modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/930930-2.c (about) 1 int 2 test_endianness() 3 { 4 union doubleword 5 { 6 double d; 7 unsigned long u[2]; 8 } dw; 9 dw.d = 10; 10 return dw.u[0] != 0 ? 1 : 0; 11 } 12 13 int 14 test_endianness_vol() 15 { 16 union doubleword 17 { 18 volatile double d; 19 volatile long u[2]; 20 } dw; 21 dw.d = 10; 22 return dw.u[0] != 0 ? 1 : 0; 23 } 24 25 main () 26 { 27 if (test_endianness () != test_endianness_vol ()) 28 abort (); 29 exit (0); 30 }