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