Re: add etc/PROBLEMS entry for building 32-bit exe on 64-bit system

[Stefan Monnier]

>> I for one have compiled Emacs in 32bit-mode on an amd64 machine in two
>> difference circumstances:

> How about sharing the experience: how did you configure and build to
> get a 32bit binaries?

On my work machine it was a while back and I can't remember doing much: it
seemed to just work.  But I probably had to muck around with something,
I just can't remember it, probably because it was fairly obvious.

On my home machine I reported my problems here at the time and basically
fixed them for this one time by adding 

   #ifndef _LP64
   /* It's actually running in x86 compatibility mode. */
   #include "m/intel386.h"
   #else

to src/m/amdx86-64.h and a few other quick&dirt hacks.
Luckily my system is pure 32bit (other than the kernel) so I didn't have to
deal with issues such as /usr/lib64/crtn.o.


        Stefan


PS: IMHO we shouldn't need to specify --build=i386-linux-gnu.  Instead,
passing CC="gcc -m32" should be sufficient.