[gentoo-amd64] Curious thing- linking against .so libs...

[Branko Badrljica <brankob@avtomatika.com>]

I was trying to install nVidia's CUDA SDK for toying with GPU as 
computing tool, but I soon found out that I can't compile anything.

I always get error's like "can't find -lGL" etc from compiler. So I took 
a look where LIBPATHetc were set and everything seemed fine.

After that, I tried with trivial "Hello world" test source. I tried to 
compile it, linking it with libGL.so. Compile failed with familiar 
"can't find...".

Then I tried to link it to another libraries I found in /usr/lib64. It 
turns out that gcc wants to link to .a/.la files and completely seems to 
ignore .so.

What gives ?

I have standard Gentoo config on Phenom system with typical desktop 
setup. gcc is v-4.3.2.

Test case program:

#include <stdio.h>

void main ( int argc , char ** argv )   {
        printf("Argc is %d, arg zero is %s and arg one is %s\n" , argc, 
argv[0] , argv[1] );
};


Compile attempts that work fine:

gcc -O2 -m32 -march=barcelona -pipe -o tt tt.c


gcc -O2 -m32 -march=barcelona -pipe -L/usr/lib64 -lresolv -o tt tt.c ( 
resolv lib has .la and .so version )

One that fails:

gcc -O2 -m32 -march=barcelona -pipe -L/usr/lib64 -lgdgeda -o tt tt.c 
(libgdgeda has just .so )


Any ideas ?