尝试一个C ++绑定哈斯克尔：让未定义引用错误 [英] Attempting a C++ binding to Haskell: getting undefined reference errors

问题描述

我试图在C ++中哈斯克尔绑定和调用绑定。

I am attempting a C++ binding in Haskell and running into "undefined reference" errors when calling the binding.

我就使一个小项目（ http://github.com/deech/CPlusPlusBindings ）来说明这个问题。它包括一个小的C ++类，C包装，一个C测试脚本和一个Haskell绑定和测试脚​​本。在C测试脚本工作，Haskell的人给我：

I've make a small project (http://github.com/deech/CPlusPlusBindings) to illustrate the problem. It includes a small C++ class, a C wrapper, a C test script and a Haskell binding and a test script. The C test script works, the Haskell one gives me:

  [1 of 1] Compiling Binding          ( dist/build/Binding.hs, dist/build/Binding.o )

  src/Binding.chs:6:26: Warning: Defined but not used: `res'
  In-place registering CPlusPlusBinding-0.1.0.0...
  Preprocessing executable 'binding_test' for CPlusPlusBinding-0.1.0.0...
  [1 of 1] Compiling Main             ( src/BindingTest.hs, dist/build/binding_    /binding_test-tmp/Main.o )

 src/BindingTest.hs:3:1: Warning:
     Top-level binding with no type signature: main :: IO ()
     Linking dist/build/binding_test/binding_test ...
     ../CPlusPlusBinding/c-src/libA_C.a(A_C.o): In function      `A_static_function':

     ../CPlusPlusBinding/c-src/A_C.cpp:4:0:
        undefined reference to `A::static_function()'
     ../CPlusPlusBinding/c-src/libA_C.a(A_C.o): In function `A_member_function':

     ../CPlusPlusBinding/c-src/A_C.cpp:7:0:
        undefined reference to `A::member_function()'
     ../CPlusPlusBinding/c-src/libA_C.a(A_C.o): In function `A_new':

     ../CPlusPlusBinding/c-src/A_C.cpp:10:0:
        undefined reference to `operator new(unsigned long)'
     collect2: error: ld returned 1 exit status

运行小集团配置和阴谋构建将编译C ++和C绑定和重现错误。

Running cabal configure, and cabal build will compile the C++ and C bindings and reproduce the error.

更新

在下面的评论概括我已经解决了这个问题。看来我不能回答我的问题，虽然。

I've solved the problem as outlined in the comment below. It appears I can't answer my own question, though.

推荐答案

社区维基答案以供将来参考。解决的办法是，通过改变小集团文件像这样改变图书馆是psented到链接器$ P $的顺序。

community-wiki answer for future reference. The solution was to change the order the libraries were presented to the linker, by altering the cabal file like so.

include-dirs: ./c-src
ghc-options: -Wall -threaded -lHSCPlusPlusBinding-0.1.0.0 -lA_C -lA -lstdc++

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