Re: multiple targets in one rule

[Dale King]

Paul D. Smith wrote:

> which is not what you want.  You need to use pattern rules;
> unfortunately they only work if there is a commonality between the
> target(s) and prerequisite(s).  Change the name of your input file to
> Python.g (or change the name of the output files to "python*"), then:
>
>  
This is something I would like to see corrected. There needs to be a 
simple way to express that two targets are created together using the 
same rule without resorting to patterns. The only question would be the 
syntax.

Two possibilities come to my mind either grouping the targets:

[ foo bar baz ] : biz
   @...

Or to use a different separator from the plain colon like:

foo bar baz &: biz
  @...

&: is only a random choice. There may be better choices.

And as I pointed out recently this is a big concern when start trying to 
parallel makes. Having it generate the files multiple times with 
parallel make may mean you are generating it when someone is reading the 
generated file.