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Re: background jobs in makefile

From: Henrik Carlqvist
Subject: Re: background jobs in makefile
Date: Wed, 08 Dec 2010 15:04:04 -0000
User-agent: Pan/0.14.2 (This is not a psychotic episode. It's a cleansing moment of clarity.)

James <> wrote:
> 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.

The right way to do it:

all: xx yy

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

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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