#5352: Very slow (nonterminating?) compilation if libraries compiled with
-fexpose-all-unfoldings
---------------------------------+------------------------------------------
Reporter: batterseapower | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.0.3 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Compile-time performance bug
---------------------------------+------------------------------------------
I built the libraries with -fexpose-all-unfoldings. The stage 1 compiler
then failed to terminate within ~20 minutes on InstalledPackageInfo.hs and
PackageDescription.hs. The memory usage of the compiler did not grow
appreciably (at all?) during this time, which makes me suspect that the
problem is a loop rather than the extra unfoldings leading to code bloat
(somehow).
An example of an offending invocation is:
{{{
"inplace/bin/ghc-stage1" -H64m -O -fasm -package-name Cabal-1.11.2
-hide-all-packages -i -ilibraries/Cabal/cabal/. -ilibraries/Cabal/cabal
/dist-install/build -ilibraries/Cabal/cabal/dist-install/build/autogen
-Ilibraries/Cabal/cabal/dist-install/build -Ilibraries/Cabal/cabal/dist-
install/build/autogen -Ilibraries/Cabal/cabal/. -optP-include
-optPlibraries/Cabal/cabal/dist-install/build/autogen/cabal_macros.h
-package array-0.3.0.3 -package base-4.4.0.0 -package containers-0.4.1.0
-package directory-1.1.0.1 -package filepath-1.2.0.1 -package old-
time-1.0.0.7 -package pretty-1.1.0.0 -package process-1.1.0.0 -package
unix-2.5.0.0 -fwarn-tabs -Wall -fno-ignore-asserts -XHaskell98 -XCPP -O
-dcore-lint -fexpose-all-unfoldings -no-user-package-conf -rtsopts
-odir libraries/Cabal/cabal/dist-install/build -hidir
libraries/Cabal/cabal/dist-install/build -stubdir libraries/Cabal/cabal
/dist-install/build -hisuf hi -osuf o -hcsuf hc -c
libraries/Cabal/cabal/./Distribution/InstalledPackageInfo.hs -o
libraries/Cabal/cabal/dist-
install/build/Distribution/InstalledPackageInfo.o
}}}
The workaround is to build these two files with -O0.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5352>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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