how to use 4.0.6 & 4.2.0 simultaneously

[Randy Chung]

Brian J. Tarricone wrote:
>>>i suppose it _is_ possible to install them both,
>>>but that probably involves hacking a good number of the makefiles
>>>and possibly the .pc files to make sure that the library search path
>>>is specified in a certain way on the gcc link lines.
>>
>>apparently that's not necessary, as the above shows.
> 
> 
> it's necessary in some cases - anecdotal evidence shows that sometimes it
> works, and sometimes it doesn't.  i'm not willing to support it with this
> kind of track record.  i believe randy did some work on the build system,
> but i don't know what came of that.

I'm still semi-working on it, though to be honest my experience with 
Makefiles is limited so I've been reading up on them along the way. 
There's a bit of peculiar behavior where the -L portion of LD_FLAGS is 
being read in correctly, but the -R part is ignored...I'm not quite sure 
why this is happening, and I'm still investigating it.

One thing I've noticed is that in the autogenerated Makefiles, you get a 
line that looks like this (sorry for the weird wrapping):

xfcalendar_LDADD = \
         -Wl,--export-dynamic -L/usr/X11R6/lib -L/usr/local/lib 
-lxfcegui4 -lgtk-x11-2.0 -lxfce4util -lgdk-x11-2.0 -latk-1.0 
-lgdk_pixbuf-2.0 -lm -lpangoxft-1.0 -lpangox-1.0 -lpango-1.0 
-lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0 
                \
         -Wl,-R/usr/lib -ldbh -lm 
                  \
         -L/usr/X11R6/lib -L/usr/local/lib -lxfce4mcs-client -lxfce4util 
-lglib-2.0

...which ends up creating a binary which links against the 
currently-installed libraries in /usr/lib (see the -R/usr/lib line 
there).  The curious thing is, if I remove the "-Wl" flag before the 
-R/usr/lib part, everything links together correctly, like so:

xfcalendar_LDADD = \
         -Wl,--export-dynamic -L/usr/X11R6/lib -L/usr/local/lib 
-lxfcegui4 -lgtk-x11-2.0 -lxfce4util -lgdk-x11-2.0 -latk-1.0 
-lgdk_pixbuf-2.0 -lm -lpangoxft-1.0 -lpangox-1.0 -lpango-1.0 
-lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0 
                \
         -R/usr/lib -ldbh -lm 
              \
         -L/usr/X11R6/lib -L/usr/local/lib -lxfce4mcs-client -lxfce4util 
-lglib-2.0

...note how the -R/usr/lib line is no longer passed to the linker 
directly.  I'm not sure why this happens; maybe somebody with more 
experience with the linker will pipe up.  What would be the 
repurcussions of simply removing the -Wl part entirely?  It seems there 
might be some peculiarities with the way my LDFLAG variable is getting 
read as well, since when I put a -Wl,$(LDFLAGS) before the /usr/lib part 
only the -L part of my LDFLAGS is read (where LDFLAGS="-L/usr/local/lib 
-R/usr/local/lib").

Alternatively, we can bypass this issue entirely by simply having 
distros install to separate directories and setting the necessary 
environment variables to make life happy :P

Benny also has a solution of sorts, where you can move the Xfce 
libraries out of /usr/lib while installing, and then move them back 
afterwards (assuming 4.2 is going to a different directory).  I'm not 
sure how comfortable I am about moving libraries around, but that's 
another way about it.

> 	-brian
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--

Randy