Re: Problems with linker on Alpha

["Witold Baryluk" <baryluk@smp.if.uj.edu.pl>]

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On 05-02 12:26, Richard Henderson wrote:
> On 04/30/2011 07:25 PM, Michael Cree wrote:
> > First off is bug 12608 [1] which I believe I have identified the
> > problem and have posted a patch to the bug tracker.  I am hoping that
> > if it is acceptable that you can commit it.
> 
> I'll have a look.
> 
> > Secondly, I noted a number of test suite failures in the ld component
> > while building binutils.  Some of them are with plugins which might
> > explain why bugs/crashes seem to randomly appear and disappear with
> > larger software packages using plugins. I would like to investigate
> > the test suite failures but am yet to understand the automated system
> > using expect and isolate each test so that I can run them manually.
> > Are you able to give me a bit of guidance on that?
> 
> "Large number"?  I get
> 
>                 === binutils Summary ===
> 
> # of expected passes            81
> # of unsupported tests          2
> Host   is x86_64-unknown-linux-gnu
> 
>                 === gas Summary ===
> 
> # of expected passes            132
> # of expected failures          1
> # of unsupported tests          1
> Host   is x86_64-unknown-linux-gnu
> 
>                 === ld tests ===
> 
> Running target alpha-qemu
> FAIL: plugin claimfile lost symbol
> FAIL: plugin claimfile replace symbol
> FAIL: plugin claimfile resolve symbol
> XPASS: Preserve default . = 0
> XPASS: Preserve explicit . = 0
> 
>                 === ld Summary ===
> 
> # of expected passes            278
> # of unexpected failures        3
> # of unexpected successes       2
> # of expected failures          7
> 
> That plugin test, as far as I know, isn't system specific and fails
> for all targets.
> 
> > Thirdly, a number of large C++ programs (such as firefox/xulrunner,
> > webkit, libreoffice) bomb out with GPREL16 relocation truncation
> > errors when using the -relax option but link successfully when using
> > --no-relax.  I have reopened bug 5276 [2] which describes this
> > problem.  It would be nice to get this problem fixed!
> 
> Yeah.  Uros just reported this same problem with gcc itself.
> 
> Also, I'm aware of an ld -relax bug that causes the Linux kernel
> to be mis-compiled.  Thankfully at the moment the default is to
> not apply relaxation during the kernel link.
> 
> > Fourthly, the Debian supplied gcc-4.6 fails to build on Debian
> > because of a boostrap comparison failure, so I attempted to build
> > upstream gcc-4.6 branch source which got past the bootstrap
> > comparison but failed later on with the following error:
> > 
> > /usr/bin/ld: BFD (GNU Binutils for Debian) 2.21.51.20110419 internal error, aborting at ../../bfd/elf64-alpha.c line 2064 in elf64_alpha_gc_sweep_hook

I'm now also comiling vanila gcc-4.6.0 on both unstable as well lenny to see if this is a regression
in binutils or other components.

> > 
> > when linking libstdc++.  This is using the Debian supplied bintuils
> > version 2.21.51.20110419-2, also with my patch to fix the TLS issue.
> > Maybe I should make a bug entry for it.
> 
> Yes, please to enter a bug for it.  I hadn't seen this one before,
> possibly because I've been cheating and only building C.
> 
> I've been working on getting QEMU working for alpha-softmmu recently,
> hoping to be able to debug some of the alpha problems that have been
> creeping in "natively".

Hi, thanks into looking into alpha issues.

As of QEMU i must say "Cool!".
I was going to work on qemu-alpha after fixing linker and compiler issue
in current versions. Is there any repository for you work?

Regards,
Witek

-- 
Witold Baryluk

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