Question

我在Haskell中尝试C ++绑定，并在调用绑定时遇到“未定义的引用”错误。

我做了一个小项目（http://github.com/deech/CPlusPlusBindings）来说明问题。它包括一个小的C ++类，一个C包装器，一个C测试脚本和一个Haskell绑定和一个测试脚本。 C测试脚本有效，Haskell给我一个：

  [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cabal configure和cabal build将编译C ++和C绑定并重现错误。

更新

我已经解决了下面评论中概述的问题。但是，我似乎无法回答我自己的问题。

Answer 1

社区维基回答以供将来参考。解决方案是通过更改cabal文件来更改库呈现给链接器的顺序。

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

尝试与Haskell的C ++绑定：获取未定义的引用错误

1 个答案: