External Interfaces

Default Options File on Windows

The default MEX options file is placed in your user profile directory after you configure your system by running mex -setup. The mex script searches for an options file called mexopts.bat in the following order:

• The current directory
• The user profile directory (returned by the prefdir function)
• The directory specified by [matlabroot '\bin\win32\mexopts']

mex uses the first occurrence of the options file it finds. If no options file is found, mex searches your machine for a supported C compiler and automatically configures itself to use that compiler. Also, during the configuration process, it copies the compiler's default options file to the user profile directory. If multiple compilers are found, you are prompted to select one.

For specific information on the default settings for the MATLAB supported compilers, you can examine the options file, mexopts.bat, or you can invoke the mex script in verbose mode (-v). Verbose mode will print the exact compiler options, prelink commands, if appropriate, and linker options used in the build process for each compiler. Custom Building on Windows gives an overview of the high-level build process.

The User Profile Directory

The Windows user profile directory is a directory that contains user-specific information such as desktop appearance, recently used files, and Start menu items. The mex and mbuild utilities store their respective options files, mexopts.bat and compopts.bat, which are created during the -setup process, in a subdirectory of your user profile directory, named Application Data\MathWorks\MATLAB.

Default Options File on UNIX

Custom Building on UNIX

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