[U-Boot] [RFC] x86: Do no use reparm as it break libgcc linkage

[Mike Frysinger]

On Wednesday 09 November 2011 23:22:34 Graeme Russ wrote:
> On Thu, Nov 10, 2011 at 3:13 PM, Mike Frysinger wrote:
> > i was referring also to throwing away -mregparm=3 ...
> 
> Yes, it does effect the code - It makes it ABI compliant like everyone
> else (except ARM) :) I expect a code size increase (have not measured
> it yet)

ABI compliance only matters at the boundaries.  since u-boot is largely self-
contained, we shouldn't be afraid to break internal ABI.

> As I've stated, I really do not want arbitrary wrapper functions where
> it is not obvious that they need to be updated if new code uses
> previously unused (and unwrapped) libgcc functions (in particular if
> there are new libgcc functions in the future which we can't wrap
> todday anyway)
> 
> Option a) is to remove regparm=3
> Option b) is to use private libgcc
> Option c) is to use wrappers
> 
> If this patch works, I'll look at the code impact and we can discuss
> which option we take :)

for the record, i'm not against a private libgcc.  it just seems to me that 
the wrapper approach proposed by Gabe has the best pro/con ratio.
-mike
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