Does this mean I can finally switch back to Lion and expect GHC to work? That's very exciting news! :D
On Jul 25, 2011, at 10:33 AM, David Peixotto wrote: > I think the warnings are not a big concern. I silence both of them by adding > -optl"-Wl,-no_compact_unwind,-no_pie" to my ghc options in /usr/bin/ghc. > > In 10.7 they changed the default linking options to create a PIE (position > independent executable). To create a PIE you have to compile all code as > position independent, which is the default option of GHC on mac os x. For > performance reasons some code is compiled with absolute references (like the > gmp library code in your example) so it cannot be used when creating a PIE. > The advantage of a PIE executable is that it is more secure because the OS > can load it at a random base address. > > I believe the "compact unwind" warning is related to the creation of unwind > frames for error handling with exceptions in languages like C++. There are > some more details in this trac ticket: > http://hackage.haskell.org/trac/ghc/ticket/5019. I'm not sure what the > advantage of the compact unwind is, but it sounds like it could make the > executable smaller. > > -David > > On Jul 25, 2011, at 7:59 AM, Luca Ciciriello wrote: > >> Hi All. >> I've installed on my Mac the new MacOS X 10.7 (Lion) with Xcode 4.1 >> >> Using ghc 7.0.4 (64-bit) on that system a get the following warnings in the >> linking phase: >> >> Linking hslint ... >> ld: warning: could not create compact unwind for _ffi_call_unix64: does not >> use RBP or RSP based frame >> ld: warning: PIE disabled. Absolute addressing (perhaps -mdynamic-no-pic) >> not allowed in code signed PIE, but used in ___gmpn_modexact_1c_odd from >> /Library/Frameworks/GHC.framework/Versions/7.0.4-x86_64/usr/lib/ghc-7.0.4/integer-gmp-0.2.0.3/libHSinteger-gmp-0.2.0.3.a(mode1o.o). >> To fix this warning, don't compile with -mdynamic-no-pic or link with >> -Wl,-no_pie >> >> Is this something to worrying about? >> >> Thanks in advance for any answer. >> >> Luca >> _______________________________________________ >> Glasgow-haskell-users mailing list >> Glasgow-haskell-users@haskell.org >> http://www.haskell.org/mailman/listinfo/glasgow-haskell-users >> > > > _______________________________________________ > Glasgow-haskell-users mailing list > Glasgow-haskell-users@haskell.org > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users Jack Henahan jhena...@uvm.edu == Computer science is no more about computers than astronomy is about telescopes. -- Edsger Dijkstra ==
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