source: src/tests/gccExtensions.c @ 2f22cc4

int main(int argc, char const *argv[]) {
        asm( "nop" );
        __asm( "nop" );
        __asm__( "nop" );

        __complex__ c1;
        _Complex c2;

        const int i1;
        __const int i2;
        __const__ int i3;

        __extension__ const int ex;
        struct S {
                __extension__ int a, b, c;
        };
        int i = __extension__ 3;
        __extension__ int a, b, c;
        __extension__ a, __extension__ b, __extension__ c;
        __extension__ a = __extension__ b + __extension__ c;
        __extension__ a = __extension__ ( __extension__ b + __extension__ c );

        __inline int f1() {}
        __inline__ int f2() {}

        __signed s1;
        __signed s2;

        __typeof(s1) t1;
        __typeof__(s1) t2;

        __volatile int v1;
        __volatile__ int v2;

        __attribute__(()) int a1;
        const __attribute(()) int a2;
        const static __attribute(()) int a3;
        const static int __attribute(()) a4;
        const static int a5 __attribute(());
        const static int a6, __attribute(()) a7;

        int * __attribute(()) p1;
        int (* __attribute(()) p2);
//      int (__attribute(()) (p3));
//      int ( __attribute(()) (* __attribute(()) p4));

        struct __attribute(()) s1;
        struct __attribute(()) s2 { int i; };
        struct __attribute(()) s3 { int i; } x1, __attribute(()) y1;
        struct __attribute(()) s4 { int i; } x2, y2 __attribute(());

        int m1 [10] __attribute(());
        int m2 [10][10] __attribute(());
        int __attribute(()) m3 [10][10];
//      int ( __attribute(()) m4 [10] )[10];

        return 0;
}