Matlab MEX 使用笔记

Matlab 中使用 C/C++ 或 Fortran 代码的一种方式是利用 mex 进行编译，然后调用。

1 编译器设置

mex -setup

有可能见到的信息是这个样子：

>> mex  -setup
 
Welcome to mex -setup.  This utility will help you set up  
a default compiler.  For a list of supported compilers, see  
http://www.mathworks.com/support/compilers/R2012b/win64.html 
 
Please choose your compiler for building MEX-files: 
 
Would you like mex to locate installed compilers [y]/n? y
 
No supported SDK or compiler was found on this computer. 
For a list of supported compilers, see  
http://www.mathworks.com/support/compilers/R2012b/win64.html  
 
Error using mex (line 206)
Unable to complete successfully.

Matlab 无法完成自动搜索编译器，可以选择 n 再尝试。

Welcome to mex -setup.  This utility will help you set up  
a default compiler.  For a list of supported compilers, see  
http://www.mathworks.com/support/compilers/R2012b/win64.html 
 
Please choose your compiler for building MEX-files: 
 
Would you like mex to locate installed compilers [y]/n? n
 
Select a compiler: 
[1] Intel C++ 12.0 (with Microsoft Software Development Kit (SDK) linker) 
[2] Intel C++ 12.0 (with Microsoft Visual C++ 2008 SP1 linker) 
[3] Intel C++ 12.0 (with Microsoft Visual C++ 2010 linker) 
[4] Intel C++ 11.1 (with Microsoft Visual C++ 2008 SP1 linker) 
[5] Intel Visual Fortran 12 (with Microsoft Software Development Kit (SDK) linker) 
[6] Intel Visual Fortran 12.0 (with Microsoft Visual C++ 2008 SP1 linker) 
[7] Intel Visual Fortran 12.0 (with Microsoft Visual C++ 2008 Shell linker) 
[8] Intel Visual Fortran 12.0 (with Microsoft Visual C++ 2010 linker) 
[9] Intel Visual Fortran 11.1 (with Microsoft Visual C++ 2008 SP1 linker) 
[10] Intel Visual Fortran 11.1 (with Microsoft Visual C++ 2008 Shell linker) 
[11] Microsoft Software Development Kit (SDK) 7.1 
[12] Microsoft Visual C++ 2005 SP1 
[13] Microsoft Visual C++ 2008 SP1 
[14] Microsoft Visual C++ 2010 
 
[0] None 

比较糟糕，无法匹配，用的是 2013 版的 Intel Fortran。可能需要自己编译了。

2 编译文件

mex xxx.c

mex xxx.f90

mex -v COMPFLAGS='/fpp /Qprec "/ID:\PROGS\MATLAB\R2010A/extern/include" -c -nologo -DMATLAB_MEX_FILE /fixed /fp:source /assume:bscc /libs:static /thread' LDFLAGS='$LDFLAGS -mt' supcrt.f supcrt92.f

>> mex -v supcrt.f supcrt92.f
 This is mex, Copyright 1984-2007 The MathWorks, Inc. 
 
-> Default options filename found in C:\Documents and Settings\hu\Application Data\MathWorks\MATLAB\R2010a 
---------------------------------------------------------------- 
->    Options file           = C:\Documents and Settings\hu\Application Data\MathWorks\MATLAB\R2010a\mexopts.bat 
      MATLAB                 = D:\PROGS\MATLAB\R2010A 
->    COMPILER               = ifort 
->    Compiler flags: 
         COMPFLAGS           = /fpp /Qprec "/ID:\PROGS\MATLAB\R2010A/extern/include" -c -nologo -DMATLAB_MEX_FILE /fixed /MD /fp:source /assume:bscc 
         OPTIMFLAGS          = /O2 /DNDEBUG 
         DEBUGFLAGS          = /Z7 
         arguments           =  
         Name switch         = /Fo 
->    Pre-linking commands   =  
->    LINKER                 = link 
->    Link directives: 
         LINKFLAGS           = /dll /export:MEXFUNCTION /LIBPATH:"D:\PROGS\MATLAB\R2010A\extern\lib\win32\microsoft" libmx.lib libmex.lib libmat.lib /implib:"F:\TEMP\MEX_VQ~1\templib.x" /MAP:"supcrt.mexw32.map" /NOLOGO /INCREMENTAL:NO 
         LINKDEBUGFLAGS      = /debug /PDB:"supcrt.mexw32.pdb" 
         LINKFLAGSPOST       =  
         Name directive      = /out:"supcrt.mexw32" 
         File link directive =  
         Lib. link directive =  
         Rsp file indicator  = @ 
->    Resource Compiler      = rc /fo "mexversion.res" 
->    Resource Linker        =  
---------------------------------------------------------------- 
 
