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From: "doko at ubuntu dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/65464] [4.8/4.9 Regression] disabling multilib support for powerpc64le-linux-gnu breaks kernel builds
Date: Thu, 19 Mar 2015 15:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65464

--- Comment #5 from Matthias Klose <doko at ubuntu dot com> ---
> Well, on x86_64 if you build gcc with --disable-multilib you still
> can compile with -m32 (even without a 32-bit user runtime).
> Why should this be different on ppc64le?

$ gcc -m32 -c foo.c
foo.c:1:0: error: -m32 not supported in this configuration

well, it is different, and this doesn't work on 4.8, 4.9 and 5 anymore.