c++ - MATLAB R2016b - MEX 无法编译 C++ 代码

Question

我的 last post被大量的信息弄得乱七八糟。部分原因是这个问题，希望通过更多信息单独解决这个问题会更有意义。

我正尝试在 MATLAB R2016b 中使用 mex 在 Windows 上编译 C++03 代码。

当我尝试这样做时，出现以下错误:

Error using mex
cpp_mexapi_version.o: In function `mexfilerequiredapiversion':
C:/Progra~1/MATLAB/R2016b/extern/version/cpp_mexapi_version.cpp:4: multiple definition of `mexfilerequiredapiversion'
C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\cpp_mexapi_version.obj:cpp_mexapi_version.cpp:(.text+0x0): first defined here
myclass.o: In function `MyClass::MyClass(int, double*, int, int, int*, double, int, double, double, int, bool, char)':
C:\msys64\home\myName\Desktop\test/myclass.cpp:67: undefined reference to `__imp___acrt_iob_func'
C:\msys64\home\myName\Desktop\test/myclass.cpp:110: undefined reference to `__imp___acrt_iob_func'
C:\msys64\home\myName\Desktop\test/myclass.cpp:121: undefined reference to `__imp___acrt_iob_func'
myclass.o: In function `MyClass::MyClass(int, double*, int, int*, int, double, double, int, char)':
C:\msys64\home\myName\Desktop\test/myclass.cpp:139: undefined reference to `__imp___acrt_iob_func'
C:\msys64\home\myName\Desktop\test/myclass.cpp:178: undefined reference to `__imp___acrt_iob_func'
myclass.o:C:\msys64\home\myName\Desktop\test/myclass.cpp:189: more undefined references to `__imp___acrt_iob_func' follow
myclass.o: In function `MyAssertionClass::MyAssertionClass(char const*, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
C:\msys64\home\myName\Desktop\test/myclass.cpp:1014: undefined reference to `std::__cxx11::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::basic_ostringstream()'
myclass.o: In function `MyAssertionClass::MyAssertionClass(char const*, int, char const*)':
C:\msys64\home\myName\Desktop\test/myclass.cpp:1029: undefined reference to `std::__cxx11::basic_ostringstream<char,
std::char_traits<char>, std::allocator<char> >::basic_ostringstream()'
collect2.exe: error: ld returned 1 exit status

这是失败前的详细日志:

