#15338: ghc-pkg misbehaves after possible miscompilation on m68k and sh4 -------------------------------------+------------------------------------- Reporter: glaubitz | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Keywords: | Operating System: Linux Architecture: m68k | Type of failure: Incorrect result | at runtime Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- We have observed in Debian that GHC can produce a erratically behaving version of ghc-pkg which causes issues when piping it's output to another program. Example: {{{ make_setup_recipe Running ghc --make Setup.hs -o debian/hlibrary.setup [1 of 1] Compiling Main ( Setup.hs, Setup.o ) Linking debian/hlibrary.setup ... . /usr/share/haskell-devscripts/Dh_Haskell.sh && \ configure_recipe Running debian/hlibrary.setup configure --ghc -v2 --package- db=/var/lib/ghc/package.conf.d --prefix=/usr --libdir=/usr/lib/haskell- packages/ghc/lib --libexecdir=/usr/lib --builddir=dist-ghc --ghc-option =-optl-Wl\,-z\,relro --haddockdir=/usr/lib/ghc-doc/haddock/base-prelude-/ --datasubdir=base-prelude --htmldir=/usr/share/doc/libghc-base-prelude- doc/html/ --enable-library-profiling Configuring base-prelude-1.2.1... Warning: cannot determine version of /usr/bin/ghc-pkg : "" hlibrary.setup: The program 'ghc-pkg' is required but the version of /usr/bin/ghc-pkg could not be determined. }}} (Full log: https://buildd.debian.org/status/fetch.php?pkg=haskell-base- prelude&arch=m68k&ver=1.2.1-1&stamp=1530588494&raw=0) Examining the behavior of the affected ghc-pkg binary on m68k shows what's going on: {{{ root@pacman:~# uname -a Linux pacman 4.16.0-2-m68k #1 Debian 4.16.16-1 (2018-06-19) m68k GNU/Linux root@pacman:~# ghc-pkg --version GHC package manager version 8.2.2 root@pacman:~# ghc-pkg --version | cat root@pacman:~# }}} Comparing that to an x86_64 machine shows that piping to cat should actually output something: {{{ glaubitz@epyc:~$ uname -a Linux epyc 4.16.0-2-amd64 #1 SMP Debian 4.16.12-1 (2018-05-27) x86_64 GNU/Linux glaubitz@epyc:~$ ghc --version The Glorious Glasgow Haskell Compilation System, version 8.2.2 glaubitz@epyc:~$ ghc --version | cat The Glorious Glasgow Haskell Compilation System, version 8.2.2 glaubitz@epyc:~$ }}} Further investigation shows that the problem is partially resolved when building GHC with reduced optimization: {{{ echo "SRC_HC_OPTS += -O0 -H64m" >> mk/build.mk echo "GhcStage1HcOpts = -O" >> mk/build.mk echo "GhcStage2HcOpts = -O0" >> mk/build.mk echo "GhcLibHcOpts = -O" >> mk/build.mk }}} The above issue goes away, but ghc-pkg itself still shows some strange behavior: {{{ make_setup_recipe Running ghc --make Setup.hs -o debian/hlibrary.setup [1 of 1] Compiling Main ( Setup.hs, Setup.o ) Linking debian/hlibrary.setup ... . /usr/share/haskell-devscripts/Dh_Haskell.sh && \ configure_recipe Running debian/hlibrary.setup configure --ghc -v2 --package- db=/var/lib/ghc/package.conf.d --prefix=/usr --libdir=/usr/lib/haskell- packages/ghc/lib --libexecdir=/usr/lib --builddir=dist-ghc --ghc-option =-optl-Wl\,-z\,relro --haddockdir=/usr/lib/ghc-doc/haddock/microlens- ghc-0.4.8.0/ --datasubdir=microlens-ghc --htmldir=/usr/share/doc/libghc- microlens-ghc-doc/html/ --enable-library-profiling Configuring microlens-ghc-0.4.8.0... hlibrary.setup: ghc-pkg dump failed: dieVerbatim: user error (hlibrary.setup: '/usr/bin/ghc-pkg' exited with an error: ghc-pkg: <stdout>: commitBuffer: invalid argument (invalid character) ) }}} (Full log: https://buildd.debian.org/status/fetch.php?pkg=haskell- microlens-ghc&arch=m68k&ver=0.4.8.0-2&stamp=1529960552&raw=0) To reproduce the issue, GHC can be tested using QEMU which has pretty good support for the m68k target these days. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15338 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler