linux-kernel - Kbuild change breaks the ppc64 build

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Message-ID: <17867.1342.763881.188430@cargo.ozlabs.ibm.com>
Date:	Thu, 8 Feb 2007 22:10:54 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Oleg Verych <olecom@...wer.upol.cz>
CC:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: Kbuild change breaks the ppc64 build

Commit 5de043f4bd11a9e0a3e8daec7d1905da575a76b7 breaks the build on
64-bit powerpc because we no longer get the -m64 flag passed to gcc.
There is code in arch/powerpc/Makefile which adds (or used to add)
-m64 to AS, LD and CC if we are running on a 64-bit machine (which I
am) and have a biarch toolchain (which I do).  Without -m64, the
toolchain assumes 32-bit and all sorts of things break spectacularly.

I haven't yet tracked down exactly why this commit has this effect,
since I find it takes considerable time and effort to understand
Kbuild.

Paul.
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