Re: [Plib-users] Can't find Glut

[Steve B. <sjb...@ai...>]

Sid Owen wrote:

> When I configure Plib-1.6.0, I get an error message saying it can't find
> a working Glut library.

Yep - that's what it says.

> I have looked in the config.log file but that is like gobbledygook to
> me.

Well, what configure does is to write a small C program that uses
one specific function from the library it's testing for - then compiles
it and see whether there were errors.

So, in the check for glut:

> configure: failed program was:

This is the program it wrote:

> #line 2801 "configure"
> #include "confdefs.h"
> /* Override any gcc2 internal prototype to avoid an error.  */
> /* We use char because int might match the return type of a gcc2
>     builtin and then its argument prototype would still apply.  */
> char glutGetModifiers();
> 
> int main() {
> glutGetModifiers()
> ; return 0; }

It's a simple program that calls glutGetModifiers - if it doesn't
compile, that can only be because there is something wrong either
with FINDING libglut - or LINKING to libglut.

Let's see what happened:

> configure:2841: checking for glutGetModifiers in -lglut

OK - so here is the command it uses for compiling the test code:

> configure:2860: gcc -o conftest -g -O2  -I/usr/lib/include 
> -L/usr/lib/lib  -L/usr/X11R6/lib conftest.c -lglut  -lGLU -lGL   -lSM
> -lICE -lXi -lXmu -lXext -lX11  -lm 1>&5

...and here are the error messages from GCC:

> /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/../../../libglut.so: undefined
> reference to `glXBindChannelToWindowSGIX'
> /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/../../../libglut.so: undefined
> reference to `glXQueryChannelDeltasSGIX'
> /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/../../../libglut.so: undefined
> reference to `glXChannelRectSyncSGIX'
> /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/../../../libglut.so: undefined
> reference to `glXChannelRectSGIX'
> /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/../../../libglut.so: undefined
> reference to `glXQueryChannelRectSGIX'
> collect2: ld returned 1 exit status

So, it looks like it found an installed version of libglut - but when it
linked it into the test program, there were other undefined symbols:

glXBindChannelToWindowSGIX, glXQueryChannelDeltasSGIX,
glXChannelRectSyncSGIX, glXChannelRectSGIX, glXQueryChannelRectSGIX.

These are GLX symbols that are unique to SGI computers running IRIX!!
They are not supported under Linux at all!?!

So - it *seems* like the libglut that we've got here was compiled with
flags set for running on an SGI/IRIX machine.

I think you need to remove whatever libglut(s) you have on your machine
and re-install GLUT properly.

---------------------------- Steve Baker -------------------------
HomeEmail: <sjb...@ai...>    WorkEmail: <sj...@li...>
HomePage : http://www.sjbaker.org
Projects : http://plib.sf.net    http://tuxaqfh.sf.net
            http://tuxkart.sf.net http://prettypoly.sf.net
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