Issue: Local Var not correct in debug

Hello,

Thanks a lot for MSPGCC. It's a really good solution to develop a software on a MSP430.

I just need some help because I worked 3 days on this bug: all local var in main() are not corrects in debug.

Configuration:

- Windows 7
- Eclipse Indigo Service Release 1
- msp430-gcc 4.6.1 (Package mspgcc-20111224-experimental)
- C/C++ GCC Cross Compiler Support 1.0.0.201109151620
- C/C++ GDB Hardware Debugging 7.0.0.201109151620
- MSP-FET430UIF with MSP430.dll developper package rev 3.02.01.009 from TI (MSP430.dll 3.2.1.9 and HIL.dll 1.2.6.0)
- MSP430-gdbproxy.exe (14-11-2006)

I did tests with another version of Eclipse: Helios but it was the same problem.

Description:

Example 1

#include <msp430.h>

unsigned short e = 0;

int main(void)
{
     WDTCTL = WDTPW + WDTHOLD; 
    
     while(1)
     {
            e++;
     }

     return 0;
}

This example give the correct value of e in debug.

Example 2

#include <msp430.h>

int main(void)
{
     WDTCTL = WDTPW + WDTHOLD; 

    unsigned short e = 0;
    
     while(1)
     {
            e++;
     }

     return 0;
}

This example give a wrong random value of e in debug.

Example 3

#include <msp430.h>

int main(void)
{
     WDTCTL = WDTPW + WDTHOLD; 

    unsigned short e = 0;
    unsigned short i = 1;
    unsigned short c = 2;
    
     while(1)
     {
            e++;
            i++;
            c++;
     }

     return 0;
}

This example give wrong values for e, i and c but I see i = e and c = i in debug. There is a shift of 1 in the vars.

Example 4

If I create a new function:

void test()
{
        unsigned short y = 0;

y++;
}

I call it into the main function. In this case, I can see the correct value for the local var y in debug.

Conclusion

I try to correct this bug with all version of mspgcc MinGW provided on sourceforge but it was still the same think.
The only solution I found is to use mspgcc4 (older version: mspgcc4-20110312.zip). With this version, I don't have a shift in my variables in debug but I can't use the latest microcontrollers provided by TI.

Thanks in advance for your help.

I believe you have rediscovered this bug.  Workarounds should include enabling optimization, or moving the code to a different function and calling it from main().

Thanks Pabigot for the link and the workaround.

I created a __main() function into main().

In this case, the debug works correctly with local vars.

Best Regards

By Curiosity, I put levels of O1, O2, O3 and OS for the optimization.

In this case, I can not debug correctly.

The pointer is still blocked on the first instruction (WDTCTL = WDTPW + WDTHOLD;) in the main function.

The conclusion is I can use only the __main() solution.

Did you tried to set
unsigned short e=0;
before
WDTCTL = WDTPW + WDTHOLD;
?

I am using CCE 3. I do know the thing, but I do not know why.
The declaration could not be put in the middle of the function.
Maybe it is the same problem.