#7602: Threaded RTS performing badly on recent OS X (10.8?) ---------------------------------+------------------------------------------ Reporter: simonmar | Owner: Type: bug | Status: new Priority: normal | Milestone: _|_ Component: Runtime System | Version: 7.6.1 Keywords: | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: None/Unknown Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by simonmar): gcc support register variables, which we use instead of `__thread` (see `rts/sm/GCTDecl.h`). So we can use gcc until/unless they drop support for register variables. TLS requires support from the OS, which is why neither gcc nor Clang/LLVM can support it on OS X. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7602#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler