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bug#16304: Upcoming clang-3.4 apparently miscompiles coreutils.
From: |
Markus Trippelsdorf |
Subject: |
bug#16304: Upcoming clang-3.4 apparently miscompiles coreutils. |
Date: |
Mon, 30 Dec 2013 22:47:05 +0100 |
On 2013.12.30 at 18:47 +0000, Pádraig Brady wrote:
> On 12/30/2013 12:32 PM, Markus Trippelsdorf wrote:
> > coreutils-8.22 build with clang-3.4 doesn't copy permissions correctly:
> >
> > address@hidden tmp % touch test1
> > address@hidden tmp % chmod 600 test1
> > address@hidden tmp % ls -al test1
> > -rw------- 1 markus markus 0 Dec 30 13:25 test1
> > address@hidden tmp % /var/tmp/coreutils-8.22/src/cp test1 test2
> > address@hidden tmp % ls -al test2
> > ---------- 1 markus markus 0 Dec 30 13:25 test2
> > address@hidden tmp %
>
> Ouch.
>
> Note as part of the 8.22 release process
> I did verify that `make check` passed with
> clang-3.3-3.fc20.x86_64
>
> I've again verified that clang-3.3 passes your test above.
>
> Can you pinpoint the erroneous code?
> It does seem like a clang regression TBH.
Started with LLVM r192750 (Enable MI Sched for x86).
I've opened a LLVM bug here:
http://llvm.org/bugs/show_bug.cgi?id=18346
(I will try to come up with a testcase after the holidays)
--
Markus