[CMake] custom target (kernel modules)

[Alexandru Ciobanu]

Hi, Clark!

Here is the reason why I wanted to use this approach.

I use ADD_CUSTOM_COMMAND and ADD_CUSTOM_TARGET because I don't want
to run that Makefile at all if the files did not change.

ADD_CUSTOM_TARGET with ALL parameter would always run make. And even if 
there
are no modifications to the source files, you'll see something like this 
on the screen:
   [make] I've been in that dir
   [make] nothing to do there
   [make] all targets ok, leaving, I'm done, etc..
And this will appear every time you build.

I don't want that on my screen. It strains my eyes. I want a clean 
output. =)

When combined, the above commands, always try to build the target, but 
run make
only when needed -> no extra stuff on the screen (unless modifications 
detected).

Alex Ciobanu



Clark J. Wang wrote:
> On 6/29/07, *Alan W. Irwin* <irwin at beluga.phys.uvic.ca 
> <mailto:irwin at beluga.phys.uvic.ca>> wrote:
>
>     On 2007-06-29 09:04+0800 Clark J. Wang wrote:
>
>     > On 6/28/07, Alan W. Irwin <irwin at beluga.phys.uvic.ca
>     <mailto:irwin at beluga.phys.uvic.ca>> wrote:
>     >>
>     >> On 2007-06-28 10:08-0400 Alexandru Ciobanu wrote:
>     >> > If I use the ALL parameter in add_custom_target() it will
>     always rebuild
>     >> it,
>     >> > even if none of source files has changes.
>     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
>     > Hi Alan, I have a question here. Why bother to call both
>     ADD_CUSTOM_COMMAND
>     > and ADD_CUSTOM_TARGET? It seems like only ADD_CUSTOM_TARGET with ALL
>     > parameter is enough. Does your method have some advantage?
>
>     See above quote from Alexandru.  Also, if you read the
>     ADD_CUSTOM_TARGET
>     documentation, the reason why it always rebuilds is fully
>     explained there.
>
>     "The target has no output file and is ALWAYS CONSIDERED OUT OF
>     DATE...." 
>
>
> I see. Thank you so much.
>
>     Alan
>
>     __________________________
>     Alan W. Irwin
>
>     Astronomical research affiliation with Department of Physics and
>     Astronomy,
>     University of Victoria (astrowww.phys.uvic.ca
>     <http://astrowww.phys.uvic.ca>).
>
>     Programming affiliations with the FreeEOS equation-of-state
>     implementation
>     for stellar interiors (freeeos.sf.net <http://freeeos.sf.net>);
>     PLplot scientific plotting software
>     package (plplot.org <http://plplot.org>); the libLASi project (
>     unifont.org/lasi <http://unifont.org/lasi>); the Loads of
>     Linux Links project (loll.sf.net <http://loll.sf.net>); and the
>     Linux Brochure Project
>     (lbproject.sf.net <http://lbproject.sf.net>).
>     __________________________
>
>     Linux-powered Science
>     __________________________
>
>
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