FindSDL: Add SDL_INCLUDE_DIRS, SDL_LIBRARIES, and SDL::SDL

Also provide `SDL_VERSION[_{MAJOR,MINOR,PATCH}]`.

Fixes: #12911

3 files changed, 47 insertions, 0 deletions

diff --git a/Tests/FindSDL/CMakeLists.txt b/Tests/FindSDL/CMakeLists.txt
new file mode 100644
index 0000000000..e786204dd4
--- /dev/null
+++ b/Tests/FindSDL/CMakeLists.txt
@@ -0,0 +1,10 @@
+add_test(NAME FindSDL.Test COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindSDL/Test"
+  "${CMake_BINARY_DIR}/Tests/FindSDL/Test"
+  ${build_generator_args}
+  --build-project TestFindSDL
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )
diff --git a/Tests/FindSDL/Test/CMakeLists.txt b/Tests/FindSDL/Test/CMakeLists.txt
new file mode 100644
index 0000000000..61d4f4b334
--- /dev/null
+++ b/Tests/FindSDL/Test/CMakeLists.txt
@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.1)
+project(TestFindSDL C)
+include(CTest)
+
+find_package(SDL)
+
+add_definitions(
+  -DCMAKE_EXPECTED_SDL_VERSION_MAJOR=${SDL_VERSION_MAJOR}
+  -DCMAKE_EXPECTED_SDL_VERSION_MINOR=${SDL_VERSION_MINOR}
+  -DCMAKE_EXPECTED_SDL_VERSION_PATCH=${SDL_VERSION_PATCH})
+
+add_executable(test_sdl_tgt main.c)
+target_link_libraries(test_sdl_tgt SDL::SDL)
+add_test(NAME test_sdl_tgt COMMAND test_sdl_tgt)
+
+add_executable(test_sdl_var main.c)
+target_include_directories(test_sdl_var PRIVATE ${SDL_INCLUDE_DIRS})
+target_link_libraries(test_sdl_var PRIVATE ${SDL_LIBRARIES})
+add_test(NAME test_sdl_var COMMAND test_sdl_var)
diff --git a/Tests/FindSDL/Test/main.c b/Tests/FindSDL/Test/main.c
new file mode 100644
index 0000000000..057289ceb2
--- /dev/null
+++ b/Tests/FindSDL/Test/main.c
@@ -0,0 +1,18 @@
+#include <SDL.h>
+
+int main()
+{
+  // Test 1 requires headers only.
+  SDL_version compiled;
+  SDL_VERSION(&compiled);
+  if (compiled.major != CMAKE_EXPECTED_SDL_VERSION_MAJOR ||
+      compiled.minor != CMAKE_EXPECTED_SDL_VERSION_MINOR ||
+      compiled.patch != CMAKE_EXPECTED_SDL_VERSION_PATCH)
+    return 1;
+
+  // Test 2 requires to link to the library.
+  if (SDL_WasInit(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0)
+    return 2;
+
+  return 0;
+}