[CMake] FindMKL.cmake

[David Cole]

On Thu, Feb 10, 2011 at 8:01 AM, Michael Wild <themiwi at gmail.com> wrote:

> On 02/10/2011 01:52 PM, David Cole wrote:
> > On Thu, Feb 10, 2011 at 2:50 AM, Robert Bielik <robert.bielik at xponaut.se
> >wrote:
> > Michael Wild skrev 2011-02-09 16:48:
> >
> >>
> >>  what about this:
> >>>
> >>> file(GLOB_RECURSE glob_results "/some/pattern*")
> >>> set(dirs)
> >>> foreach(f IN LISTS glob_results)
> >>>   get_filename_component(d "${f}" PATH)
> >>>   list(APPEND dirs "${d}")
> >>> endforeach()
> >>> list(REMOVE_DUPLICATES dirs)
> >>>
> >>
> >> Yeah, works fine but it seems to be a lot slower than using the nested
> >> file(GLOB...) macro approach, but I don't know why.
> >>
> >
> >
> > Probably because there are thousands of files, but only tens of
> directories.
> > Bang! 100x slower.
> >
>
> But the other macro also touches every file and directory and is even
> recursive. I think the real cost is in the list(REMOVE_DUPLICATES) call.
>


Absolutely. But the number of elements in that list will be the number of
files encountered in the full recursive glob, which is probably much larger
than the number of elements conditionally added to the list involved in the
macro approach.



> Michael
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