GCC C / C ++ MEX Matlab R2015 Mac OS X（带OpenMP）不工作 [英] GCC C/C++ MEX Matlab R2015 Mac OS X (with OpenMP) doesn't work

问题描述

我试图在Matlab中编译一个非常简单的MEX文件使用GCC / G ++ ...
首先我检查，这已经安装在matlab通过：
！which gcc

输出：
/ usr / bin / gcc ...
之后，我尝试执行以下操作：

$ b b

mex -v GCC ='/ usr / bin / gcc'hello.c

但它仍然使用XCode Clang ...
编译这是使用G ++与OPENMP库进行并行计算。

已知不是由Mathworks支持，而是POSSIBLE。

解决方案

方式来解决它...
首先，文件mexopts.sh默认情况下不出现在文件夹中，是必要的打开一个终端，并寻找它并创建它（然后Matlab会重定向到它自动用MEX编译）：

  find〜/ -name'mexopts.sh'
  

并会显示：

  / Users / FOO //.Trash/MATLAB_R2014a.app/bin/mexopts.sh 
  

然后，将其复制为：

  cp /Users/FOO//.Trash/MATLAB_R2014a.app/bin/mexopts.sh〜/ .matlab / R2014a 
  

然后转到文件夹 cd〜/ .matlab / R2014a
并将您的用户的权限更改为：

  chmod u + rwx mexopts.sh 
  

然后，使用默认文本编辑器（推荐Sublime文本）打开它：

 打开mexopts.sh 
  

更改在哪里出现macosx10.7到您当前的版本，在我的案例macos10.10
然后，修改以下行描述在（ http://www.mathworks.com/matlabcentral/newsreader/view_thread/334250 ）：

 ＃CC ='xcrun -sdk macosx10.7 clang'#OLD $ b $ c CC ='xcrun / usr / local / bin / gcc'#NEW 
 
 
 
＃CXX ='xcrun -sdk macosx10.7 clang ++'#OLD 
 CXX ='xcrun / usr / local / bin / g ++'#NEW 
 
 
 
＃CLIBS =$ CLIBS -lstdc ++#OLD 
 CLIBS =$ CLIBS -lstdc ++ -I / usr / local / lib -lgomp#directory  #CXXLIBS =$ MLIBS -lstdc ++#OLD 
 CXXLIBS =$ MLIBS -lstdc ++ -I / usr / local / lib -lgomp#NEW 
  

重要注意：
确保当前的G ++ / G ++ 4.9能够使用OpenMP进行编译， c $ c>< omp.h> 在命令行中执行的hello world文件中：

  g ++  -  4.9 -o test hello.cpp -fopenmp 
  

或

  g ++ -o test hello.cpp -fopenmp 
  

也可能是文件已损坏，并且必须执行无法编译fortran因为dyld：库未加载：

  brew rm cloog 
 
 brew install cloog 
  

（但先检查）...

也有可能，如果你不能编译OMP是必要的做一些事情，如这里描述的（在OS X Yosemite上使用gcc编译器编译OpenMP程序）：
1.获得一个新的gcc来自 http://hpc.sourceforge.net/
的编译器2.放置一个新的可执行文件夹$ sudo tar -xvf gcc-4.9-bin.tar -C /
3.通过export切换到PATH = / usr / local / bin：$ PATH

最后，尝试使用以下命令编译您的MEX文件：

  mex hello.cpp COMPFLAGS =/ openmp $ COMPFLAGS
  

这是
...。

I'm trying to compile a very simple MEX file in Matlab using GCC/G++... First I checked that this is already installed in matlab by: !which gcc

output: /usr/bin/gcc ... After, I tried to do the following:

mex -v GCC='/usr/bin/gcc' hello.c

but it stills compiling with XCode Clang... This is to use G++ with OPENMP library for parallel computing.

Is known that is NOT OFFICIALLY Supported by Mathworks, but POSSIBLE.

解决方案

Finally, I found a proper way to solve it... First, the file mexopts.sh doesn't appear in the folder by default, is necessary to open a terminal and look for it and create it (then Matlab will redirect to it automatically when compiling with MEX):

find ~/ -name 'mexopts.sh' 

and will appear:

/Users/FOO//.Trash/MATLAB_R2014a.app/bin/mexopts.sh

Then, copy it as:

cp /Users/FOO//.Trash/MATLAB_R2014a.app/bin/mexopts.sh ~/.matlab/R2014a

then go to the folder cd ~/.matlab/R2014a and change permissions for your user as:

chmod u+rwx mexopts.sh

then, open it with your default text editor (Sublime text recommended) as:

open mexopts.sh

and edit the following: Change where appears macosx10.7 to your current version, in my case macos10.10 then, modify the following lines as describen in (http://www.mathworks.com/matlabcentral/newsreader/view_thread/334250):

# CC='xcrun -sdk macosx10.7 clang' #OLD
CC='xcrun /usr/local/bin/gcc' #NEW



# CXX='xcrun -sdk macosx10.7 clang++' #OLD
 CXX='xcrun /usr/local/bin/g++' #NEW



# CLIBS="$CLIBS -lstdc++" #OLD
CLIBS="$CLIBS -lstdc++ -I/usr/local/lib -lgomp" #directory <-I/usr/local/lib> #NEW
#CXXLIBS="$MLIBS -lstdc++" #OLD
CXXLIBS="$MLIBS -lstdc++ -I/usr/local/lib -lgomp" #NEW

IMPORTANT NOTE: Make sure that your current G++/G++4.9 is able to compile with OpenMP, trying to include <omp.h> in a hello world file doing in the command line:

g++-4.9 -o test hello.cpp -fopenmp

or

g++ -o test hello.cpp -fopenmp

is also possible that a file is corrupted and is necessary to do Can not compile fortran because dyld: Library not loaded :

brew rm cloog

brew install cloog

(But check first)...

Is also possible that if you're not able to compile with OMP is necessary to do first a couple of things as described here (Compile OpenMP programs with gcc compiler on OS X Yosemite): 1. Got a new gcc complier from http://hpc.sourceforge.net/ 2. Place a new executable folder by $ sudo tar -xvf gcc-4.9-bin.tar -C / 3. Switched to it by export PATH=/usr/local/bin:$PATH

Finally, try to compile your MEX file with:

mex hello.cpp COMPFLAGS="/openmp $COMPFLAGS"

That's it ... .

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