[patch, spu] More flexible --with-sysroot to enable "common" PPU/SPU sysroot

[Joseph S. Myers]

On Mon, 17 Nov 2008, Ulrich Weigand wrote:

> I agree that other platforms might not want the hard-coded "/usr" as well.
> However, whether this is the case for any specific platform does appear to
> be an issue that needs to be selected per-platform.
> 
> I'm wondering how else the decision could be made except via the back-end
> defines my patch is setting.  Do you have any suggestions what to use
> instead?  A new configure.tgt setting, maybe?

I think it does need to be back end defines - but potentially for all 
bare-metal targets rather than just one.  There is unfortunately no common 
header shared by all bare-metal targets at present; my stdint.h patch 
(pending review for 4.5) adds a header newlib-stdint.h to what I think are 
all the relevant places, but I think any future bare-metal.h should be 
separate (since probably a few bare-metal targets are not in fact using 
newlib and so should not have a newlib-specific header).  (And your patch 
illustrates that a t-* change is needed at present as well as a header 
change.)

Setting it just for one target is a sensible approach for the present 
development stage.

-- 
Joseph S. Myers
joseph@codesourcery.com