Documentation on how to build 32bit applications on amd64?

[Anonymous]

Yuri <yuri at rawbw.com> writes:

> I need to build 32 bit apps the same way as they would be built on i386.
>
> When I run 64-bit gcc I get this:
> gcc -m32 -o m m.c
> /usr/bin/ld: skipping incompatible /usr/lib/libgcc.a when searching
> for -lgcc
> /usr/bin/ld: skipping incompatible /usr/lib/libgcc.a when searching
> for -lgcc
> /usr/bin/ld: cannot find -lgcc
>
> When I run 32bit gcc I get this:
> /gcc-4.5.0-32/bin/gcc -m32 -o m m.c
> /var/tmp//ccif89DB.s: Assembler messages:
> /var/tmp//ccif89DB.s:11: Error: suffix or operands invalid for `push'
> /var/tmp//ccif89DB.s:14: Error: `-12(%ebp)' is not a valid 64 bit
> base/index expression
>
> In first case libgcc.so isn't found, and specifying -L/usr/lib32
> doesn't help.
> In the second case 32bit compiler runs 64-bit assembler which is wrong.
>

This was already discussed several times. I only remember recent
threads[1][2].

I've built a few ports with not many dependencies but stumbled on
unrelated issues before ever trying smth like emulators/wine.

[1] http://docs.freebsd.org/cgi/mid.cgi?201007291718.12687.tijl
[2] http://docs.freebsd.org/cgi/mid.cgi?86tyobk6bu.fsf
    ftp://ftp.lissyara.su/users/Guest/cc32wrapper (improved wrapper)

> Is there a documentation how to cross compile 32 bit apps on 64 bit
> platform?

The only documented way is by using 32bit chroot.