Re: [sigc] How to include libsigc

[Ulrich Eckhardt <eckhardt satorlaser com>]

Paul Giblock wrote:
> #ifndef _WIDGET_H_
> #define _WIDGET_H_

I have no idea if it makes a diff, but I personally don't take chances in 
this. Therefore: macros with an underscore and a capital are reserved to the 
compiler/stdlib, never use them! Other than that, this include guard is sooo 
generic that it almost cries for colliding with others (by other widgetsets). 
Add some random data plus the creation date and you're much safer.

> #include <sigc++/sigc++.h>

This is supposed to work.

> widget.o: widget.cpp widget.h
>      g++ ${CCFLAGS} -c widget.cpp `pkg-config --cflags --libs sigc
>          ++-2.0`
>
>
> Unfortunately, this is what gcc spits out:
>
> g++ -Wall -O2 -c widget.cpp `pkg-config --cflags --libs sigc++-2.0`
> g++: -lsigc-2.0: linker input file unused because linking not done

C'mon, you should try to understand what pkg-config does and then fix this 
warning.

> g++ -Wall -O2 -c agesmgr.cpp
> In file included from agesmgr.h:7,
>                  from agesmgr.cpp:3:
> widget.h:25:27: sigc++/sigc++.h: No such file or directory

This is a totally different file. Once you understood what pkg-config does you 
will definitely be able to fix this one, too.


BTW: there is almost no difference between your way and the autotools 
integration that Jeff described. The only difference is that the autotools 
integration first checks for pkg-config, then for sigC++, then for the 
appropriate version (btw: 2.06 == 2.6 in version numbers, ITYM 2.0.6) and 
defines some macros to the pkg-conf output so you don't call it over and over 
again.

cheers

Uli