perhaps linux32 helps you out
man linux32
greetings
Juergen
Roger K. Wells wrote:
> We develop software and are beginning a slow transition from 32 bit
> applications
> to their 64 bit equivalents. During this period it will be necessary to
> build
> programs targeted for both environments using the x86-64 machines for
> development.
>
> here is a simple/small "application", sizes.c:
>
> #include <stdio.h>
> #include <stdlib.h>
>
> int main(int argc, char **argv)
> {
> printf("Various sizes:\n");
> printf(" short = %d\n", sizeof(short));
> printf(" int = %d\n", sizeof(int));
> printf(" long = %d\n", sizeof(long));
> printf(" float = %d\n", sizeof(float));
> printf(" double = %d\n", sizeof(double));
> return 0;
> }
>
> if I build it using:
>
> gcc -m32 -Wall -osizes sizes.c
>
> there are no warnings or complaints and a functioning 32 bit
> program runs, giving the size of a long as 4 bytes. (Of course
> without the m32 flag the size of long is 8 bytes.)
>
> if I try to do the equivalent in two steps:
>
> gcc -c -m32 -Wall sizes.c
> gcc -osizes -Wl,-m,elf_i386 sizes.o
>
> the result is:
> /usr/bin/ld: skipping incompatible
> /usr/lib/gcc/x86_64-redhat-linux/4.1.2/libgcc.a when searching for -lgcc
> /usr/bin/ld: skipping incompatible
> /usr/lib/gcc/x86_64-redhat-linux/4.1.2/libgcc.a when searching for -lgcc
> /usr/bin/ld: cannot find -lgcc
> collect2: ld returned 1 exit status
>
> there is some confusion in the man pages as to whether the correct 32
> bit emulation is elf_i386 or i386linux so:
>
> gcc -osizes -Wl,-m,i386linux sizes.o
> gives result:
> /usr/bin/ld: unrecognized option '--eh-frame-hdr'
> /usr/bin/ld: use the --help option for usage information
> collect2: ld returned 1 exit status
>
> since the single line command works it seems that there must be a way to
> get the job done.
> This becomes important when there are many source files and use of a
> traditional
> makefile is involved where compiling and linking are separate steps.
>
> Thanks in advance for reading this,
> roger wells
>