Fix GCC builds with Debug build type

src/common/CMakeLists.txt

@@ -241,6 +241,15 @@ if (MSVC)
   )
 else()
   set_source_files_properties(stb.cpp PROPERTIES COMPILE_OPTIONS "-Wno-implicit-fallthrough;-Wno-missing-declarations;-Wno-missing-field-initializers")
+
+  # Get around GCC failing with intrinsics in Debug
+  if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_BUILD_TYPE MATCHES "Debug")
+    set_property(
+      SOURCE stb.cpp
+      APPEND
+      PROPERTY COMPILE_OPTIONS ";-O2"
+    )
+  endif()
 endif()
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")