关于osx 10.12中MATLAB 中mex无法使用的解决办法

如果碰到mex -setup时无法找到编译器的问题

关于关于网上提到的许多10.11可行解决方法以及matlab官网提出的方法，在10.12中并不可用（官网搪塞说2016版不支持10.12,确实bug多，不过要是实在需要也是有办法的）。

以下是matlab官网上给出的10.11的办法：（10.12在后面）

“Please note that the instructions and patch provided here is specifically written for using Xcode7.0 with MATLAB R2015b. Please contact MathWorks Technical Support if you are using Xcode 7.1 or higher.

By default, MATLAB R2015b does not detect Xcode 7.0. To add support for Xcode 7.0 in MATLAB R2015b, download the files attached to this article. Please follow these instructions to download and install the files (screenshots were taken in Mac OS X 10.10.5 Yosemite):

  1) Download the file xcode7_mexopts.zip, which you will find attached to this article. Extract the contents of xcode7_mexopts.zip to your Downloads directory. Extracting the ZIP file will create a directory in Downloads called xcode7_mexopts.

2) Open MATLAB R2015b. Navigate to MATLAB's preference directory by typing the following command in the command window:

>> cd( prefdir );

3) Using MATLAB's "Current Folder" browser, ensure that there are no XML files that begin with "mex_" (e.g. mex_C_maci64.xml). If such files exist, remove them from the preference directory.

4) Navigate to the MATLAB directory. In MATLAB, you can do so by entering the following command at the MATLAB command prompt:

>> cd( fullfile( matlabroot, 'bin', 'maci64', 'mexopts' ) );

5) Back up the original files in the mexopts directory. You can run the following MATLAB commands to back up the files:

>> mkdir mexoptsContentsOLD>> movefile *.xml mexoptsContentsOLD/

Keep the backup separate from the downloaded files such that you can revert to the backup files if necessary.

6) Replace any files in the mexopts directory with the corresponding files in the Downloads folder, xcode7_mexopts. You can replace the files in MATLAB by entering the following command at the MATLAB command prompt:

>> movefile( '~/Downloads/xcode7_mexopts/*.xml', '.' );

7) Restart MATLAB R2015b. Execute "mex -setup" at the MATLAB command prompt as shown below and verify that MEX detects Xcode 7.0.

>> mex -setup

Alternate Solution:

The SDK needed could be in the Xcode package with the path:

/Applications/XCODE/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk

Please place this in:

/Library/Developer/CommandLineTools/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk 

This should resolve the issue.

If MEX continues to return an error, please contact MathWorks Technical Support.”

首先按照所有的相关教程共同的方法安装xcode的command line tool接着下载那些文档。。。。全部同10.11，最终还是无法运行

原因其实很简单，是因为下载替换的几个xml中搜索的sdk不包括10.12的sdk，需要手动在xml文档中修改添加即好。

方法：打开根据上述方法替换的xml文档的目录下的xml文档：编辑它们，在里面凡事能找到10.11的下年复制一遍语句并将其改为10.12即可

THEN ALL DONE ENJOY IT