GHC 7.10.1 Win7 x86_64 crash when building reflex-dom-0.1.1

[ 4 of 11] Compiling Reflex.Dom.Internal ( src\Reflex\Dom\Internal.hs, dist\build\Reflex\Dom\Internal.o )
ghc.exe: internal error: checkProddableBlock: invalid fixup in runtime linker: 00000000184b3978
    (GHC version 7.10.1 for x86_64_unknown_mingw32)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

This happens with unmodified reflex-dom.cabal (which specifies -funbox-strict-fields and -O2) and also with all ghc-options: flags removed and -O or -O0. When compiling with the bundled mingw it also pops up a GUI error window:

ghc.exe - Entry Point Not Found

The procedure entry point pthread_cond_timedwait_relative_np could not be located in the dynamic link library libwinpthread-1.dll.

I also tried using a fully-updated mingw64 from MSYS2, which has solved -pthread issues for me in the past, but that simply crashes with no additional message.

Verbose cabal output attached.

Trac metadata

Trac field	Value
Version	7.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture