Compiling/generate 32-bit version of a program on x86-64

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Hello,
My platform is AMD-64 running Fedora 4 64-bit version. Is there a way for me 
to compile and generate 32-bit version of a program ( in C )? How does one do 
that using GCC ? Since 64-bit version also install all the 32-bit 
compatibility library, that should not be a problem, is it ? 

One of the reasons I want to do this because I have an object file ( .o ) that 
I need to link againts, but the object file is in 32-bit, and I don't have 
the source to regenerate the object file. During linking, ld generates 
warning :
/usr/bin/ld: warning: i386 architecture of input file `api/render.o' is 
incompatible with i386:x86-64 output

and the program will segfaults if run, which does not happen if I compiled the 
program in 32-bit machine. But since my working desktop is 64-bit, I am 
wondering if there's a way for me to do it without having to look for 32-bit 
machine.

Thanks for any help.
RDB
-- 
Reuben D. Budiardja
Dept. Physics and Astronomy
University of Tennessee, Knoxville, TN


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