cmakelists simplified after requiring cmake 3.16

CMakeLists.txt

@@ -2,7 +2,7 @@
 MESSAGE(STATUS "Starting WOLF CMakeLists ...")
 
 # Pre-requisites about cmake itself
-CMAKE_MINIMUM_REQUIRED(VERSION 3.10)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.16)
 
 # MAC OSX RPATH
 SET(CMAKE_MACOSX_RPATH 1)

test/gtest/CMakeLists.txt

-if(${CMAKE_VERSION} VERSION_LESS "3.11.0") 
-  message("CMake version less than 3.11.0")
+include(FetchContent)
 
-  # Enable ExternalProject CMake module
-  include(ExternalProject)
+FetchContent_Declare(
+  googletest
+  GIT_REPOSITORY https://github.com/google/googletest.git 
+  GIT_TAG main)
 
-  set(GTEST_FORCE_SHARED_CRT ON)
-  set(GTEST_DISABLE_PTHREADS ON) # without this in ubuntu 18.04 we get linking errors
-
-  # Download GoogleTest
-  ExternalProject_Add(googletest
-      GIT_REPOSITORY https://github.com/google/googletest.git
-      GIT_TAG        v1.8.x
-      # TIMEOUT 1 # We'll try this
-      CMAKE_ARGS -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG:PATH=DebugLibs
-      -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE:PATH=ReleaseLibs
-      -DCMAKE_CXX_FLAGS=${MSVC_COMPILER_DEFS}
-      -Dgtest_force_shared_crt=${GTEST_FORCE_SHARED_CRT}
-      -Dgtest_disable_pthreads=${GTEST_DISABLE_PTHREADS}
-      -DBUILD_GTEST=ON
-      PREFIX "${CMAKE_CURRENT_BINARY_DIR}"
-      # Disable install step
-      INSTALL_COMMAND ""
-      UPDATE_DISCONNECTED 1 # 1: do not update googletest; 0: update googletest via github
-  )
-
-  # Get GTest source and binary directories from CMake project
-
-  # Specify include dir
-  ExternalProject_Get_Property(googletest source_dir)
-  set(GTEST_INCLUDE_DIRS ${source_dir}/googletest/include PARENT_SCOPE)
-
-  # Specify MainTest's link libraries
-  ExternalProject_Get_Property(googletest binary_dir)
-  set(GTEST_LIBS_DIR ${binary_dir}/googlemock/gtest PARENT_SCOPE)
-
-  # Create a libgtest target to be used as a dependency by test programs
-  add_library(libgtest IMPORTED STATIC GLOBAL)
-  add_dependencies(libgtest googletest)
-
-  # Set libgtest properties
-  set_target_properties(libgtest PROPERTIES
-      "IMPORTED_LOCATION" "${binary_dir}/googlemock/gtest/libgtest.a"
-      "IMPORTED_LINK_INTERFACE_LIBRARIES" "${CMAKE_THREAD_LIBS_INIT}"
-  )
-
-else()
-
-  message("CMake version equal or greater than 3.11.0")
-
-  include(FetchContent)
-
-  FetchContent_Declare(
-    googletest
-    GIT_REPOSITORY https://github.com/google/googletest.git 
-    GIT_TAG main)
-
-  SET(INSTALL_GTEST OFF) # Disable installation of googletest
-  FetchContent_MakeAvailable(googletest)
-    
-endif()
-  
+SET(INSTALL_GTEST OFF) # Disable installation of googletest
+FetchContent_MakeAvailable(googletest)
+      
 function(wolf_add_gtest target)
   add_executable(${target} ${ARGN})
-  if(${CMAKE_VERSION} VERSION_LESS "3.11.0") 
-    add_dependencies(${target} libgtest)
-    target_link_libraries(${target} PUBLIC libgtest ${PLUGIN_NAME})
-    target_include_directories(${target} PUBLIC ${GTEST_INCLUDE_DIRS})
-  else()
-    target_link_libraries(${target} PUBLIC gtest_main ${PLUGIN_NAME})
-  endif()
+  target_link_libraries(${target} PUBLIC gtest_main ${PLUGIN_NAME})
   add_test(NAME ${target} COMMAND ${target})
 endfunction()