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Asked: 2026-06-08T08:18:47+00:00

I’m using mcc to compile my MATLAB project. The machine I’m using has many

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I’m using mcc to compile my MATLAB project. The machine I’m using has many MATLAB toolboxes installed on it, but my code only requires a few (such as distcomp and images). However, whenever I run mcc, it ends up “processing” the mcc.enc files for many toolboxes, including those that my code does not need.

Here is the beginning of the output from mcc (I’m running it with -R '-nodisplay' to be compatible with the cluster I’m using).

Warning: No display specified.  You will not be able to display graphics on the screen.
Compiler version: 4.15 (R2011a)
Processing /cm/shared/apps/matlab/7.12.0/toolbox/matlab/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/distcomp/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/images/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/stats/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/shared/imageslib/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/shared/system/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/shared/spcuilib/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/control/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/shared/controllib/engine/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/shared/controllib/general/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/signal/mcc.enc
Processing /cm/shared/apps/matlab/7.12.0/toolbox/nnet/mcc.enc

I’ve noticed it does the same thing when running mcc on my desktop as well. Some of these mcc.enc files (especially …/signal/mcc.enc and …/nnet/mcc.enc), take more time to process than it takes the rest of mcc to execute. Is there any way to exclude processing unneeded mcc.enc files?

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1 Answer

  1. Editorial Team

    Using the “deplyment tool” in the MATLAB IDE, go the project settings and from the “toolboxes on path” tab, unselect all toolboxes you do not need.

    screenshot

    Also, there is an mcc argument -N that clears all folders from the path and only keep the core MATLAB ones.

    -N Clear Path

    Passing -N effectively clears the path of all folders except the
    following core folders (this list is subject to change over time):

    • matlabroot/toolbox/matlab
    • matlabroot/toolbox/local
    • matlabroot/toolbox/compiler/deploy

    It also retains all subfolders of the above list that appear on the
    MATLAB path at compile time. Including -N on the command line allows
    you to replace folders from the original path, while retaining the
    relative ordering of the included folders. All subfolders of the
    included folders that appear on the original path are also included.
    In addition, the -N option retains all folders that the user has
    included on the path that are not under matlabroot/toolbox.

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