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Re: Powerpc Linux build fails


From: Kumar Gala
Subject: Re: Powerpc Linux build fails
Date: Wed, 19 May 2004 11:23:16 -0500

Is .machine support in binutils-2.15?

- kumar

On May 19, 2004, at 12:10 AM, Alan Modra wrote:

On Tue, May 18, 2004 at 09:27:34PM -0700, Geoff Keating wrote:
I am not sure about this new -mstrict.  I am sure someone is expecting
-mpower3 to really mean 'power3 only' and will get a nasty surprise
when they use a power4 instruction by mistake and their program
crashes.

Probably true.  However, the feedback I'm getting at the moment is that
it's a nasty surprise that the Linux kernel doesn't compile..  The same
goes for current powerpc64 glibc with VMX extensions.

It is perfectly acceptable to say "GAS version X will only work with
GCC version > Y".  People using old GCC can always use old binutils
with it.  (They can also hack their specs file to pass -many, if
that's what they really want.)

The fully-correct way to do this is to have GCC generate a directive
after option parsing, like '.machine 7400' or so, and have GAS
interpret it, otherwise you end up in specs hell.  (Doesn't ppc gas
already have a directive like that?  I seem to remember seeing such a
patch fly by...)

Yes, .machine was implemented 2003-11-22.

--
Alan Modra
IBM OzLabs - Linux Technology Centre





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