gcc compila tanto C como C++. Por lo tanto, anda... Pero no es C.
	De: https://en.cppreference.com/w/c/language/array_initialization
	Y: https://stackoverflow.com/questions/201101/how-to-initialize-all-members-of-an-array-to-the-same-value

No falla, solo restringe a cierta sintaxis:
	gcc -ansi -std=c89 -o arreglo_init arreglo_init.c

Falla con sintaxis de C++:
	gcc -Wall -pedantic-errors arreglo_init.c

https://stackoverflow.com/questions/201101/how-to-initialize-all-members-of-an-array-to-the-same-value
    Don't overlook the obvious solution, though:
        int myArray[10] = { 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 };
    Elements with missing values will be initialized to 0:
        int myArray[10] = { 1, 2 }; // initialize to 1,2,0,0,0...
    So this will initialize all elements to 0:
        int myArray[10] = { 0 }; // all elements 0
    In C++, an empty initialization list will also initialize every element to 0. This is not allowed with C:
        int myArray[10] = {}; // all elements 0 in C++
    Remember that objects with static storage duration will initialize to 0 if no initializer is specified:
        static int myArray[10]; // all elements 0

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Otros modificadores:

-ansi
	Modo ANSI/ISO C (no usa cosas especificas de GNU)
-std=c89
	Pueden configurarse los distintos estándar de C
-pedantic
	Todas las advertencias de ANSI/ISO C
-pedantic-errors
	Lo mismo pero toma las advertencias como errores
-traditional
	Apoyo de sintaxis de C de Kernighan & Ritchie 

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Para por ejemplo evitar optimizaciones (y que "reviente" una funcion recursiva):
    gcc -O0 -o ej ej-fact-stack.c
        (ver files/clase07/RECUR3b_Factorial_RecursivoStack-MasConsumo.c)

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Variable Length Arrays in C and C++
    De: https://www.geeksforgeeks.org/variable-length-arrays-in-c-and-c/
        void fun(int n) {
            int arr[n];
            // ......
        }

    Variable length arrays is a feature where we can allocate an auto array (on stack) of variable size. C supports variable sized arrays from C99 standard.
    Also note that in C99 or C11 standards, there is feature called “flexible array members” (https://en.wikipedia.org/wiki/Flexible_array_member), which works same as the above.

Esto da error si compilamos con:
    gcc -Wall -std=c89 -pedantic-errors -o prog mi_variable_array.c