<< Inter-module optimization >>

• The classic approach hurts run-time as well as compile-time.
• Compiler has available only information in the current file, plus included headers.
• Compiler cannot make use of information in other modules until they get linked together.
• Specifially cannot inline across modules.
• This is why critical information (inline functions and templates) migrates into headers.
• This talk focuses on compile speed, but be aware that it also enables important optimizations.