在 MATLAB 上使用 G++ 构建问题

Question

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

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 对 mwSize 的定义与 /usr/local/MATLAB/R2016a/extern/include/mex.h 冲突？它们不是包含在 MATLAB 中的预定义库吗（意味着它们应该可以正常工作？）

顺便说一下，/disks/local/sceneflow2/./external/libtrws/trwsMex.cpp 有一行包含上述 mex.h。

Answer 1

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 "lines":

/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’

第一行表示编译器在 trwsMex.cpp 文件的第 14 行找到了 mwSize 的声明，其中显示 typedef int mwSize.

最后一行说这个mwSize已经在MATLAB自带的tmwtypes.hheader中定义了

第二行说这个 header 文件被 matrix.h 包含，它被 mex.h 包含，它被你在第 9 行的 trwsMex.cpp 包含。

因此，要修复错误，请不要在 MEX-file 源代码中定义 mwSize 和 mwIndex，它们由 MATLAB 的 header 定义。

在 MATLAB 上使用 G++ 构建问题

Problems building with G++ on MATLAB

c++

matlab

mex