[cmake-developers] Use OBJECT_DEPENDS in qt4_generate_moc() ?

[Clinton Stimpson]

On Friday, June 15, 2012 09:56:51 PM Alexander Neundorf wrote:
> Hi,
> 
> attached is a small patch which sets the OBJECT_DEPENDS  property of a moced
> file to the generated moc file.
> This has the effect that before the cpp file is built, moc has been run on
> it. We have that in KDE's version of qt4_generate_moc() this way since 2006
> and it works for us.
> In cmake's version, it was removed January 11th 2008, the removed call to
> MACRO_ADD_FILE_DEPENDENCIES():
> http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=510f578f8b53858fbb541c4e7
> e4731de9bfbd483
> 
> Now since we are trying to get rid of our custom stuff in KDE, we hit that
> issue when trying to build parts of KDE with FindQt4.cmake from cmake.
> 
> Do you remember why this line was removed ?
> What do you think about adding it again, as the attached patch does ?
> 
> Alex

It was probably removed because I thought add_custom_command() already added 
the needed dependency information.

It should already have this:
mocable.h -> moc_mocable.cpp ->  moc_mocable.o
or
mocable.h -> mocable.moc -> mocable.cpp (includes mocable.moc)

Why do we need the extra dependency like this?
mocable.h -> mocable.cpp

-- 
Clinton Stimpson
Elemental Technologies, Inc
Computational Simulation Software, LLC
www.csimsoft.com