My solution for Keil IDE is using time and date plus two fixed major and minor values for generating a unique version string based on time.

void get_compiled_version(uint8_t major,uint8_t minor,uint8_t* version)
{
    const char months[][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
                                   "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
    char *CompileTime = __TIME__;
    char *CompileDate = __DATE__;

    version[0] = (CompileTime[6] - '0') * 10 + (CompileTime[7] - '0');//second
    version[1]  = (CompileTime[3] - '0') * 10 + (CompileTime[4] - '0');//minute
    version[2]  = (CompileTime[0] - '0') * 10 + (CompileTime[1] - '0');//hour
    version[3]  = (CompileDate[4] - '0') * 10 + (CompileDate[5] - '0');//day
    version[5]  = (CompileDate[9] - '0') * 10 + (CompileDate[10] - '0');//year
    uint8_t month = 0;
    for (int i = 0; i < 12; ++i) 
    {
    if (strncmp(CompileDate, months[i], 3) == 0) 
        {
            month = i + 1; // Months are 1-based
            break;
        }
    }
    version[4]=month;//month
    version[6]=minor;
    version[7]=major;
}

this will return an array that contains 8 bytes of the date and time of the last build.
if we print them in a string, we will have something like this:

printf("%d.%d.%2d%2d%2d%2d%2d%2d,ver[7],ver[6],ver[5],ver[4],ver[3],ver[2],ver[1],ver[0]);

Version: 0.1.240711075236

0 and 1 are major and minor parts of the version which you can feed them into the function
this value will change on every build and will be unique