Documentation on how to build 32bit applications on amd64?

[Dan Nelson]

In the last episode (Aug 13), Yuri said:
> 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.
> 
> Is there a documentation how to cross compile 32 bit apps on 64 bit 
> platform?

Try adding -B/usr/lib32 to your first gcc line.  The specs file should be
modified to add this automatically when you pass -m32, imho.

-- 
	Dan Nelson
	dnelson at allantgroup.com