Segfault while building GHC HEAD on Mac OS X 10.7/XCode 4.1

[Johan Tibell]

The build fails with a segfault when building HEAD using GHC 7.2, OS X 10.7,
and XCode 4.1

Any ideas?

tibbe at redwood:ghc (master)$ make
===--- building phase 0
make -r --no-print-directory -f ghc.mk phase=0 phase_0_builds
make[1]: Nothing to be done for `phase_0_builds'.
===--- building phase 1
make -r --no-print-directory -f ghc.mk phase=1 phase_1_builds
make[1]: Nothing to be done for `phase_1_builds'.
===--- building final phase
make -r --no-print-directory -f ghc.mk phase=final all
"inplace/bin/ghc-stage1"   -H64m -O -fasm    -package-name ghc-prim-0.2.0.0
-hide-all-packages -i -ilibraries/ghc-prim/.
-ilibraries/ghc-prim/dist-install/build
-ilibraries/ghc-prim/dist-install/build/autogen
-Ilibraries/ghc-prim/dist-install/build
-Ilibraries/ghc-prim/dist-install/build/autogen -Ilibraries/ghc-prim/.
 -optP-include
-optPlibraries/ghc-prim/dist-install/build/autogen/cabal_macros.h -package
rts-1.0  -package-name ghc-prim -XHaskell98 -XCPP -XMagicHash
-XForeignFunctionInterface -XUnliftedFFITypes -XUnboxedTuples
-XEmptyDataDecls -XNoImplicitPrelude -O -dcore-lint -no-user-package-conf
-rtsopts     -odir libraries/ghc-prim/dist-install/build -hidir
libraries/ghc-prim/dist-install/build -stubdir
libraries/ghc-prim/dist-install/build -hisuf hi -osuf  o -hcsuf hc -c
libraries/ghc-prim/./GHC/Debug.hs -o
libraries/ghc-prim/dist-install/build/GHC/Debug.o
make[1]: *** [libraries/ghc-prim/dist-install/build/GHC/Debug.o]
Segmentation fault: 11
make: *** [all] Error 2
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