Fetch GoogleTest if not installed

Author: paulej

CMakeLists.txt

@@ -15,6 +15,7 @@ project(libgse
         DESCRIPTION "Game State Encoder Library"
         LANGUAGES CXX)
 
+add_subdirectory(dependencies)
 add_subdirectory(src)
 
 include(CTest)

dependencies/CMakeLists.txt

@@ -0,0 +1,8 @@
+if(gse_BUILD_TESTS)
+    find_package(GTest)
+
+    if(NOT GTest_FOUND)
+        message(STATUS "Fetching GTest since it is not available on the system")
+        add_subdirectory(googletest)
+    endif()
+endif()

dependencies/googletest/CMakeLists.txt

@@ -0,0 +1,22 @@
+include(FetchContent)
+
+FetchContent_Declare(GTest
+    GIT_REPOSITORY https://github.com/google/googletest.git
+    GIT_TAG        v1.13.0
+    OVERRIDE_FIND_PACKAGE)
+
+if(WIN32)
+    # For Windows: Prevent overriding the parent project's
+    # compiler/linker settings
+    # (https://github.com/google/googletest/tree/v1.13.0/googletest)
+    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+endif()
+
+# Prevent GTest from installing
+set(INSTALL_GTEST OFF CACHE INTERNAL "Disable gtest installation")
+
+FetchContent_MakeAvailable(GTest)
+
+add_library(GTest::GTest INTERFACE IMPORTED GLOBAL)
+add_library(GTest::Main INTERFACE IMPORTED GLOBAL)
+target_link_libraries(GTest::GTest INTERFACE gtest_main)

test/test_databuffer/CMakeLists.txt

@@ -6,8 +6,6 @@ set_target_properties(test_databuffer
         CXX_STANDARD_REQUIRED YES
         CXX_EXTENSIONS NO)
 
-include(GoogleTest)
-
 target_link_libraries(test_databuffer PRIVATE gse GTest::GTest GTest::Main)
 
 add_test(NAME test_databuffer

test/test_float/CMakeLists.txt

@@ -6,8 +6,6 @@ set_target_properties(test_float
         CXX_STANDARD_REQUIRED YES
         CXX_EXTENSIONS NO)
 
-include(GoogleTest)
-
 target_link_libraries(test_float PRIVATE GTest::GTest GTest::Main)
 
 add_test(NAME test_float

test/test_gs_api/CMakeLists.txt

@@ -6,8 +6,6 @@ set_target_properties(test_gs_api
         CXX_STANDARD_REQUIRED YES
         CXX_EXTENSIONS NO)
 
-include(GoogleTest)
-
 target_link_libraries(test_gs_api PRIVATE gse GTest::GTest GTest::Main)
 
 add_test(NAME test_gs_api

test/test_gs_decoder/CMakeLists.txt

@@ -6,8 +6,6 @@ set_target_properties(test_gs_decoder
         CXX_STANDARD_REQUIRED YES
         CXX_EXTENSIONS NO)
 
-include(GoogleTest)
-
 target_link_libraries(test_gs_decoder PRIVATE gse GTest::GTest GTest::Main)
 
 add_test(NAME test_gs_decoder

test/test_gs_deserializer/CMakeLists.txt

@@ -8,8 +8,6 @@ set_target_properties(test_gs_deserializer
 
 target_include_directories(test_gs_deserializer PRIVATE ${CMAKE_SOURCE_DIR}/src/gse/src)
 
-include(GoogleTest)
-
 target_link_libraries(test_gs_deserializer PRIVATE gse GTest::GTest GTest::Main)
 
 add_test(NAME test_gs_deserializer

test/test_gs_encoder/CMakeLists.txt

@@ -6,8 +6,6 @@ set_target_properties(test_gs_encoder
         CXX_STANDARD_REQUIRED YES
         CXX_EXTENSIONS NO)
 
-include(GoogleTest)
-
 target_link_libraries(test_gs_encoder PRIVATE gse GTest::GTest GTest::Main)
 
 add_test(NAME test_gs_encoder

test/test_gs_serializer/CMakeLists.txt

@@ -6,8 +6,6 @@ set_target_properties(test_gs_serializer
         CXX_STANDARD_REQUIRED YES
         CXX_EXTENSIONS NO)
 
-include(GoogleTest)
-
 target_link_libraries(test_gs_serializer PRIVATE gse GTest::GTest GTest::Main)
 
 add_test(NAME test_gs_serializer