#7049: LLVM backend miscompiles GHC stage2
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Reporter: kgardas | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.5 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Building GHC failed | Testcase:
Blockedby: | Blocking:
Related: |
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Hello,
I've been hunting issue where ghc-stage2 fails with
{{{
"inplace/bin/ghc-stage2" -H32m -O -hide-all-packages -i
-iutils/haddock/src -iutils/haddock/dist/build
-iutils/haddock/dist/build/autogen -Iutils/haddock/dist/build
-Iutils/haddock/dist/build/autogen -optP-DIN_GHC_TREE -optP-include
-optPutils/haddock/dist/build/autogen/cabal_macros.h -package Cabal-1.15.0
-package array-0.3.0.3 -package base-4.6.0.0 -package containers-0.5.0.0
-package directory-1.1.0.1 -package filepath-1.2.0.1 -package
ghc-7.5.20120703 -package pretty-1.1.1.0 -package xhtml-3000.2.0.5
-funbox-strict-fields -O2 -Wall -fwarn-tabs -XHaskell2010 -XCPP
-XDeriveDataTypeable -XScopedTypeVariables -XMagicHash -no-user-package-db
-rtsopts -odir utils/haddock/dist/build -hidir utils/haddock/dist/build
-stubdir utils/haddock/dist/build -hisuf hi -osuf o -hcsuf hc -c
utils/haddock/src/Haddock/GhcUtils.hs -o
utils/haddock/dist/build/Haddock/GhcUtils.o
utils/haddock/src/Haddock/GhcUtils.hs:274:21:
Illegal record syntax (use -XTraditionalRecordSyntax): d {objectDir = Just
f}
make[1]: *** [utils/haddock/dist/build/Haddock/GhcUtils.o] Error 1
}}}
from time to time. It happens on ARM builder:
http://darcs.haskell.org/ghcBuilder/builders/kgardas-linux-arm-head/ since
build 9. Build 8 was OK.
I've been trying to find the precise patch which causes the failure but so
far not successful on this. I just suspect the set of patches which
happens between those two builds on libraries/containers.
Anyway, this is just an issue trigger. The real issue is not on ARM, but
probably in LLVM or LLVM backend as I've been also able yesterday to
duplicate exactly the same issue on my opensolaris/x86 host while
performing perf-llvm build flavor.
This is also probably the reason only ARM builder caught this issue as all
others are using NCG for building GHC stage2 by default.
Last note: this is a regression from 7.4.x branch.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7049>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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