Re: order-only prerequisites don't behave as I'd have expected after reading the documentation

[Philip Guenther]

On Mon, Jun 11, 2012 at 12:53 PM, Stefano Lattarini
<address@hidden> wrote:
...
> I was hoping to be able to the order-only prerequisites to enforce ordering
> between .PHONY targets.  At this point, I guess I should state the problem
> I am trying to solve rather than just the attempts I've made at solving it.
>
>   Is there an easy, scalable way to specify in a GNUmakefile that, whenever
>   two given targets T1 and T2 (either phony or not) are to be updated, T1's
>   recipe must be executed before T2's, all without declaring any dependency
>   of T2 on T1?  So that for example, assuming T1 and T2 are both phony:
>
>     $ make T1 # Only run T1's recipe
>     $ make T1 # Only run T2's recipe

(I think you meant "make T2" there...)


>     $ make T2 T1 # Run T1's recipe, then T2's recipe
>     $ make -j8 T2 T1 # Again, run T1's recipe, then T2's recipe

I think I would use a test on $(MAKECMDGOALS) to make T1 a
prerequisite of T2 if and only if T1 is a goal, say...

     ifneq ($(filter T1,${MAKECMDGOALS}),)
     T2: T1
     endif


Philip Guenther