[CMake] custom target (kernel modules)

[Clark J. Wang]

On 6/28/07, Alan W. Irwin <irwin at beluga.phys.uvic.ca> wrote:
>
> On 2007-06-28 10:08-0400 Alexandru Ciobanu wrote:
>
> > Hi!
> >
> > I am trying to build kernel modules with CMake. To do that I
> > use the command below:
> >
> >  add_custom_target ( manager.ko ${kbuild_cmd}
> >     WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/linux
> >     DEPENDS ${src} linux/Kbuild
> >  )
> >
> > The problem is that nobody depends on this custom target and so it is
> > never build when running make.
> >
> > If I use the ALL parameter in add_custom_target() it will always rebuild
> it,
> > even if none of source files has changes.
> >
> > So how do I make this work so that it builds when I run make but also
> > builds only when necessary, like any other target add_library(),
> > add_executable(), etc. ?
>
> Use ADD_CUSTOM_COMMAND instead with an empty (COMMANDless)
> ADD_CUSTOM_TARGET
> with the ALL parameter that-file depends on the custom command.


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?

Thanks.

Alan
> __________________________
> Alan W. Irwin
>
> Astronomical research affiliation with Department of Physics and
> Astronomy,
> University of Victoria (astrowww.phys.uvic.ca).
>
> Programming affiliations with the FreeEOS equation-of-state implementation
> for stellar interiors (freeeos.sf.net); PLplot scientific plotting
> software
> package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
> Linux Links project (loll.sf.net); and the Linux Brochure Project
> (lbproject.sf.net).
> __________________________
>
> Linux-powered Science
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