Thread: constant strings

I know there is a potential problem with doing the following due to read only memory:

Code:

char * szString = "Test";
szString[2] = 'd';

What about the following?:

Code:

void Func(char * szString) {
   szString[2] = 'd'
}

//elsewhere
char * szString = "Test";
Func(szString);
Func("Test");

Does the compiler make sure the string is not put into read only memory in this scenario or do I have to copy the string in the function. This works without problems at the moment but I thought I would check with the experts.

Thanks!