How can I prevent MATLAB Coder from truncating the variable names in generated code?

I am using MATLAB Coder to convert MATLAB Code to C Code. In the generated code, MATLAB Coder truncates the names of any global variables that are longer than 30 characters. Additionally, MATLAB adds identifiers like "c_*", or "d_"*" to the start of variables to distinguish ones that become the same after truncation. As a result, I am no longer able to differentiate between the variables without searching through the code. For example, suppose I have the following variables in my MATLAB code:

global this_is_a_very_long_variable_name

global this_is_a_very_long_variable_name_to_use 

After MATLAB Coder conversion, these variables have the following names in the generated C code

c_this_is_a_very_long_variable_ 

d_this_is_a_very_long_variable_

Is there a way to avoid truncating the variable names in MATLAB Coder? 

Answer 1

[MathWorks Support Team]

You can avoid truncating the variable names by specifying the maximum identifier length.

To specify the maximum length in MATLAB Coder app:

1. Proceed to the 'Generate Code' pane and click on the 'More Settings' option. This will open a pop-up where several options are visible.
2. Now, navigate to 'Code Appearance' tab on the left side tab. You will see the 'Maximum Identifier length' field set to a default of 31. You can specify maximum number of characters in generated function, type definition, and variable names here. To avoid truncation of identifiers by the target C compiler, specify a value that matches the maximum identifier length of the target C compiler.

Please note that this parameter does not apply to exported identifiers, such as the generated names for entry-point functions or emxArray API functions. If the length of an exported identifier exceeds the maximum identifier length of the target C compiler, the target C compiler truncates the exported identifier.