>> mex -v COMPFLAGS='$COMPFLAGS -std=c++03' -IC:\ourLibraryLocation myTargetMex.cpp myclass.o (a few other .o files here) cpp_mexapi_version.o
Verbose mode is on.
Neither -compatibleArrayDims nor -largeArrayDims is selected.
     Using -compatibleArrayDims. In the future, MATLAB will require the use of
     -largeArrayDims and remove the -compatibleArrayDims option.
     For more information:
     http://www.mathworks.com/help/matlab/matlab_external/upgrading-mex-files-to-use-64-bit-api.html.
... Looking for compiler 'MinGW64 Compiler (C++)' ...
... Looking for environment variable 'MW_MINGW64_LOC' ...Yes ('C:\TDM-GCC-64').
... Looking for file 'C:\TDM-GCC-64\bin\g++.exe' ...Yes.
... Looking for folder 'C:\TDM-GCC-64' ...Yes.
Found installed compiler 'MinGW64 Compiler (C++)'.
Set PATH = C:\TDM-GCC-64\bin;C:\Program Files\MATLAB\R2016b\extern\include\win64;C:\Program Files\MATLAB\R2016b\extern\include;C:\Program Files\MATLAB\R2016b\simulink\include;C:\Program Files\MATLAB\R2016b\lib\win64;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\iCLS\;C:\Program Files\Intel\Intel(R) Management Engine Components\iCLS\;C:\Program Files\avs\bin;C:\Program Files\avs\bin32;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files (x86)\Enterprise Vault\EVClient\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files\MATLAB\R2016b\bin;C:\TDM-GCC-64\bin;C:\Users\myName\AppData\Local\Microsoft\WindowsApps;
Set INCLUDE = C:\TDM-GCC-64\include;C:\TDM-GCC-64\include;
Set LIB = C:\TDM-GCC-64\lib;;C:\TDM-GCC-64\lib;;
Set MW_TARGET_ARCH = win64;win64;
Set LIBPATH = C:\Program Files\MATLAB\R2016b\extern\lib\win64;C:\Program Files\MATLAB\R2016b\extern\lib\win64;
Options file details
-------------------------------------------------------------------
    Compiler location: C:\TDM-GCC-64
    Options file: C:\Users\myName\AppData\Roaming\MathWorks\MATLAB\R2016b\mex_C++_win64.xml
    CMDLINE2 : C:\TDM-GCC-64\bin\g++ -m64 -Wl,--no-undefined -shared -s -Wl,"C:\Program Files\MATLAB\R2016b/extern/lib/win64/mingw64/exportsmexfileversion.def" C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\myTargetMex.obj C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\cpp_mexapi_version.obj myclass.o (a few other .o files here) cpp_mexapi_version.o  -L"C:\Program Files\MATLAB\R2016b\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas -o myTargetMex.mexw64
    CXX : C:\TDM-GCC-64\bin\g++
    COMPILER : C:\TDM-GCC-64\bin\g++
    DEFINES : -DMX_COMPAT_32   -m64 -DMATLAB_MEX_FILE
    MATLABMEX : -DMATLAB_MEX_FILE
    CXXFLAGS : -fexceptions -fno-omit-frame-pointer -std=c++11
    INCLUDE : -IC:\ourLibraryLocation  -I"C:\Program Files\MATLAB\R2016b/extern/include" -I"C:\Program Files\MATLAB\R2016b/simulink/include"
    CXXOPTIMFLAGS : -O -DNDEBUG
    CXXDEBUGFLAGS : -g
    LDXX : C:\TDM-GCC-64\bin\g++
    LINKER : C:\TDM-GCC-64\bin\g++
    LDFLAGS : -m64 -Wl,--no-undefined
    LDTYPE : -shared
    LINKEXPORT : -Wl,"C:\Program Files\MATLAB\R2016b/extern/lib/win64/mingw64/mexFunction.def"
    LINKEXPORTVER : -Wl,"C:\Program Files\MATLAB\R2016b/extern/lib/win64/mingw64/exportsmexfileversion.def"
    LIBLOC : C:\Program Files\MATLAB\R2016b\extern\lib\win64\mingw64
    LINKLIBS : -L"C:\Program Files\MATLAB\R2016b\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas
    LDOPTIMFLAGS : -s
    LDDEBUGFLAGS : -g
    OBJEXT : .obj
    LDEXT : .mexw64
    SETENV : set COMPILER=g++
                set COMPFLAGS=-c -fexceptions -fno-omit-frame-pointer -std=c++11 -DMX_COMPAT_32   -m64 -DMATLAB_MEX_FILE  -DMATLAB_MEX_FILE
                set OPTIMFLAGS=-O -DNDEBUG
                set DEBUGFLAGS=-g
                set LINKER=g++
                set LINKFLAGS=-m64 -Wl,--no-undefined -shared -L"C:\Program Files\MATLAB\R2016b\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas -Wl,"C:\Program Files\MATLAB\R2016b/extern/lib/win64/mingw64/mexFunction.def"
                set LINKDEBUGFLAGS=-g
                set NAME_OUTPUT= -o "%OUTDIR%%MEX_NAME%%MEX_EXT%"
    MINGWROOT : C:\TDM-GCC-64
    MATLABROOT : C:\Program Files\MATLAB\R2016b
    ARCH : win64
    SRC : C:\Users\myName\Desktop\test\myTargetMex.cpp;"C:\Program Files\MATLAB\R2016b\extern\version\cpp_mexapi_version.cpp"
    OBJ : C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\myTargetMex.obj;C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\cpp_mexapi_version.obj
    OBJS : C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\myTargetMex.obj C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\cpp_mexapi_version.obj myclass.o (a few other .o files here) cpp_mexapi_version.o
    SRCROOT : C:\Users\myName\Desktop\test\myTargetMex
    DEF : C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\myTargetMex.def
    EXP : myTargetMex.exp
    LIB : myTargetMex.lib
    EXE : myTargetMex.mexw64
    ILK : myTargetMex.ilk
    MANIFEST : myTargetMex.mexw64.manifest
    TEMPNAME : myTargetMex
    EXEDIR :
    EXENAME : myTargetMex
    COMPFLAGS :  -std=c++03
    OPTIM : -O -DNDEBUG
    LINKOPTIM : -s
    CMDLINE1_0 : C:\TDM-GCC-64\bin\g++ -c -DMX_COMPAT_32   -m64 -DMATLAB_MEX_FILE  -IC:\ourLibraryLocation  -I"C:\Program Files\MATLAB\R2016b/extern/include" -I"C:\Program Files\MATLAB\R2016b/simulink/include" -fexceptions -fno-omit-frame-pointer -std=c++11 -O -DNDEBUG C:\Users\myName\Desktop\test\myTargetMex.cpp -o C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\myTargetMex.obj
    CMDLINE1_1 : C:\TDM-GCC-64\bin\g++ -c -DMX_COMPAT_32   -m64 -DMATLAB_MEX_FILE  -IC:\ourLibraryLocation  -I"C:\Program Files\MATLAB\R2016b/extern/include" -I"C:\Program Files\MATLAB\R2016b/simulink/include" -fexceptions -fno-omit-frame-pointer -std=c++11 -O -DNDEBUG "C:\Program Files\MATLAB\R2016b\extern\version\cpp_mexapi_version.cpp" -o C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\cpp_mexapi_version.obj
-------------------------------------------------------------------
Building with 'MinGW64 Compiler (C++)'.
C:\TDM-GCC-64\bin\g++ -c -DMX_COMPAT_32   -m64 -DMATLAB_MEX_FILE  -IC:\ourLibraryLocation  -I"C:\Program Files\MATLAB\R2016b/extern/include" -I"C:\Program Files\MATLAB\R2016b/simulink/include" -fexceptions -fno-omit-frame-pointer -std=c++11 -O -DNDEBUG C:\Users\myName\Desktop\test\myTargetMex.cpp -o C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\myTargetMex.obj
C:\TDM-GCC-64\bin\g++ -c -DMX_COMPAT_32   -m64 -DMATLAB_MEX_FILE  -IC:\ourLibraryLocation  -I"C:\Program Files\MATLAB\R2016b/extern/include" -I"C:\Program Files\MATLAB\R2016b/simulink/include" -fexceptions -fno-omit-frame-pointer -std=c++11 -O -DNDEBUG "C:\Program Files\MATLAB\R2016b\extern\version\cpp_mexapi_version.cpp" -o C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\cpp_mexapi_version.obj
C:\TDM-GCC-64\bin\g++ -m64 -Wl,--no-undefined -shared -s -Wl,"C:\Program Files\MATLAB\R2016b/extern/lib/win64/mingw64/exportsmexfileversion.def" C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\myTargetMex.obj C:\Users\myName\AppData\Local\Temp\2\mex_53351148310745_8852\cpp_mexapi_version.obj myclass.o (a few other .o files here) cpp_mexapi_version.o  -L"C:\Program Files\MATLAB\R2016b\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas -o myTargetMex.mexw64

