ccache

• by default minimizes false positives as much as possible
• sloppiness may help at the expense of correct compilation (false positives)
• it’s hard to guarantee that source files are free of the macros file_macro,locale,time_macros
• ccache max_files = 0 is the default?
• Caches the compilation of a single file (multi-file compilation and linking will fallback)
• Some compiler flags are not supported (will fallback)
• Mozilla recommends using ccache