On Dec 30, 2013, at 1:47 PM, Markus Trippelsdorf <[email protected]> wrote:
> 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: >>> >>> markus@x4 tmp % touch test1 >>> markus@x4 tmp % chmod 600 test1 >>> markus@x4 tmp % ls -al test1 >>> -rw------- 1 markus markus 0 Dec 30 13:25 test1 >>> markus@x4 tmp % /var/tmp/coreutils-8.22/src/cp test1 test2 >>> markus@x4 tmp % ls -al test2 >>> ---------- 1 markus markus 0 Dec 30 13:25 test2 >>> markus@x4 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) To determine whether a bug exists in MI scheduler pass (or downstream) you can do this: -mllvm -enable-misched=false. Duncan committed a post-3.4 fix, r197503, for a varargs bug exposed by changes to the SD scheduling policy. -Andy