明确地说，MyClass 只是包含在 myTargetMex 中的另一个类。它恰好是第一个，所以当尝试编译时它自然是第一个失败的东西。 (据我所知)

感谢您的帮助!

Answer 1

结果是这样的:

1. 我需要使用 $CXXFLAGS 而不是 $COMPFLAGS(详细输出显示 COMPFLAGS 从未出现在此处，但 CXXFLAGS 出现)

2. 执行 CXXFLAGS='$CXXFLAGS -std=c++03' 只是将标志添加 到现有标志集。 (呃，但我错过了这个)默认情况下，现有的标志集包括 -std=c++11。从技术上讲，最后一个只是覆盖了旧的，但看起来仍然很奇怪。更好的方法是:CXXFLAGS='-fexceptions -fno-omit-frame-pointer -std=c++03'，所以我包含了它已有的所有内容，但只是替换了C++标准部分。您可以对任何要更改的内容执行相同的操作。像 CXXOPTIMFLAGS='-O0 -DNDEBUG' 只会用 -O0

替换 -O

3. 旁注:如果您的项目混合使用 C 和 CPP，那就太麻烦了。帮自己一个忙，将所有 .C 文件更改为 .CPP。我们有那个，当 MEX 试图编译 .C 文件时，它使用 GCC 而不是 G++，并且有一个嘶嘶声。最好避免这种情况。提醒一下，旧的 mexFunction() 入口点在 .C 文件中非常好。 mexFunction() 不需要在 .C 文件中!

非常感谢Cris Luengo他用他的 MATLAB 和 MEX 文件知识再次拯救了我。 :) 如果他提出一个解决方案，我会将他的解决方案标记为答案。