Re: Problem with parallel make

[gmake]

On Sun, 30 Jul 2006, Paul D. Smith wrote:

> %% Lee Killough <address@hidden> writes:
>
>  lk> I can find no documentation on the + option, other than the
>  lk> documentation on the message, which says to use +.
>
> If you look in the index you'll find pointers to both the section
> "Instead of Executing the Commands" and "How the `MAKE' Variable Works",
> each of which contains a description.

Ah, there's a brief mention there. I looked in the index for + and could
not find anything except:

* +, and define:                         Sequences.

But other command prefixes were listed:

* - (in commands):                       Errors.
* @ (in commands):                       Echoing.

I did not find any reference to + on the main pages on "recursion", or
parallel make, so after not seeing it in the index, I assumed there wasn't
any documentation on +.

> As above, "+" _is_ explained pretty straightforwardly in the GNU make
> manual.
>
> Try looking here for more info on the jobserver:
>
>  http://make.paulandlesley.org/jobserver.html

Thanks.

>  lk> Perhaps a larger filehandle number, less likely to occur in common
>  lk> shell redirection idioms, should be used for the jobserver.
>
> Well, pipe(2) doesn't allow you to choose your own file descriptors: it
> just uses the lowest available descriptors.  I could use dup2(2) to
> force different ones after the pipe has been created, but there's no
> portable way in POSIX (that I know of) to find the maximum valid file
> descriptor.  I guess we could just use OPEN_MAX, if we can figure it
> out.

Understood.

Thanks,
Lee