Re: Make question

[John Calcote]

Darn it Eric! I keep forgetting about your site. I'm going to have to put a yellow sticky note on my computer so I remember to go read this stuff. These are GREAT articles.

Thanks,
John

On 2/5/2010 9:40 AM, Eric Melski wrote:

Canham, Timothy K (316C) wrote:

We have code generation, and we have  a rule like this:

fileout1.txt fileout2.txt fileout3.txt: filein.txt
	filegen.sh filein.txt

We run a parallel make (make -j x), and what I've found is that the rule often gets invoked three times, causes files to overwrite each other.  

...

Is there a way to specify the rule so that the rule is only invoked once in a parallel make, or is there a technique that accomplishes the same thing?
  

Have a look at my article "Rules with Multiple Outputs in GNU Make" at CM Crossroads:

http://cmcrossroads.com/ask-mr-make/12908-rules-with-multiple-outputs-in-gnu-make

That covers the various techniques for solving this problem and the pros and cons of each.

HTH,

Eric Melski
Electric Cloud, Inc.
http://blog.electric-cloud.com/

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