clang/test/SemaCXX/warn-dangling-local.cpp

   1 // RUN: %clang_cc1 -verify -std=c++11 %s
   2
   3 using T = int[];
   4
   5 void f() {
   6   int *p = &(int&)(int&&)0; // expected-warning {{temporary whose address is used as value of local variable 'p' will be destroyed at the end of the full-expression}}
   7
   8   int *q = (int *const &)T{1, 2, 3}; // expected-warning {{temporary whose address is used as value of local variable 'q' will be destroyed at the end of the full-expression}}
   9
  10   // FIXME: We don't warn here because the 'int*' temporary is not const, but
  11   // it also can't have actually changed since it was created, so we could
  12   // still warn.
  13   int *r = (int *&&)T{1, 2, 3};
  14
  15   // FIXME: The wording of this warning is not quite right. There are two
  16   // temporaries here: an 'int* const' temporary that points to the array, and
  17   // is lifetime-extended, and an array temporary that the pointer temporary
  18   // points to, which doesn't live long enough.
  19   int *const &s = (int *const &)T{1, 2, 3}; // expected-warning {{temporary bound to local reference 's' will be destroyed at the end of the full-expression}}
  20 }
  21
  22 // PR38355
  23 void g() {
  24   const int a[] = {a[0]};
  25   const int b[] = {a[0]};
  26 }