Re: [Opengrads-devel] Fwd: Opengrads bundle 2.0.a9 being uploaded

[Jennifer A. <jm...@co...>]

Thanks for the comments. This is NOT my area of expertise, and I  
welcome your guidance. Clearly, the dynamic linking against system  
installations is the easiest, but for the binary distributions, I will  
have to figure out how to link statically. That long list of dependent  
libraries is daunting! In my simple test program (rmf.c), I am  
compiling/linking with this command:

gcc -g rmf.c -o rmf -I/opt/local/include/cairo -L/opt/local/lib - 
lcairo -L/usr/X11/lib -lX11

I have some more testing to do with fonts, and so I may have to add  
some more libs to that list, but if my code doesn't require all those  
dependent libs, I don't have to statically link them, do I?

As for backends, I am planning to use cairo to draw to an X window,  
PNG, Postscript, PDF, and SVG. I do not see why it's necessary to add  
the platform-specific window backends; X has been working fine for  
GrADS all these years.
--Jennifer


On Oct 5, 2010, at 10:03 AM, Arlindo da Silva wrote:

>
>
> On Tue, Oct 5, 2010 at 5:16 AM, Patrice Dumas <per...@fr...>  
> wrote:
> On Mon, Oct 04, 2010 at 04:40:17PM -0400, Jennifer Adams wrote:
> > >
> > >Regarding the supplibs, I have been working on the switch to cairo
> > >for graphics rendering. At the moment, I am only working in the
> > >mac environment, using the macports installation of cairo, so I
> > >don't really know what the issues are regarding building from
> > >source, or for the autoconfiguration. If any of you can provide
> > >some guidance, especially for the autoconf stuff, it would be most
> > >welcome. There must be some existing code out there that does
> > >this, maybe already in opengrads, but I haven't looked for it yet.
>
> cairo uses pkgconfig.  So something like
>
>  cairo_pkgconfig=yes
>  PKG_CHECK_MODULES([CAIRO],[cairo >= $cairo_min_version],,
>    [cairo_pkgconfig=no])
>
> should set CAIRO_LIBS and CAIRO_CFLAGS.  This should be enough for
> linking dynamically against the system library.
>
>
> The libs it requires when statically linking should be listed in
> Requires.private:. To link statically against the supplibs, I guess  
> that
> you have 2 options.  Either simply supply the right link flags and
> include dirs, either hardcoded or using GA_SET_FLAGS and similar.  Or
> put the .pc files obtained when compiling supplibs in a specific
> directory in the supplibs, set PKG_CONFIG_PATH to this directory, and
> use a pkg-config call, like
>  pkg-config --static cairo --libs
>
> I don't know if you'd want to put pkg-config in the supplibs too,  
> then,
> but, in case you wonder, on my debian squeeze box, pkg-config links  
> against
> glib, which in turns requires libpcre, and no other dependency  
> (besides
> a C library) seems to be involved.
>
>
> (Cairo, however needs quite a bit of depednecies, but it is not  
> clear to me
> how you want to handle the backends of cairo?  On my box, the xcb  
> backend
> is used:
>
> pkg-config --static cairo --libs
> -lcairo -lpixman-1 -lfontconfig -lexpat -lfreetype -lpng12 -lz -lm - 
> lxcb-render-util -lXrender -lxcb-render -lX11 -lpthread -lxcb -lXau - 
> lXdmcp
>
> But I guess that on MacOSX the Quartz backend should be used, on  
> Windows
> the win32 backend, on other UNIX the xlib backend?)
>
>
> Nice to hear form you!
>
> The opengrads supplibs includes pkg-config and builds  (whenever  
> possible) builds all packages with it. The main reason being this  
> autoconf integration.
>
> As for my experience building cairo in the supplibs. This is the  
> only library that I have *not* succeeded to build statically on all  
> platforms. Not quite sure what the issues are. Since the opengrads  
> wrappers automatically sets LD_LIBRARY_PATH, this have not been a  
> problem. So far I have used cairo primarily for gxyat with only 4  
> backends: PNG, SVG, ps and pdf. I disable everything else to avoid  
> any unnecessary dependency.
>
>  Jennifer: which back ends do you intend to use?
>
>    Arlindo
>
> -- 
> Arlindo da Silva
> da...@al...
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jm...@co...