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

[Joseph S. Myers]

On Fri, 14 Nov 2008, Ulrich Weigand wrote:

> I'd like to take this issue up again and propose a modified version of
> the patch.  This version changes the SPU back-end to simply define
> the "native" install paths as "/include" and "/lib" -- just like the
> GNU target does, for example.

I don't think this is back-end-specific; I think such paths are 
appropriate for all bare-metal targets where there isn't really a "native" 
install.  There's another use case for configuring such targets with 
sysroots: if the path where you are installing parts of the (relocatable) 
toolchain during building is a temporary path different from the 
configured prefix, you can get a sysrooted compiler to find headers and 
libraries in that temporary path using --with-build-sysroot, but there's 
no equivalent option for non-sysroot configurations, and right now using a 
sysroot configuration requires a usr -> . symlink while building the 
toolchain.

-- 
Joseph S. Myers
joseph@codesourcery.com