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Re: Offloading compilers' support libraries
- From: Ilya Verbin <iverbin at gmail dot com>
- To: Thomas Schwinge <thomas at codesourcery dot com>
- Cc: Bernd Schmidt <bernds at codesourcery dot com>, Jakub Jelinek <jakub at redhat dot com>, gcc-patches at gcc dot gnu dot org, Kirill Yukhin <kirill dot yukhin at gmail dot com>
- Date: Fri, 20 Feb 2015 22:48:52 +0300
- Subject: Re: Offloading compilers' support libraries
- Authentication-results: sourceware.org; auth=none
- References: <20150216210812 dot GO1746 at tucnak dot redhat dot com> <20150217133206 dot GA62715 at msticlxl57 dot ims dot intel dot com> <20150217153918 dot GX1746 at tucnak dot redhat dot com> <alpine dot DEB dot 2 dot 10 dot 1502171619550 dot 19294 at digraph dot polyomino dot org dot uk> <20150217164033 dot GY1746 at tucnak dot redhat dot com> <54E5ACCE dot 7080502 at codesourcery dot com> <8761aydt4y dot fsf at schwinge dot name> <54E5D234 dot 9050209 at codesourcery dot com> <873862drj2 dot fsf at schwinge dot name> <20150220150501 dot GB56550 at msticlxl57 dot ims dot intel dot com>
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?