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c++ - 在 MATLAB 上使用 G++ 构建的问题

问题描述

我对 MATLAB 有点陌生，但目前正在尝试使用 G++（6.3 版）作为编译器来构建 MEX 文件。我收到了这个错误

MEX completed successfully.
Building with 'g++'.
Error using mex
/disks/local/sceneflow2/./external/libtrws/trwsMex.cpp:14:13: error: conflicting declaration ‘typedef
int mwSize’
In file included from /usr/local/MATLAB/R2016a/extern/include/matrix.h:25:0,
                 from /usr/local/MATLAB/R2016a/extern/include/mex.h:51,
                 from /disks/local/sceneflow2/./external/libtrws/trwsMex.cpp:9:
/usr/local/MATLAB/R2016a/extern/include/tmwtypes.h:795:19: error: ‘mwSize’ has a previous
declaration as ‘typedef size_t mwSize’
/disks/local/sceneflow2/./external/libtrws/trwsMex.cpp:15:13: error: conflicting declaration ‘typedef
int mwIndex’
In file included from /usr/local/MATLAB/R2016a/extern/include/matrix.h:25:0,
                 from /usr/local/MATLAB/R2016a/extern/include/mex.h:51,
                 from /disks/local/sceneflow2/./external/libtrws/trwsMex.cpp:9:
/usr/local/MATLAB/R2016a/extern/include/tmwtypes.h:796:19: error: ‘mwIndex’ has a previous
declaration as ‘typedef size_t mwIndex’


Error in make_mex (line 20)
mex ./external/libtrws/trwsMex.cpp -largeArrayDims CXXFLAGS="\$CXXFLAGS -std=c++0x -fpermissive"
-outdir build

我不明白。为什么/usr/local/MATLAB/R2016a/extern/include/tmwtypes.h定义与mwSize冲突/usr/local/MATLAB/R2016a/extern/include/mex.h？它们不是包含在 MATLAB 中的预定义库（意味着它们应该可以正常工作吗？）

顺便说一句，/disks/local/sceneflow2/./external/libtrws/trwsMex.cpp有一条线，其中包括上述mex.h.

标签： c++matlabmex

解决方案

错误消息必须阻塞（对于两个不同的错误），让我们只看第一个。我把它分成三个“行”：

/disks/local/sceneflow2/./external/libtrws/trwsMex.cpp:14:13: error: conflicting declaration
‘typedef int mwSize’

In file included from /usr/local/MATLAB/R2016a/extern/include/matrix.h:25:0,
                 from /usr/local/MATLAB/R2016a/extern/include/mex.h:51,
                 from /disks/local/sceneflow2/./external/libtrws/trwsMex.cpp:9:

/usr/local/MATLAB/R2016a/extern/include/tmwtypes.h:795:19: error: ‘mwSize’ has a previous
declaration as ‘typedef size_t mwSize’

第一行说编译器在文件mwSize的第 14 行找到了一个声明trwsMex.cpp，它说typedef int mwSize.

最后一行说这mwSize已经在tmwtypes.hMATLAB 附带的头文件中定义了。

第二行说这个头文件被 包含matrix.h，被 包含mex.h，被你trwsMex.cpp的第 9 行包含。

因此，要修复错误，请不要在您的 MEX 文件源代码中定义mwSize，mwIndex这些是由 MATLAB 的标头定义的。

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