[cfe-dev] Recovering extent expressions

[Timothy McClory]

Consider the program:

#define m 1
#define n 2

int a[m*n];
int main() {
   return a[0];
}

How can I determine whether or not an array extent is an expression of macro
constants, and how can I retrieve this expression?
During AST traversal, I encounter a VarDecl whose type is ConstantArrayType,
but the size of this type has already been reduced to single integer.
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