include)
-endif ()
-
 if (NOT DEFINED CMAKE_INSTALL_PREFIX)
     set(CMAKE_INSTALL_PREFIX ${REST_PATH})
 endif ()
-message(STATUS "Using REST_PATH: ${REST_PATH}")
-message(STATUS "Using rest_include_dirs: ${rest_include_dirs}")
+
 message(STATUS "Package ${PROJECT_NAME} will be installed in ${CMAKE_INSTALL_PREFIX}")
 
 if (NOT CMAKE_CXX_FLAGS)
     set(CMAKE_CXX_FLAGS " -std=c++1y")
 endif ()
 
 # Set include and lib
-set(INCLUDE_DIRS ${PROJECT_SOURCE_DIR}/include ${ROOT_INCLUDE_DIRS} ${rest_include_dirs} ${Geant4_INCLUDE_DIR})
+set(INCLUDE_DIRS ${PROJECT_SOURCE_DIR}/include ${ROOT_INCLUDE_DIRS} ${Geant4_INCLUDE_DIR} ${REST_INCLUDE_DIRS})
 
-set(LINK_LIBRARIES ${Geant4_LIBRARIES} ${ROOT_LIBRARIES} RestGeant4)
+if (NOT ${CMAKE_PROJECT_NAME} STREQUAL ${PROJECT_NAME})
+    set(INCLUDE_DIRS ${INCLUDE_DIRS} ${rest_include_dirs})
+endif ()
+
+set(LINK_LIBRARIES ${Geant4_LIBRARIES} ${ROOT_LIBRARIES} RestFramework RestGeant4)
 string(STRIP "${LINK_LIBRARIES}" LINK_LIBRARIES)
 
 file(GLOB sources ${PROJECT_SOURCE_DIR}/src/*.cxx)
@@ -77,5 +76,7 @@ install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/mac
 # Install the executable to 'bin' directory under CMAKE_INSTALL_PREFIX
 install(TARGETS ${PROJECT_NAME} DESTINATION bin)
 
-set(package_added "${PROJECT_NAME} ")
-set(package_added ${package_added} PARENT_SCOPE)
+if (NOT ${CMAKE_PROJECT_NAME} STREQUAL ${PROJECT_NAME})
+    set(package_added "${PROJECT_NAME} ")
+    set(package_added ${package_added} PARENT_SCOPE)
+endif ()