Only add the CMake installation rules for version of CMake >= 3.3. No…

…t compatible with earlier versions.
Tessil · Oct 20, 2018 · 6a09674 · 6a09674
1 parent 8a3be75
commit 6a09674
Showing 1 changed file with 41 additions and 39 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.1)
 
-project(tsl_ordered_map VERSION 0.7.0)
+project(tsl_ordered_map VERSION 0.7.1)
 
 add_library(ordered_map INTERFACE)
 # Use tsl::ordered_map as target, more consistent with other libraries conventions (Boost, Qt, ...)
@@ -21,59 +21,61 @@ if(MSVC)
                    $<INSTALL_INTERFACE:tsl_ordered_map.natvis>)
 endif()
 
+# Only compatible with CMake version >= 3.8
 if(${CMAKE_VERSION} VERSION_GREATER "3.7") 
-    # Only available since version 3.8
     target_compile_features(ordered_map INTERFACE cxx_std_11)
 endif()
 
 
 
 
-# Installation
-include(CMakePackageConfigHelpers)
-include(GNUInstallDirs)
+# Installation (only compatible with CMake version >= 3.3)
+if(${CMAKE_VERSION} VERSION_GREATER "3.2")
+    include(CMakePackageConfigHelpers)
+    include(GNUInstallDirs)
 
-## Install include directory and potential natvis file
-install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include/tsl
-        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+    ## Install include directory and potential natvis file
+    install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include/tsl
+            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
-if(MSVC)
-    install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/tsl_ordered_map.natvis 
-            DESTINATION ".")
-endif()
+    if(MSVC)
+        install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/tsl_ordered_map.natvis 
+                DESTINATION ".")
+    endif()
 
 
 
-## Create and install tsl_ordered_mapConfig.cmake
-configure_package_config_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake.in
-                              ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
-                              INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
+    ## Create and install tsl_ordered_mapConfig.cmake
+    configure_package_config_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake.in
+                                ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+                                INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
 
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
-        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
+    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+            DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
 
-
+            
 
-## Create and install tsl_ordered_mapTargets.cmake
-install(TARGETS ordered_map
-        EXPORT ${PROJECT_NAME}Targets)
-
-install(EXPORT ${PROJECT_NAME}Targets
-        NAMESPACE tsl::
-        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
+    ## Create and install tsl_ordered_mapTargets.cmake
+    install(TARGETS ordered_map
+            EXPORT ${PROJECT_NAME}Targets)
+            
+    install(EXPORT ${PROJECT_NAME}Targets
+            NAMESPACE tsl::
+            DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
 
-
+            
 
-## Create and install tsl_ordered_mapConfigVersion.cmake
-# ordered_map is header-only and does not depend on the architecture.
-# Remove CMAKE_SIZEOF_VOID_P from tsl_ordered_mapConfigVersion.cmake so that an
-# tsl_ordered_mapConfig.cmake generated for a 64 bit target can be used for 32 bit
-# targets and vice versa.
-set(TSL_ORDERED_MAP_CMAKE_SIZEOF_VOID_P ${CMAKE_SIZEOF_VOID_P})
-unset(CMAKE_SIZEOF_VOID_P)
-write_basic_package_version_file(${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
-                                 COMPATIBILITY SameMajorVersion)
-set(CMAKE_SIZEOF_VOID_P ${TSL_ORDERED_MAP_CMAKE_SIZEOF_VOID_P})
+    ## Create and install tsl_ordered_mapConfigVersion.cmake
+    # ordered_map is header-only and does not depend on the architecture.
+    # Remove CMAKE_SIZEOF_VOID_P from tsl_ordered_mapConfigVersion.cmake so that an
+    # tsl_ordered_mapConfig.cmake generated for a 64 bit target can be used for 32 bit
+    # targets and vice versa.
+    set(TSL_ORDERED_MAP_CMAKE_SIZEOF_VOID_P ${CMAKE_SIZEOF_VOID_P})
+    unset(CMAKE_SIZEOF_VOID_P)
+    write_basic_package_version_file(${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+                                    COMPATIBILITY SameMajorVersion)
+    set(CMAKE_SIZEOF_VOID_P ${TSL_ORDERED_MAP_CMAKE_SIZEOF_VOID_P})
 
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
-        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
+    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+            DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
+endif()