在Windows上将c ++ dll与Haskell-Platform链接起来，输出'未定义参考' [英] Linking c++ dll with Haskell-Platform on Windows, outputs 'undefined reference'

问题描述

我是一名Haskell爱好者，在Windows上编译我的小Haskell程序时遇到困难。我的程序使用 iconv 软件包，该软件包反过来使用用c / c ++编写的外文库。为了使事情有效，我有：

• 运行 GNU-Iconv 安装程序，并将
  'libiconv-2.dll'和'libiconv2.dll'的'bin'文件夹添加到
变量。


• 提取并复制'LibIconv开发者文件'到
  Haskell平台位置的'mingw'文件夹中。


• 然后'cabal install iconv'编译并安装了cabal软件包
  。

现在，当我尝试在Leksah中构建我的模块时，我收到'GHC'的以下消息：

  Building norms-parser-0.0.1 ... 
链接dist\build\\\
orms-parser\\\
orms-parser.exe ... 
 C：\Documents and Settings\kdv\应用程序数据\cabal\iconv-0.4.1.0\ghc-7.0.4 / libHSiconv-0.4.1.0.a（hsiconv.o）：hsiconv.c :(。text + 0x7）：未定义的引用_imp__libiconv_open 
 C：\ Documents and Settings \kdv\Application Data\cabal\iconv-0.4.1.0\ghc-7.0.4 / libHSiconv-0.4.1.0.a（hsiconv.o）：hsiconv.c :( .text + 0x17）：未定义引用'_imp__libiconv'
 C：\ Documents and Settings \kdv\Application Data\cabal\iconv-0.4.1.0\ghc-7.0.4 / libHSiconv- 0.4.1.0.a（hsiconv.o）：hsiconv.c :(。text + 0x27）：对`_imp__libiconv_close'的未定义引用
 collect2：ld返回1退出状态
  
 
 
 
使用'GHCi'，我也面临一个问题： 
 
 
  ghc.exe：无法加载软件包`iconv-0.4.1.0'
 ghc.exe：C：\Documents and Settings\kdv\Application Data\cabal\iconv-0.4.1.0 \ghc- 7.0.4\HSiconv-0.4.1.0.o：未知符号`__imp__libiconv_open'
  
我认为可能的解决方案是将c / c ++头文件正确设置为'mingw'文件夹并将PATH变量设置为'lib'文件，但是我点亮了有关它的知识，所以任何帮助将非常感谢。
解决方案
在Windows上安装libiconv有点棘手。 > 
 
 
 
 
从二进制和开发者文件 .sourceforge.net / packages / libiconv.htmrel =nofollow>它位于此处  
 
将这两个软件包解压缩到位于Haskell Platform文件夹内的mingw文件夹中。 
 
 
下载Iconv的cabal软件包目前的最新版本 
 
 
 
编辑iconv.cabal文件，所以包含 include-dirs 和 extra-lib-dirs 看起来像
  include-dirs：cbits，C：\ \HaskellPlatform\\\2013.2.0.0\\\\\\\\\\\\\\\包括
 extra-lib-dirs：C：\\HaskellPlatform\\\2013.2.0.0\\ mingw\\ lib
  
 
 
 
注意在Windows路径中的双破折号，并编辑它到你的Haskell平台的路径。
 
 
编辑iconv.cabal文件，有一行如果os（达尔文）|| os（freebsd），将其更改为 if os（darwin）|| os（freebsd）|| os（windows） 
 
 
就是这样，现在你可以在iconv中运行 cabal install 命令pachage dir 
 
 
 
I am a Haskell enthusiast and have got stuck upon compiling my little Haskell program on Windows. My program uses the iconv package, which in turn uses the foreign library written in c/c++. To  make things work I have :



Run GNU-Iconv setup and added its 'bin' folder, where
'libiconv-2.dll' and 'libiconv2.dll' are located,  to  the PATH
variable.
Extracted and copied 'LibIconv developer files' to the 'mingw' folder of
Haskell Platform location.
Then 'cabal install iconv' compiles and I have the cabal package
installed.


Now, when I try to build my module in Leksah, I get the following message from 'GHC':
Building norms-parser-0.0.1...
Linking dist\build\norms-parser\norms-parser.exe ...
C:\Documents and Settings\kdv\Application Data\cabal\iconv-0.4.1.0\ghc-7.0.4/libHSiconv-0.4.1.0.a(hsiconv.o):hsiconv.c:(.text+0x7): undefined reference to `_imp__libiconv_open'
C:\Documents and Settings\kdv\Application Data\cabal\iconv-0.4.1.0\ghc-7.0.4/libHSiconv-0.4.1.0.a(hsiconv.o):hsiconv.c:(.text+0x17): undefined reference to `_imp__libiconv'
C:\Documents and Settings\kdv\Application Data\cabal\iconv-0.4.1.0\ghc-7.0.4/libHSiconv-0.4.1.0.a(hsiconv.o):hsiconv.c:(.text+0x27): undefined reference to `_imp__libiconv_close'
collect2: ld returned 1 exit status
With 'GHCi',I face an issue too:
ghc.exe: unable to load package `iconv-0.4.1.0'
ghc.exe: C:\Documents and Settings\kdv\Application Data\cabal\iconv-0.4.1.0\ghc-    7.0.4\HSiconv-0.4.1.0.o: unknown symbol `__imp__libiconv_open'
I think the probable  solution  is in having the right setup of c/c++ header files to 'mingw' folder and setting PATH variables to 'lib' files, but I have little knowledge about it, so any help will be much appreciated.
解决方案
Installing libiconv is a little tricky on Windows.

Download libiconv binary and developer files from it site here
Unzip both packages over mingw folder, which is inside your Haskell Platform folder.
Download cabal package for Iconv latest version for the moment
Edit iconv.cabal file, so lines with include-dirs and extra-lib-dirs will looks like
include-dirs:    cbits, "C:\\HaskellPlatform\\2013.2.0.0\\mingw\\include"
extra-lib-dirs:  "C:\\HaskellPlatform\\2013.2.0.0\\mingw\\lib"

notice the double dashes in windows path, and edit it to your path of Haskell Platform.

Edit iconv.cabal file, there is a line with if os(darwin) || os(freebsd), change it to if os(darwin) || os(freebsd) || os(windows)
Thats it, now you can run cabal install command from iconv pachage dir


                        
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