background jobs in makefile

[James]

all:
for f in xx yy; do\
(make $$f &);\
done;\
wait
@echo [ $@:done ]

xx yy:
sleep 2
@echo [ $@:done ]

How do I put backgroud jobs in makefile?
"wait" does not seem to work here.

TIA
jl

[Henrik Carlqvist]

The right way to do it:

Makefile:
-8<-------------------------
all: xx yy

xx yy:
sleep 2
@echo [ $@:done ]

-8<-------------------------

Then, at the command prompt type:

make -j 5

The number after -j is the maximum number of simultaneous jobs that make
will spawn. It is also possible (but sometimes dangerous) to not give any
number att all:

make -j

Then make does not limit the number of simultaneous jobs spawned.

regards Henrik
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