linux-kernel - Re: X32 psABI status update

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Message-Id: <201103160124.42939.vapier@gentoo.org>
Date:	Wed, 16 Mar 2011 01:24:41 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	"H.J. Lu" <hjl.tools@...il.com>
Cc:	libc-alpha@...rceware.org, GCC Development <gcc@....gnu.org>,
	LKML <linux-kernel@...r.kernel.org>, x32-abi@...glegroups.com
Subject: Re: X32 psABI status update

On Wednesday, March 16, 2011 00:51:37 H.J. Lu wrote:
> On Tue, Mar 15, 2011 at 9:30 PM, Mike Frysinger <vapier@...too.org> wrote:
> > On Wednesday, March 16, 2011 00:17:04 H.J. Lu wrote:
> >> On Mon, Mar 7, 2011 at 1:33 PM, Mike Frysinger wrote:
> >> > On Saturday, March 05, 2011 14:08:04 H.J. Lu wrote:
> >> >> Many x32 bugs are fixed in kernel, glibc, binutils and GCC:
> >> >> 
> >> >> https://sites.google.com/site/x32abi/
> >> >> 
> >> >> The major remaining issues are glibc/gcc testsuite failures,
> >> >> kernel core dump and signal handler unwind.
> >> > 
> >> > are you getting a unique host tuple for this ?  or are you extending
> >> > x86_64- linux-gnu ?  so the only way of knowing which ABI is to check
> >> > for the output of the compiler+compiler flags ?
> >> 
> >> x32 requires x32 enabled x86-64 kernel.
> > 
> > ok, but that doesnt answer my question.  what are you passing to --target
> > ?
> 
> See:
> 
> https://sites.google.com/site/x32abi/
> 
> You configure it as
> 
> CC="gcc -mx32" ...../configure x86_64- linux-gnu

that isnt what the page says.  it does say for glibc to do:
	CC="x32-gcc -mx32 " CXX="x32-g++ -mx32 " CFLAGS="-O2 -g"  ../configure

but it doesnt say what to do for binutils or gcc itself.  obviously you cant 
use the -mx32 flag when building the cross gcc for the first time since the 
current native gcc wont support it.

the invocation given for glibc implies that the proposed tuple is x32-linux-
gnu, but the GNU config project doesnt support that tuple and i didnt see 
mention of it in the binutils or gcc sources.

so we get back to my original e-mail:
	are you getting a unique host tuple for this ?  or are you extending
	x86_64-linux-gnu ?  so the only way of knowing which ABI is to check for
	the output of the compiler+compiler flags ?
-mike

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