How can I modify the build information for mex code generation with the codegen function?

I would like to define a custom toolchain that I can use to set compiler and linker options, among other settings. However, after performing the command:

>> cfg = coder.config('mex')

I do not see any such option. 

I would like to specify compiler and linker flags, or otherwise edit the build configuration using the codegen command. How can I do this without manually editing the makefile for mex code generation?

Answer 1

[MathWorks Support Team]

Codegen('mex') does not support custom toolchains, as noted in the documentation at the following link:

https://www.mathworks.com/help/coder/ug/use-the-custom-toolchain.html

Compiler settings are inherited from the "mex -setup" command.

Instead, you can use the Post-Code-generation command to pass a custom Build Information Object to the "codegen" command.

For example, you could add a link flag with the following function:

function setbuildargs(buildInfo)
     linkFlags = {'-lpthread'};
     buildInfo.addLinkFlags(linkFlags);
     cfg = coder.config('mex');
end

That function can then be used to pass the build information object via the PostCodeGenCommand:

>> cfg.PostCodeGenCommand = 'setbuildargs(buildInfo)';

More information and further examples can be found in the documentation at the following link:

https://www.mathworks.com/help/coder/ug/customizing-the-post-code-generation-build-process.html