1 /* $NetBSD: gcc_builtin_alloca.c,v 1.3 2022/06/22 19:23:18 rillig Exp $ */ 2 # 3 "gcc_builtin_alloca.c" 3 4 /* 5 * Test for the GCC builtin functions __builtin_alloca*, which unlike most 6 * other builtin functions return a pointer instead of int. 7 * 8 * https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html 9 */ 10 11 void 12 example(void) 13 { 14 char *ptr = __builtin_alloca(8); 15 ptr[4] = '4'; 16 17 char *aligned_ptr = __builtin_alloca_with_align(8, 64); 18 aligned_ptr[0] = '\0'; 19 20 /* expect+1: warning: illegal combination of pointer 'pointer to char' and integer 'int' [183] */ 21 char *unknown = __builtin_allocate(8); 22 unknown[0] = '\0'; 23 } 24