Re: [GHC] #8902: Test for RTLD_NEXT, RTLD_DEFAULT broken on Linux

#8902: Test for RTLD_NEXT, RTLD_DEFAULT broken on Linux -----------------------------------+------------------------------------ Reporter: trommler | Owner: Type: bug | Status: closed Priority: low | Milestone: Component: libraries/unix | Version: 7.8.1-rc2 Resolution: invalid | Keywords: Operating System: Linux | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -----------------------------------+------------------------------------ Changes (by thomie): * status: new => closed * resolution: => invalid Comment: The current behavior is correct. From [http://www.polarhome.com/service/man/generic.php?qf=dlsym&type=2&of=OpenSuSE&sf=3 man dlsym]: "The symbols RTLD_DEFAULT and RTLD_NEXT are defined by only when _GNU_SOURCE was defined before including it." From System/Posix/DynamicLinker/Prim.hsc: -- On some host (e.g. SuSe Linux 7.2) RTLD_NEXT is not visible -- without setting _GNU_SOURCE. Since we don't want to set this -- flag, here's a different solution: You can use the Haskell -- function 'haveRtldNext' to check wether the flag is available -- to you. Ideally, this will be optimized by the compiler so -- that it should be as efficient as an #ifdef. -- If you fail to test the flag and use it although it is -- undefined, 'packOneModuleFlag' will bomb. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8902#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler