#7062: Spurious undefined reference to `openpty' ---------------------------------+------------------------------------------ Reporter: simonmar | Owner: Type: bug | Status: merge Priority: high | Milestone: 7.4.3 Component: Compiler | Version: 7.4.2 Keywords: | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: None/Unknown Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Changes (by trommler):
* cc: ptrommler@… (added) Comment: I came across the --as-needed issue when preparing packages for openSUSE's Build Service, where it is set by default. The problem is that shared libraries that do not contain symbols that are undefined in any object (library or object file) up to the point in the command line where the library is mentioned (-l) will not be included in the ELF info and especially an Rpath will not be recorded. If the shared library is not installed in a standard directory, and Haskell libraries will not be in most Linux distributions, then it will not be found. If you symlinked those libraries from one of the standard directories then all works fine again. As a temporary fix I put --no-as-needed into ghc's settings in a patch for openSUSE's ghc package. To fix the --as-needed issue properly all libraries need to be linked to before libraries they depend on and for cycles one library needs to be linked twice. For Haskell packages dependency information in the packaging system could be used, for system libraries the the correct linking order would have to be specified in the extra-libraries field. AFAIK Gentoo uses or at least recommends using --as-needed, too. Should we deal with this as a feature request in a different ticket? -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7062#comment:6> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs