Re: improvements for parallel makes ?

[Boris Kolpackov]

Alexey,

Alexey Neyman <address@hidden> writes:

> Ok, let's consider the following makefile fragment:
>
> <<<<<<
> local_objects = a.o b.o c.o d.o
>
> all: all-recursive all-local
>
> all-recursive:
>       $(MAKE) -C subdir all
>
> all-local: % all-recursive
>
> all-local: $(local_objects)
> <<<<<<
>
> The intention is clear: the recursive make in subdirectories shall be
> finished before local objects are remade. However, with this
> makefile, make will behave as follows:
>
> 1. make will start a job for "all-recursive" target
> 2. make will notice that it has spare jobs, and will consider the
> target all-local.
> 3. all-local target has dependencies, and before making all-local
> target itself, make will update its dependencies - in parallel with
> the running "all-recursive" job.

Thanks for refreshing my memory. I guess you are right about the
further relaxed order-only prerequisites being too low-level.
Maybe it is a good idea to implement .WAIT in terms of them, as
you have suggested.

-boris