Re: GNUMAKE: rebuild target when any of the dependencies are done

[John Graham-Cumming]

Yuri Shtil wrote:
> The idea is to run gmake with -j so that targets ONE and TWO build
> concurrently. I want to start the script for all when the FIRST target
> finishes, not to wait until both are done.

Hmm.  So basically, it's ok for the all target target to run its 
commands as soon as either One or Two has finished.  That implies that 
One and Two are not really dependencies of all (i.e. things that need to 
be done before all is done) and hence the all: One Two isn't the right 
way to express it in GNU Make.

You could just run GNU Make with One and Two as command-line goals:

    make -j2 One Two

Or you could use a :: and some protection that the commands don't get 
run twice.

    all:: One
        $(ALLCMDS)

    all:: Two
        $(ALLCMDS)

You'd need to make ALLCMDS check that it hasn't already been run.

Or you could push the ALLCMDS further up the tree:

    .PHONY: all allone alltwo
    all: allone alltwo

    allone: One
        $(ALLCMDS)

    alltwo: Two
        $(ALLCMDS)

John.
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John Graham-Cumming
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