Re: Has anyone ever tried this technique for creating target parent directories?

[Bryan Ischo]

On 11/19/11 22:43, Bryan Ischo wrote:
> I have seen alot of suggestions for how to handle directory creation 
> for targets, but never the one that I have come up with.  Has anyone 
> done this previously?
>
>
> Also - I am far from a make expert.  Is there anything suboptimal or 
> ugly about my solution that could be made tidier? 

OK well I just found a page that lists a similar solution:

http://www.cmcrossroads.com/ask-mr-make/6936-making-directories-in-gnu-make

Solution 3: ("*use a directory 'marker' file*") seems to be very close 
to what I am proposing.  In fact it is identical except for the fact 
that it doesn't use a pattern rule (the target is specific to an output 
directory), and it also touches the "marker" file rather than never 
creating it as I do.

Another solution, solution 5 ("*use pattern rules, second expansion and 
a marker file") is close as well, but it looks to me like an 
unnecessarily complicated way to use pattern rules.  Instead of using 
SECONDEXPANSION to allow the directory name of the target to be computed 
(i.e. $$(@D)/.f), I just repeat the target pattern and add "/../.dir" to 
the end, e.g. "%/../.dir".*
**
*Is there a good reason to use SECONDEXPANSION as this person suggests 
in solution 5, instead of the simpler pattern-based prerequisite 
mechanism that I am using?*
**
*Also is there really a good reason to actually touch the marker file 
instead of just never bothering to create it?*
**
*Thanks!*
*Bryan*

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