Parallelization of recursive jobs in GNU make

Question

I am looking for an elegant way for the parallelization of jobs in GNU make. Here is a sample of what I did so far. Make processes the directories dir-1, dir-2 and dir-3 in a se

Answer 1

I found that when using the :: (double-colon rule), I could not find a way to force order if there were any dependencies among app, lib, and doc. After reading much of the GNU Make manual, I came up with the following rules to enforce the dependencies at the same time as having a generic recursive make. Notice that the .PHONY rule is there to force make to enter the directory even though the directory already exists.

SUBDIRS = app lib doc

default: all

app: lib

.PHONY: $(SUBDIRS)

$(SUBDIRS):
    $(MAKE) -C $@ $(MAKECMDGOALS)

all clean install: $(SUBDIRS)