find_package gtest or fetch gtest ; and use it for testing.Remove usa…

…ge of the old one

Sofa/framework/Testing/CMakeLists.txt

@@ -4,10 +4,54 @@ project(Sofa.Testing LANGUAGES CXX)
 # Enable testing features of cmake, like the add_test() command.
 enable_testing()
 
-# add gtest library
-# set(gtest_disable_pthreads ON CACHE INTERNAL "")
-add_subdirectory(extlibs/gtest)
-# add custom gtest main
+# add googletest library
+# set(googletest_disable_pthreads ON CACHE INTERNAL "")
+find_package(googletest QUIET)
+if(NOT googletest_FOUND AND SOFA_ALLOW_FETCH_DEPENDENCIES)
+    message("${PROJECT_NAME}: DEPENDENCY googletest NOT FOUND. SOFA_ALLOW_FETCH_DEPENDENCIES is ON, fetching googletest...")
+
+    include(FetchContent)
+    FetchContent_Declare(googletest
+            GIT_REPOSITORY https://github.com/google/googletest
+            GIT_TAG        v1.14.0
+    )
+
+    FetchContent_GetProperties(googletest)
+    if(NOT googletest_POPULATED)
+        FetchContent_Populate(googletest)
+
+        set(BUILD_GMOCK OFF CACHE INTERNAL "")
+        set(BUILD_SHARED_LIBS ON CACHE BOOL "" FORCE)
+        set(INSTALL_GTEST OFF CACHE BOOL "" FORCE) # rely on SOFA macros
+        set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+        set(gtest_disable_pthreads OFF CACHE BOOL "" FORCE)
+
+        message("${PROJECT_NAME}: adding subdirectory ${googletest_SOURCE_DIR}")
+
+        add_subdirectory(${googletest_SOURCE_DIR} ${googletest_BINARY_DIR})
+
+        target_compile_options(gtest_main PRIVATE "-GTEST_LINKED_AS_SHARED_LIBRARY=0")
+        target_compile_options(gtest PRIVATE "-DGTEST_CREATE_SHARED_LIBRARY=1")
+
+        include(SofaMacros)
+        sofa_create_package_with_targets(
+            PACKAGE_NAME GTest
+            PACKAGE_VERSION 1.14.0
+            TARGETS gtest AUTO_SET_TARGET_PROPERTIES
+            INCLUDE_SOURCE_DIR "include"
+            INCLUDE_INSTALL_DIR "extlibs/GTest"
+            )
+
+        set_target_properties(gtest PROPERTIES FOLDER Testing)
+        set_target_properties(gtest_main PROPERTIES FOLDER Testing)
+    endif()
+elseif (NOT googletest_FOUND)
+    message(FATAL_ERROR "${PROJECT_NAME}: DEPENDENCY googletest NOT FOUND. SOFA_ALLOW_FETCH_DEPENDENCIES is OFF and thus cannot be fetched. Install googletest, or enable SOFA_ALLOW_FETCH_DEPENDENCIES to fix this issue.")
+endif()
+
+
+
+# add custom googletest main
 add_subdirectory(SofaGTestMain)
 
 set(SOFATESTINGSRC_ROOT "src/sofa/testing")
@@ -39,6 +83,8 @@ sofa_find_package(Sofa.Simulation.Graph REQUIRED)
 
 add_library(${PROJECT_NAME} SHARED ${HEADER_FILES} ${SOURCE_FILES})
 target_link_libraries(${PROJECT_NAME} PUBLIC Sofa.Helper Sofa.DefaultType Sofa.Core Sofa.Simulation.Graph gtest SofaGTestMain )
+target_compile_options(${PROJECT_NAME} PUBLIC "-DGTEST_LINKED_AS_SHARED_LIBRARY=1")
+
 set(SOFA_TESTING_RESOURCES_DIR "${CMAKE_CURRENT_SOURCE_DIR}/resources")
 
 set_target_properties(${PROJECT_NAME} PROPERTIES FOLDER Sofa.Framework) # IDE folder

Sofa/framework/Testing/GTestConfig.cmake.in

@@ -0,0 +1,10 @@
+# CMake package configuration file for the gtest library
+
+@PACKAGE_GUARD@
+@PACKAGE_INIT@
+
+if(NOT TARGET gtest)
+    include("${CMAKE_CURRENT_LIST_DIR}/GTestTargets.cmake")
+endif()
+
+check_required_components(gtest)