How can I compile C code using anonymous structs and unions?

Compiling C Code with Anonymous Structs and Unions

To compile C code with anonymous structs and unions, consider employing GNU C's unnamed field extension enabled via the -fms-extensions compiler flag.

Implementation:

<code class="c">typedef struct {
    union {
        struct {
            float x, y, z;
        };
        float xyz[3];
    };
} Vector3;</code>

Compilation:

<code class="sh">gcc -fms-extensions my_code.c</code>

Usage:

<code class="c">Vector3 v;
assert(&v.xyz[0] == &v.x);
assert(&v.xyz[1] == &v.y);
assert(&v.xyz[2] == &v.z);</code>

Explanation:

The -fms-extensions flag enables the use of unnamed fields in structs and unions, allowing anonymous structs to be used as outlined in the original question. By using this flag, the compiler will recognize the anonymous struct within the union and properly associate the elements of the struct with the elements of the array xyz.

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