[llvm-dev] Overriding macro values defined in source code

[Sudhindra kulkarni via llvm-dev]

Hi Team,
                 Consider the below C code,
#define AVAL 5
void func()
{
int a=5;
if(a==AVAL)
{
//Do something
}
else
{
//Do something else
}

}
My question is
Is it possible to override the value of AVAL through the -D option?
For eg is it possible to set the value of AVAL to 2 through -D in clang ?
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