Re: cost of -MP

[Boris Kolpackov]

Noel Yap <address@hidden> writes:

> Interesting, non-recursive was slower than recursive.  I suppose I can see 
> this happening if there weren't that many directories in the project.  How 
> many directories do you have?

It is 19 make re-executions. The reason non-recursive is slower is that I 
haven't had a chance to optimize it yet. I actually expect it to be faster 
than recursive (for obvious reasons). 
 
> Regarding the topic at hand, we don't use -MP, but post-process the output 
> and create empty targets for the header files.  For example:
> 
>         my_header:

That's exactly what gcc does.

 
> We haven't performed any time comparisons, though.

Depending on how long it takes make to find out nothing needs to be done
this could be worthwhile.

-boris

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