#9348: "Symbol not found" when using a shared library -----------------------------------------+---------------------------- Reporter: alex.davis | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 7.8.3 Resolution: | Keywords: Operating System: MacOS X | Architecture: x86 Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -----------------------------------------+---------------------------- Comment (by alex.davis): Shea Levy figured out the problem and its solution. First of all, its not a problem with R, you get the same error from C. I've attached Shea's C code, which I've titled "errorFromC.c". This code tries to load the Haskell shared library, which it assumes is named "test.dylib", and gives the same error as R. Second, the problem is solved by adding to the compilation the flag "-lHSrts-ghc7.8.3". This links the Haskell runtime system to the resulting file. (although, on my computer I still get errors due to the use if Int instead of CInt in the Haskell code. But the problem of not being able to access the Haskell code at all is solved.) This represents a mismatch between the behavior of the compiler and its documentation. People looking to make shared libraries will read [https://www.haskell.org/ghc/docs/latest/html/users_guide/using-shared- libs.html#idp12506320 section 4.13.3 of the GHC user's guide]. They will see "To build Haskell modules that export a C API into a shared library use the -dynamic, -fPIC and -shared flag". No mention of linking the runtime system. I'm not sure if this a problem with the compiler or the documentation, but either way it should be fixed. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9348#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler