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

[Patrice D. <per...@fr...>]

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?)

-- 
Pat