message: cmake: add option to use/install the non-amalgamated version
diff: @@ -16,12 +16,12 @@ include(ExternalProject)
  ## OPTIONS
  ##
  option(JSON_BuildTests "Build the unit tests when BUILD_TESTING is enabled." ON)
  +option(JSON_MultipleHeaders "Use non-amalgamated version of the library." OFF)
  ##
  ## CONFIGURATION
  ##
  set(NLOHMANN_JSON_TARGET_NAME ${PROJECT_NAME})
  -set(NLOHMANN_JSON_SOURCE_DIR "src/")
  set(NLOHMANN_JSON_CONFIG_INSTALL_DIR "lib/cmake/${PROJECT_NAME}")
  set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR "include")
  set(NLOHMANN_JSON_HEADER_INSTALL_DIR "${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}/nlohmann")
  @@ -31,6 +31,12 @@ set(NLOHMANN_JSON_CMAKE_CONFIG_DIR "${CMAKE_CURRENT_BINARY_DIR}/cmake_c
  set(NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
  set(NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Config.cmake")
  +if (JSON_MultipleHeaders)
  + set(NLOHMANN_JSON_SOURCE_DIR "develop/")
  +else()
  + set(NLOHMANN_JSON_SOURCE_DIR "src/")
  +endif()
  +
  ##
  ## TARGET
  ## create target and add include path
  @@ -40,7 +46,7 @@ add_library(${NLOHMANN_JSON_TARGET_NAME} INTERFACE)
  target_include_directories(
  ${NLOHMANN_JSON_TARGET_NAME}
  INTERFACE
  - $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src>
  + $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/${NLOHMANN_JSON_SOURCE_DIR}>
  $<INSTALL_INTERFACE:include>
  )
  