going forward, instead of using the printf style syntax for panics we use the c++ stream syntax The new macros that replace ASSERT_*CONDITON are FILAMENT_CHECK_PRECONDITON FILAMENT_CHECK_POSTCONDITION FILAMENT_CHECK_ARITIHMETIC Example usage: FILAMENT_CHECK_PRECONDITON(condition) << "Message"; It's also now possible to define FILAMENT_PANIC_USES_ABSL=1 to redirect all these calls to Abseil's CHECK() macro.