llvm dev - Apr 2019 - Overriding macro values defined in source code

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 ?
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20190430/8abf28d9/attachment.html>

On Tue, 30 Apr 2019 at 22:28, Sudhindra kulkarni via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> 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 ?
This is more a question for the cfe-users list, but as far as I know
there's no way to prevent redefinitions in source files.

Cheers.

Tim.