How to check if macro is defined and its value is true in C

I am working on a project that has multiple products and they all share the same code base. Each product has a product_XXX.h file associated with it that use #define directive to define macros. I would like to introduce a new macro for a single product only.
For example:

#define FANCY_FEATURE 1

In other words, I don't want to add this to all the other products and set it to zero.

Now in the code, in order for it to compile for all the projects, I need to check if it is defined. I also want to check and make sure FANCY_FEATURE is set to 1. How can I do these two steps at once.

#if defined (FANCY_FEATURE) && (FANCY_FEATURE) came to my mind but I wasn't sure about the order of execution (e.g.: right hand side being evaluated first) and if it would generate an error using different compilers.

Just write #if A.

Short demo program:

#include <stdio.h>
// Try all 3 variants:
#define A 1
//#define A 0
//#undef A
int main()
{
#if defined(A) && A
  printf("defined(A) && A\n");
#endif
#if A
    printf("#if A\n");
#endif
}