Static Variable Initialization Failed

Hi, I am using STM32F4 Discovery board and Keil MDK-ARM version 4.53.0.0.I made some code which contains static variable.I have made two different .uvision projects in which project A works fine(static variable gets initialized to zero) whereas in project B this variable shows garbage value.The only difference in these two projects is startup file that is created automatically at the time of project creation.I want to know how this file differ for the same environment? The project scenarios are as given below:

The source code for both are same as follow.
*********************************************
#include <stdio.h>;
#define MAX 5

void sumIt(int);

void main()
{

int i =0;
int array[5]={1,2,3,4,5};

for(i = 0; i<MAX; ++i)
sumIt(array[i]);

}

void sumIt(int num)
{

static int sum = 0;

sum+=num;

}

*********************************************
1.Project/compiler settings and other environment settings are also same for both.

2.The only difference is in the start up file (That is loaded automatically by microvision while creating project)

PARAMETER
=========
The difference in the start up file is as follow

Project A
============
IMPORT __main
LDR R0, =SystemInit
BLX R0
LDR R0, =__main
BX R0
ENDP

Project B
============
IMPORT main
LDR R0, =SystemInit
BLX R0
LDR R0, =main
BX R0
ENDP

3.As a result of this, change seen in the map file is as follow PARAMETER =========
MAP File

Project A
============
startup_stm32f4xx.o(.text) refers to __main.o(!!!main) for __main

Project B
============
startup_stm32f4xx.o(.text) refers to sample.o(.text) for main
(sample.o is .object code of source file sample.c)

4.And as a result of these, variable gets initialized with values as follow

PARAMETER
=========
variable value

Project A
============
sum = 0x00000000(initialized to zero)

Project B
============
sum=0x1C49D227(any non zero value)