How to make a function uncallable by the VxWorks Console

Is there a way to make C functions in VxWorks uncallable from the VxWorks console?

I know setting the function to static would work, but I also need the function to be called from outside its source file.

Example

SpeakerDiagnostics.h

extern void reportSpeakerError(int error); 



SpeakerDiagnostics.c

static int errorBitMask = 0;

void reportSpeakerError(int error)
{
   errorBitMask |= error;
}



Diagnostics.c

#include "SpeakerDiagnostics.h"

void checkSpeaker()
{
    int broken = 0x1;

    //some code

    if (some error check fails)
    {
        reportSpeakerError(broken);
    }
}

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