makefile - PARALLEL submakes -

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i have been working makefiles reduce compilation time. have 2 questions

1) found if run make in sub directory of main directory, runs perfectly. mean subdirectory independent of other sub-directories , can run in parallel?

2) how run sub-makes being called recursively in parallel? tell me other -j

recently simplified makefile, prerequisite other changes add features , speed things up.

the simplification included removing use or recursive make. surprised discover build twice fast (from 40 minutes 20 minutes). use -j option, improving speed more.

i made other changes had smaller effect.


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