Qt update

[Alberto Mardegan]

Hi,

On 04/08/2013 03:36 AM, Dirk Hohndel wrote:
> I worked with Tomaz to get his build issues sorted out. The solution was
> just pushed to the Qt branch. The Makefile in there isn't exactly where
> I would want to be, but it seems to work for him (and me) and allows the
> Qt UI development to move forward.

I'll check it later tonight. Strange that it had to be moved, though.

> There are two things we'd rather have differently in the Makefile but my
> make-foo is insufficient to make that happen
>
> a) right now I need to explicitly create the dependency from the moc and
> ui_*.h files to the object file in order to get those rebuilt. Is there
> a way to detect the need to build those and create the dependencies
> automagically? Maybe for every .cpp file in qt-ui ?
>
> qt-ui/maintab.o: qt-ui/maintab.moc qt-ui/ui_maintab.h

My make-fu is also insufficient to work out a way to detect the 
dependencies, but an approach based on the file name is quite easy to 
produce.

Something like

   qt-ui/%.o: qt-ui/%.moc qt-ui/ui_%.h

assuming that all files in qt-ui need this. If not, I'll give it a try 
with make-fu as well: I suppose that something like this *might* work:

# Find which object files need this special treatment
OBJS_NEEDING_MOC = $(grep -l '^#include ".*\.moc"' $(OBJS:.o=.c))

# Extra dependency for the files found above
$(OBJS_NEEDING_MOC): qt-ui/%.o: qt-ui/%.moc qt-ui/ui_%.h

See http://www.gnu.org/software/make/manual/html_node/Static-Usage.html


> b) right now the .cpp files have to manually include the .moc files at
> the end. I'm sure we could have the Makefile automatically compile the
> .moc files and add them to the objects that are linked together.
>
> I'm pretty sure that's what the .moc.cpp style rules were supposed to
> do, but I couldn't make that work for me.

Nope, I'm afraid that that #include at the end must stay. The reason is 
that the #include'd .moc file defines some methods/members for a class 
which is declared in the .cpp file. Therefore, if you compiled it 
separately, the compiler wouldn't find the declaration of the class, and 
would spit errors.

> So if any of the Makefile Magicians would like a little challenge...
> patches welcome :-)

I hope I'll have time tonight. If not, tomorrow is another day :-)

Ciao,
   Alberto