 
--> ifort  /fpp /Qprec "/ID:\PROGS\MATLAB\R2010A/extern/include" -c -nologo -DMATLAB_MEX_FILE /fixed /MD /fp:source /assume:bscc /FoF:\TEMP\MEX_VQ~1\supcrt.obj /O2 /DNDEBUG -DMX_COMPAT_32 supcrt.f 
 
ifort: warning #10268: Microsoft compiler version 6.0 or earlier is not supported 
 
--> ifort  /fpp /Qprec "/ID:\PROGS\MATLAB\R2010A/extern/include" -c -nologo -DMATLAB_MEX_FILE /fixed /MD /fp:source /assume:bscc /FoF:\TEMP\MEX_VQ~1\supcrt92.obj /O2 /DNDEBUG -DMX_COMPAT_32 supcrt92.f 
 
ifort: warning #10268: Microsoft compiler version 6.0 or earlier is not supported 
supcrt92.f(664): warning #6375: Because of COMMON, the alignment of object is inconsistent with its type   [ZPRTR] 
      COMMON /refval/ mwH2O, R, Pref, Tref, ZPrTr, YPrTr 
--------------------------------------------^ 
supcrt92.f(664): warning #6375: Because of COMMON, the alignment of object is inconsistent with its type   [YPRTR] 
      COMMON /refval/ mwH2O, R, Pref, Tref, ZPrTr, YPrTr 
---------------------------------------------------^ 
    Contents of F:\TEMP\MEX_VQ~1\mex_tmp.rsp: 
  F:\TEMP\MEX_VQ~1\supcrt.obj  F:\TEMP\MEX_VQ~1\supcrt92.obj 
 
 
--> link /out:"supcrt.mexw32" /dll /export:MEXFUNCTION /LIBPATH:"D:\PROGS\MATLAB\R2010A\extern\lib\win32\microsoft" libmx.lib libmex.lib libmat.lib /implib:"F:\TEMP\MEX_VQ~1\templib.x" /MAP:"supcrt.mexw32.map" /NOLOGO /INCREMENTAL:NO  @F:\TEMP\MEX_VQ~1\MEX_TMP.RSP   
 
   Creating library F:\TEMP\MEX_VQ~1\templib.x and object F:\TEMP\MEX_VQ~1\templib.exp 
 
--> del "F:\TEMP\MEX_VQ~1\templib.x" "F:\TEMP\MEX_VQ~1\templib.exp" 
 
 
--> mt -outputresource:"supcrt.mexw32";2 -manifest "supcrt.mexw32.manifest" 
 
Microsoft (R) Manifest Tool version 5.2.3790.2075  
Copyright (c) Microsoft Corporation 2005.   
All rights reserved.  
 
--> del "supcrt.mexw32.manifest" 
 
 
--> del "supcrt.mexw32.map" 

3 调用

很简单，直接调用即可。

xxx

问题总结：

主要问题在于编译器的设置，需要安装特定版本的C/C++编译器和Fortran编译器，考虑自己编写脚本或CMake来编译。

实际上，mex文件就是一个导出了 mexFunction 函数的动态链接库文件，按DLL方式编译，加上导出信息即可。

/export:MEXFUNCTION