Problem with all Simulink embedded coder examples

so i can not get any of the simulink embedded coder examples to actually generate code.

I have tried several of them as well as making my own very simple model of just a 2 number adder.

Whenever i try to generate code either with CTRL B and or using the generate code wizard i get the exact same error.

The error you would think is benign until you dig further.

### Starting build procedure for: rtwdemo_roll
### Build procedure for rtwdemo_roll aborted due to an error.

Build Summary

Top model targets built:

Model         Action  Rebuild Reason                                    
========================================================================
rtwdemo_roll  Failed  Code generation information file does not exist.  

0 of 1 models built (0 models already up to date)
Build duration: 0h 0m 24.262s
Index exceeds the number of array elements. Index must not exceed 0

So this error would tell me normally i goofed somewhere except its the same error on every matworks example. I am not building the model just following the instructions.

So i ran the build from matlab to see if i could get anymore diagnostic info and i get this

rtwdemo_roll  Failed  Code generation information file does not exist.  

0 of 1 models built (0 models already up to date)
Build duration: 0h 0m 19.946s
Index exceeds the number of array elements. Index must not exceed 0.

Error in coder.make.internal.applyMsvcEnvironment>i_runMsvcSetupCommand (line 82)
    deltaNames{i} = toks{i}{1};

Error in coder.make.internal.applyMsvcEnvironment (line 24)
        i_runMsvcSetupCommand(mexCompDetails);

Error in codebuild>i_setupEnvironment (line 479)
        environmentCleanupFcn = coder.make.internal.applyMsvcEnvironment(mexCompDetails);

Error in codebuild (line 142)
environmentCleanupFcn = i_setupEnvironment...

Error in coder.internal.ModelBuilder>i_buildProcedure (line 1523)
        compileResult = codebuild(lBuildInfoUpdated, compileBuildOptsUpdated);

Error in coder.internal.ModelBuilder.make_rtw (line 119)
                [buildResult, mainObjFolder] = i_buildProcedure...

Error in build_target

Error in build_target

Error in build_standalone_rtw_target

Error in slbuild_private

Error in slbuild_private

Error in sl_feval

Error in slbuild

Error in slbuild

Error in rtwbuild

The error appears to be deeply rooted on line 82 of some buried matlab file. I went to and set a break point there only to find some issue with some enviroment variable and the size of some variable named toks

I am at a complete loss. I have several versions of matlab and have tried them all. I get the same error.

Here is the file that line 82 is causing problems in

function  [cleanupFcn, useCachedSettings] = applyMsvcEnvironment(mexCompDetails)
% applyMsvcEnvironment

% Copyright 2021 The MathWorks, Inc.

mlock

persistent cachedEnvironmentKey
persistent deltaNames
persistent deltaValues
persistent pathPrepend
persistent pathAppend

% Check if requested environment settings are consistent with cached
% settings
environmentKey = ...
    [mexCompDetails.CommandLineShell ' ' mexCompDetails.CommandLineShellArg]; 
useCachedSettings = ~isempty(cachedEnvironmentKey) && ...
    strcmp(environmentKey, cachedEnvironmentKey);

if ~useCachedSettings
    % Need to determine environment settings by running VCVARSALL.BAT
    [deltaNames, deltaValues, pathPrepend, pathAppend] = ...
        i_runMsvcSetupCommand(mexCompDetails);
end

% Capture original value of each environment variable that will be set
variablesToRestore = deltaNames;
originalValues = cell(size(variablesToRestore));
for i=1:length(originalValues)
    originalValues{i} = getenv(variablesToRestore{i});
end
variablesToRestore{end+1} = 'PATH';
originalPath = getenv('PATH');
originalValues{end+1} = originalPath;

% Cleanup function to restore original environment variables
cleanupFcn = onCleanup(@()i_setEnvVars(variablesToRestore, originalValues));

% Apply the new environment settings
i_setEnvVars(deltaNames, deltaValues);
setenv('PATH', [pathPrepend originalPath pathAppend]);

% Finally, allow the environment variables to be reused next without
% re-running VCVARSALL.BAT
cachedEnvironmentKey = environmentKey;


function i_setEnvVars(vars, values)
for i=1:length(vars)
    setenv(vars{i}, values{i});
end

        
function [deltaNames, deltaValues, pathPrepend, pathAppend] = ...
    i_runMsvcSetupCommand(mexCompDetails)

% Generate batch file content to print out the environment after
% VCVARSALL.BAT has run
markerOutput = '===PRINT ENVIRONMENT===';
trailer = ['echo ' markerOutput];
trailer = [newline trailer newline newline 'SET'];
batchFileName = [tempname '.bat'];
coder.make.internal.writeMsvcSetup(batchFileName, mexCompDetails, ...
    'Trailer', trailer);

% Capture original environment 
[~, originalVars] = system('SET');
originalVars = splitlines(string(originalVars));

% Capture environment after running the setup command
[~, updatedVars] = system(batchFileName);
updatedVars = regexprep(updatedVars, ['.*\s+' markerOutput '\s+'], '');
updatedVars = splitlines(string(updatedVars));

% Identify variables that changed
deltaVars = setdiff(updatedVars, originalVars);
toks = regexp(deltaVars, '(\w+)=(.*)', 'tokens', 'once');
deltaNames = cell(size(toks));
deltaValues = cell(size(toks));
for i=1:length(toks)
    deltaNames{i} = toks{i}{1};
    deltaValues{i} = toks{i}{2};
end

% If the path was updated identify the part that was prepended
pathIdx = strcmpi(deltaNames, 'PATH');
if sum(pathIdx)>0
    assert(sum(pathIdx)==1, 'Must be only one match for PATH')
    updatedPath = deltaValues{pathIdx};
    originalPath = getenv('PATH');

    % VCVARSALL.BAT might strip off a trailing semicolon: apply the same
    % cleanup to the path that we check for in the updated path
    originalPathCleaned = regexprep(originalPath, ';+$', '');
    
    % Running VCVARSALL typically prepends and in some cases additionally
    % appends to the path
    k = strfind(updatedPath, originalPathCleaned);
    if isempty(k)
        assert(false, ...
            ['After running VCVARSALL.BAT, the updated path, "%s", ' ...
            'must contain the original path, "%s"'], ...
            updatedPath, originalPathCleaned);
    end
    pathPrepend = updatedPath(1:k(end)-1);
    pathAppend = updatedPath(k(end)+length(originalPathCleaned):end);
    deltaNames = deltaNames(~pathIdx);
    deltaValues = deltaValues(~pathIdx);
else
    pathPrepend = '';
    pathAppend = '';
end

Anyone have any ideas?

Answer 1

[Robert Scott]

If anyone else runs into this, the solution was a stray double quote in my path variable causing all the models to fail.

Visual Studio Command Prompt gives "\Common was unexpected at this time" - Stack Overflow

The solution was found in this stack overflow post.