STATIC DIRS

From MDC

This makefile variable lists source directories whose makefiles don't follow the usual conventions for Mozilla non-root makefiles, and need special handling.

• As the root makefile iterates over the application's tiers, it invokes the tiers' static directory's makefiles differently; see the explanation of build tiers for details.
• Whereas the standard make rules regenerate non-static directory makefiles as needed using the build/autoconf/make-makefile script, they assume static directory makefiles are produced by the top-level {{source|configure.in} script and updated in some other way, and don't try to regenerate them.
• STATIC_DIRS is set according to TIERS and the tier_t_staticdirs variables.