Question

我写了以下文件temp.hs：

import qualified Data.Set
import System.Environment

main :: IO ()
main = do
        args <- getArgs
        let fname = head args
        print (fname)

它加载ghci没有错误：

$ ghci
GHCi, version 6.12.3: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
Prelude> :load temp.hs 
[1 of 1] Compiling Main             ( temp.hs, interpreted )
Ok, modules loaded: Main.
*Main>

当我尝试编译它时，我收到以下错误：

$ ghc temp.hs -o temp
Undefined symbols:
  "___stginit_containerszm0zi3zi0zi0_DataziSet_", referenced from:
      ___stginit_Main_ in temp.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

如果我将导入Data.Set取出，它编译得很好。

版本信息：

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.12.3

$ gcc --ver
Using built-in specs.
Target: i686-apple-darwin10
Configured with: /var/tmp/gcc_40/gcc_40-5494~112/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=i686-apple-darwin10 --with-arch=apple --with-tune=generic --host=i686-apple-darwin10 --target=i686-apple-darwin10
Thread model: posix
gcc version 4.0.1 (Apple Inc. build 5494)

Answer 1

您可以单独添加包（如KennyTM建议的那样），或者您可以使用--make，这在很多方面都更方便：

ghc --make temp.hs -o temp

这将导致GHC以与GHCi完全相同的方式在其安装的软件包中查找任何所需的模块。

Answer 2

ghc -package containers temp.hs -o temp

当您实际使用该库时，您可以检查ghci可能需要哪个包：

  GHCi, version 6.12.3: http://www.haskell.org/ghc/  :? for help
  Loading package ghc-prim ... linking ... done.
  Loading package integer-gmp ... linking ... done.
  Loading package base ... linking ... done.
  Loading package ffi-1.0 ... linking ... done.
  Ok, modules loaded: Main.
  Prelude Main> Data.Set.singleton 0
> Loading package array-0.3.0.1 ... linking ... done.
> Loading package containers-0.3.0.0 ... linking ... done.
  fromList [0]
  Prelude Main>

使用Data.Set的Haskell程序不会编译

2 个答案: