On Jul 15, 2008, at 4:34 PM, Søren Hauberg wrote:
man, 14 07 2008 kl. 13:52 -0400, skrev Thomas L. Scofield:
I have been doing some work on imread(). I'm not well-versed in the
compiling/linking process, and have had trouble with this on my Mac.
I have the image-1.0.6 package on my mac and can use it. What I
cannot do is make changes to a file like __magick_read__.cc and then
compile it on the Mac. It's not my changes which are at fault. For
the last few weeks I've been using a linux machine instead, where
I've got things setup correctly (I guess), and I can run something
like
mkoctfile __magick_read__.cc `Magick++-config --cppflags` -
lMagick
++ -lMagick
without an error. (My changes, which involve an effort to move away
from ImageMagick and towards GraphicsMagick, compile, and the routine
is usable on that machine.) But on the Mac I get all kinds of
"undefined symbol" messages from ld (see below).
I've never used a Mac in my entire life so what have to say probably
isn't all that relevant, but hey...
Problems with linking (ld) doesn't have anything to do with the
headers, but with the link flags. You seem to compile with
mkoctfile __magick_read__.cc `GraphicsMagick++-config --
cppflags` -lGraphicsMagick++ -lGraphicsMagick
Here '-lGraphicsMagick++ -lGraphicsMagick' are the link flags. I'd try
with something like
mkoctfile __magick_read__.cc `GraphicsMagick++-config --
cppflags` `GraphicsMagick++-config --libs`
which should give you the right link flags (at least, I think
that's the
idea with the GraphicsMagick++-config script).
Søren
Thank you for the tip. I only had to add to this a "-L libdir"
switch to help it find another library, and it worked fine.
Thomas L. Scofield
--------------------------------------------------------
Associate Professor
Department of Mathematics and Statistics
Calvin College
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