clang/test/SemaTemplate/instantiation-depth-defarg.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify -ftemplate-depth 128 -ftemplate-backtrace-limit 4 %s
   2
   3 template<int N> struct S {
   4   typedef typename S<N-1>::type type;
   5   static int f(int n = S<N-1>::f()); // \
   6 // expected-error{{recursive template instantiation exceeded maximum depth of 128}} \
   7 // expected-note 3 {{instantiation of default function argument}} \
   8 // expected-note {{skipping 125 contexts in backtrace}} \
   9 // expected-note {{use -ftemplate-depth=N to increase recursive template instantiation depth}}
  10
  11 };
  12 template<> struct S<0> {
  13   typedef int type;
  14 };
  15
  16 // Incrementally instantiate up to S<2048>.
  17 template struct S<128>;
  18 template struct S<256>;
  19 template struct S<384>;
  20 template struct S<512>;
  21 template struct S<640>;
  22 template struct S<768>;
  23 template struct S<896>;
  24 template struct S<1024>;
  25 template struct S<1152>;
  26 template struct S<1280>;
  27 template struct S<1408>;
  28 template struct S<1536>;
  29 template struct S<1664>;
  30 template struct S<1792>;
  31 template struct S<1920>;
  32 template struct S<2048>;
  33
  34 // Check that we actually bail out when we hit the instantiation depth limit for
  35 // the default arguments.
  36 void g() { S<2048>::f(); } // expected-note {{required here}}