[LLVMdev] avoid creating .dir files

[Chris Lattner]

On Jan 19, 2009, at 3:04 PM, Mike Stump wrote:

> On Jan 19, 2009, at 1:58 PM, Chris Lattner wrote:
>> On Jan 19, 2009, at 10:02 AM, Mike Stump wrote:
>>
>>> There isn't a good reason to create files called .dir in the
>>> installation directory.  This patch fixes that.
>>
>> If we don't have this line, every build with do the makedir.
>
> And?
>
> $ time mkdir -p /bin
>
> real	0m0.002s
> user	0m0.000s
> sys	0m0.002s

Ok! You win, :)

-Chris

>
>
> an extra mkdir takes around 2ms per build.  An up-to-date inc build
> takes 2231ms for me.  If you want some of the extra 2231ms back, I'd
> recommend avoiding recursion in the makefiles.  This will yield a
> larger benefit than worrying about the extra mkdir.
>
> If we have it, then .dir files are created in the installation
> directories.
>
> Trivially one can do:
>
> /dir:
> 	mkdir /dir
>
> /dir/prog: /dir
> 	gcc hi.c -o /dir/prog
>
> and avoid the extra mkdir, if one wanted.  Any down side to doing  
> that?
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