Offloading compilers' support libraries

[Ilya Verbin]

On Fri, Feb 20, 2015 at 18:05:01 +0300, Ilya Verbin wrote:
> On Thu, Feb 19, 2015 at 13:17:37 +0100, Thomas Schwinge wrote:
> > My asumption is that it is always safe to install non-native (that is
> > cross) GCC installations into the same prefix.  (Which would resolve this
> > problem of clashing file names for target and offloading compilers for
> > good.)
> > 
> > So, the next question is, instead of this special handling, why can't we
> > require the offloading compilers to always be configured as cross
> > compilers?  Or, why is it a requirement that the intelmic offloading
> > compiler is configured as a native compiler?
> 
> If I understand correctly, to build a cross compiler, we need to specify a path
> to the target sysroot, even for x86_64-pc-linux-gnu to x86_64-intelmic-linux-gnu
> cross.  Or is it possible to build a cross compiler without --with-sysroot ?

To be precise, for the cross compiler we need to specify a path to
--with-build-time-tools (rather than --with-sysroot).  The problem is that for
Intel MIC there are no special as/ld/etc.  So, is there an elegant way to build
a cross compiler with host's build time tools?

Thanks,
  -- Ilya