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How to generate a cross gcc toolchain that accepts both -m32 and -m64 compiler option?

From: Jimm Chen <chjfth at gmail dot com>
To: crossgcc at sourceware dot org
Date: Thu, 20 Nov 2014 00:47:37 +0800
Subject: How to generate a cross gcc toolchain that accepts both -m32 and -m64 compiler option?
Authentication-results: sourceware.org; auth=none

Using crosstool-ng 1.20, I've managed to build a gcc 4.8.3 cross
compiler on openSUSE 12.3(32-bit) that is targeted at x86_64(x64)
linux. The CT-NG tool is a life saver. However, I have a question. the
generated compiler x86_64-pc-linux-gnu-gcc can only produce x64
executables. When I try to do

  x86_64-pc-linux-gnu-gcc -m32 hello.c

I got error message like:

/home/chj/x-tools/.../sysroot/usr/include/gnu/stubs.h:7:27: fatal
error: gnu/stubs-32.h: No such file or directory
 # include <gnu/stubs-32.h>
                           ^
compilation terminated.

You know, on an openSUSE Linux 64-bit distribution, we can use -m64 to
produce 64-bit image and -m32 to produce 32-bit image. Can someone
tell me how to achieve that functionality with CT-NG generated
toolchain?

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- Re: How to generate a cross gcc toolchain that accepts both -m32 and -m64 compiler option?
  - From: Thomas Petazzoni

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