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Date: Fri, 29 Jun 2007 19:31:16 +1000
From: Paul Mackerras <paulus@samba.org>
To: Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: Please pull from 'for_paulus' branch
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Cc: linuxppc-dev@ozlabs.org, Arnd Bergmann <arnd@arndb.de>
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Segher Boessenkool writes:

> It is not.  -mcpu=powerpc64 doesn't select an ABI, and your
> GCC presumably defaults to the 32-bit ABI.  Use -m64 on the
> GCC command line, too, you need it, and it solves this issue
> as a side effect.

No, actually the command line had -m64 on it.  The situation is this:

gcc -m64 -mtune=power4 works
gcc -m64 -mcpu=powerpc64 -mtune=power4 fails.

The problem is in the spec file where it works out what parameters to
pass to `as'.  Without any -mcpu it correctly defaults to passing
-mppc64 (when -m64 is given).  It then also has a list of -mcpu values
and the corresponding flag to pass to as, but powerpc64 isn't in that
list.  Thus with -mcpu=powerpc64 we don't get -mppc64 passed to as.

Paul.