Re: POLA.. missing --sysroot option in ld?
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On 01 May 2014, at 15:18, Brooks Davis <brooks@freebsd.org> wrote:
> On Wed, Apr 30, 2014 at 11:02:31PM -0600, Warner Losh wrote:
>>=20
>> On Apr 29, 2014, at 10:23 PM, Julian Elischer <julian@FreeBSD.org> =
wrote:
>>> On 4/30/14, 10:36 AM, Julian Elischer wrote:
>>>> In our 8.0 based systems at $JOB our build environment made heavy =
use of the --sysroot option in gcc and ld.
>>>>=20
>>>> We are trying to move up to a newer release but suddenly the =
--sysroot option has disappeared.
>>>>=20
>>>> we get the message "/usr/bin/ld: this linker was not configured to =
use sysroots"
>>> more spefically the following command (from 'configure') fails on =
"near 9"
>>> and succeeds on 8.0.
>>>=20
>>> configure:3352: /usr/bin/gcc -Wall -Wno-unused-parameter -nostdinc =
-isystem /usr/build/buildroot/tools/x86_gcc4.2.4/usr/include --sysroot =
/usr/build/buildroot/tools/x86_gcc4.2.4 -Wall -Wno-unused-parame
>>> ter -nostdinc -isystem =
/usr/build/buildroot/tools/x86_gcc4.2.4/usr/include --sysroot =
/usr/build/buildroot/tools/x86_gcc4.2.4 --sysroot =
/usr/build/buildroot/tools/x86_gcc4.2.4 -L/usr/build/buildroot/too
>>> ls/x86_gcc4.2.4/lib =
-L/usr/build/buildroot/tools/x86_gcc4.2.4/usr/lib conftest.c >&5
>>>>=20
>>>> Does anyone know what happened? and when, and by who?
>>>> I have looked in the Makefiles and configuration files in SVN and I =
can't see a change that would have done this..
>>>> of course the building of these tools is rather complex so I may =
have missed some place..
>>=20
>> Yea, I looked too and don?t see anything. I thought it was broken in =
more like 2005 not 2011. You?re only hope is to bisect the tree down to =
the change that caused it?
>=20
> It's been broken since at least the last binutils import and probably
> longer since the inane ld behavior of activating --sysroot only when
> built with a specified sysroot is from upstream. The fix is trivial, =
just
> merge r257268 and r257530 to the branch you are using.
Yes, I already had a discussion with Julian on IRC about it, but for the
sake of the mailing list, a summary:
* The change got introduced with the binutils 2.17.50 merge, in r218822
(-CURRENT, at the time).
* Upstream apparently introduced this, "because it was hard to make it
work": see the thread starting at
https://sourceware.org/ml/binutils/2007-02/msg00274.html
* Upstream binutils git master still contains the same logic.
* Brooks's r257268 and r257530 ensures TARGET_SYSTEM_ROOT is always
defined (e.g. to "/" in the regular case), making --sysroot work
correctly.
-Dimitry
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