Add concepts for GNU

CMakeLists.txt

@@ -9,6 +9,10 @@ set(STATICC TRUE)
 include(CMakeLists.txt.in)
 include_pkmnlib()
 
+if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    add_compile_options(-fconcepts)
+endif ()
+
 file(GLOB_RECURSE SRC_FILES src/*.cpp src/*.hpp)
 add_executable(PokemonScriptTester ${SRC_FILES})
 target_precompile_headers(PokemonScriptTester PUBLIC src/Precompiled.hxx)