TheRock/compiler/amd-llvm/clang/test/AST/ByteCode/builtins.c

// RUN: %clang_cc1 -fexperimental-new-constant-interpreter %s -verify=expected,both
// RUN: %clang_cc1                                         %s -verify=ref,both

extern __SIZE_TYPE__ strlen(const char *);

struct str_t {
  char s1[sizeof("a")];
};
static const struct str_t str1 = {"a"};
#define str ((const char *)&str1)
int structStrlen(void) {
  if (strlen(str) == 1)
    return 0;
  return 1;
}

void f() { __builtin_memcpy(f, f, 1); }
void f2()  { __builtin_memchr(f2, 0, 1); }


_Static_assert(__atomic_is_lock_free(4, (void*)2), ""); // both-error {{not an integral constant expression}}

_Static_assert(__builtin_strlen((void*)0 + 1) == 2, ""); // both-error {{not an integral constant expression}} \
                                                         // both-note {{cannot perform pointer arithmetic on null pointer}}


int strcmp(const char *, const char *);
#define S "\x01\x02"

const char _str[] = {S[0], S[1]};
const union u {
  int a;
  char b[2];
} _str2[] = {S[0], S[1]};

const int compared = strcmp(_str, (const char *)_str2); // both-error {{initializer element is not a compile-time constant}}

int ptrint = __builtin_bswap64("") == 0x1234 ? 1 : 0; // both-error {{incompatible pointer to integer conversion}} \
                                                      // both-error {{initializer element is not a compile-time constant}}