ghc

问题 http://www.vex.net/~trebla/haskell/so.xhtml describes how to compile shared library. About compiling command: ghc -O2 -dynamic -shared -fPIC -o libEval.so Eval.hs hsbracket.c -lHSrts-ghc7.6.3 it says: (Could you omit -dynamic to request static libraries of other packages? Not really, they were not generated with -fPIC. In particular it is illegal on x86_64.) Why is it so? What should one do to compile shared library without libHS* dependencies? 回答1: Since Kaiko contacted me privately for an

问题 I've re-posted this question to focus more tightly on the specific error, and to better enumerate what I've already tried. I'm trying to parse some Haskell code during the runtime of a Haskell program using the hint package. The outer program compiles, but when I run it the inner compilation step fails. I'm getting a description of what I assume is a syntax problem, and a location in the "interactive" code, but I have no idea how to view the code in question. Here's Main.hs module Main where

问题 Basically I have a simple function call, which when used in conjunction with Criterion, results in the memory consumption exploding. Suppose I have the following program : {-# OPTIONS_GHC -fno-cse #-} {-# LANGUAGE BangPatterns #-} module Main where import Criterion.Main import Data.List num :: Int num = 10000000 lst :: a -> [Int] lst _ = [1,2..num] myadd :: Int -> Int -> Int myadd !x !y = let !result = x + y in result mysum = foldl' myadd 0 main :: IO () main = do print $ mysum (lst ()) Then

问题 How does history management work in GHCI or other Haskell-based REPLs? Since Haskell is a pure language, I guess it's implemented using a monad, perhaps the state monad. Kindly note I'm a beginner in Haskell, so please provide a detailed explanation rather than just linking to the source. 回答1: This is a simplified example of how a program might keep a history of commands entered by the user. It basically has the same structure as the number guessing game, so once you understand that you

问题 How does history management work in GHCI or other Haskell-based REPLs? Since Haskell is a pure language, I guess it's implemented using a monad, perhaps the state monad. Kindly note I'm a beginner in Haskell, so please provide a detailed explanation rather than just linking to the source. 回答1: This is a simplified example of how a program might keep a history of commands entered by the user. It basically has the same structure as the number guessing game, so once you understand that you

问题 I don't repeat more than necessary, brief summary: Following the Adder example from this tutorial on a machine with win7 (64) with VS 2010. But I don't use C++ but plain C. When using the cl (MS compiler) with cl /Zi (and no other flag) it works like expected. If not use /Zi and then try to execute the exe goes into flames. Why? (There must be some compiler/link options that make some init in the start of the haskell dll go wrong ) EDIT: Some investigation: /Zi does not affect optimizations.

问题 I don't repeat more than necessary, brief summary: Following the Adder example from this tutorial on a machine with win7 (64) with VS 2010. But I don't use C++ but plain C. When using the cl (MS compiler) with cl /Zi (and no other flag) it works like expected. If not use /Zi and then try to execute the exe goes into flames. Why? (There must be some compiler/link options that make some init in the start of the haskell dll go wrong ) EDIT: Some investigation: /Zi does not affect optimizations.

问题 The bounty expires in 3 days . Answers to this question are eligible for a +50 reputation bounty. ShapeOfMatter wants to draw more attention to this question: “I'm still not sure how to move forward on this.” I'm trying to compile Polysemy monad values at runtime using Hint (Language.Haskell.Interpreter). When I try to do this I reliably get an error about improper use of the : operator in "interactive" code; it seems as if the text hint is passing to GHC has a syntax error in it. {-#

问题 The bounty expires in 3 days . Answers to this question are eligible for a +50 reputation bounty. ShapeOfMatter wants to draw more attention to this question: “I'm still not sure how to move forward on this.” I'm trying to compile Polysemy monad values at runtime using Hint (Language.Haskell.Interpreter). When I try to do this I reliably get an error about improper use of the : operator in "interactive" code; it seems as if the text hint is passing to GHC has a syntax error in it. {-#

问题 I get an error message from GHCi about a "duplicate definition for symbol __module_registered", like this: GHCi runtime linker: fatal error: I found a duplicate definition for symbol __module_registered whilst processing object file /usr/local/lib/ghc-6.2/HSfgl.o How to fix this? 回答1: Thats is easy, probably indicates that when building a library for GHCi (HSfgl.o in the above example), you should use the -x option to ld. 来源： https://stackoverflow.com/questions/3392925/duplicate-definition