#14115: GHC segfaults trying to use TH code when ghc is compiled as DYNAMIC_GHC_PROGRAMS=NO -------------------------------------+------------------------------------- Reporter: pacak | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time Unknown/Multiple | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- When ghc 8.2.1 compiled using DYNAMIC_GHC_PROGRAMS=NO attemps at using TH results in all sorts of exciting errors: source files: {{{ % cat A.hs {-# LANGUAGE TemplateHaskell #-} module Numeric.Sum where import B b }}} this file makes little sense, but it was segfaulting when it had more code as well {{{ % cat B.hs {-# LANGUAGE TemplateHaskellQuotes #-} module B where import Language.Haskell.TH b :: DecsQ b = return [ InstanceD Nothing [] (ConT ''Show `AppT` undefined) [] ] }}} Let's try running it a few times - note illegal hardware instruction {{{ % ghc -O2 A.hs [1 of 2] Compiling B ( B.hs, B.o ) [2 of 2] Compiling Numeric.Sum ( A.hs, A.o ) zsh: segmentation fault ghc -O2 A.hs % ghc -O2 A.hs [2 of 2] Compiling Numeric.Sum ( A.hs, A.o ) zsh: segmentation fault ghc -O2 A.hs % ghc -O2 A.hs [2 of 2] Compiling Numeric.Sum ( A.hs, A.o ) zsh: illegal hardware instruction ghc -O2 A.hs % ghc -O2 A.hs [2 of 2] Compiling Numeric.Sum ( A.hs, A.o ) zsh: segmentation fault ghc -O2 A.hs }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14115 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler