clang/test/CXX/stmt.stmt/stmt.select/p3.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -Wno-unused-value -verify %std_cxx98-14 %s
   2 // RUN: %clang_cc1 -fsyntax-only -Wno-unused-value -Wc++14-compat -verify %std_cxx17- %s -DCPP17
   3
   4 int f();
   5
   6 void g() {
   7   if (int x = f()) { // expected-note 2{{previous definition}}
   8     int x; // expected-error{{redefinition of 'x'}}
   9   } else {
  10     int x; // expected-error{{redefinition of 'x'}}
  11   }
  12 }
  13
  14 void h() {
  15   if (int x = f()) // expected-note 2{{previous definition}}
  16     int x; // expected-error{{redefinition of 'x'}}
  17   else
  18     int x; // expected-error{{redefinition of 'x'}}
  19 }
  20
  21 void ifInitStatement() {
  22   int Var = 0;
  23
  24   if (int I = 0; true) {}
  25   if (Var + Var; true) {}
  26   if (; true) {}
  27 #ifdef CPP17
  28   // expected-warning@-4 {{if initialization statements are incompatible with C++ standards before C++17}}
  29   // expected-warning@-4 {{if initialization statements are incompatible with C++ standards before C++17}}
  30   // expected-warning@-4 {{if initialization statements are incompatible with C++ standards before C++17}}
  31 #else
  32   // expected-warning@-8 {{'if' initialization statements are a C++17 extension}}
  33   // expected-warning@-8 {{'if' initialization statements are a C++17 extension}}
  34   // expected-warning@-8 {{'if' initialization statements are a C++17 extension}}
  35 #endif
  36 }
  37
  38 void switchInitStatement() {
  39   int Var = 0;
  40
  41   switch (int I = 0; Var) {}
  42   switch (Var + Var; Var) {}
  43   switch (; Var) {}
  44 #ifdef CPP17
  45   // expected-warning@-4 {{switch initialization statements are incompatible with C++ standards before C++17}}
  46   // expected-warning@-4 {{switch initialization statements are incompatible with C++ standards before C++17}}
  47   // expected-warning@-4 {{switch initialization statements are incompatible with C++ standards before C++17}}
  48 #else
  49   // expected-warning@-8 {{'switch' initialization statements are a C++17 extension}}
  50   // expected-warning@-8 {{'switch' initialization statements are a C++17 extension}}
  51   // expected-warning@-8 {{'switch' initialization statements are a C++17 extension}}
  52 #endif
  53 }
  54
  55 // TODO: Better diagnostics for while init statements.
  56 void whileInitStatement() {
  57   while (int I = 10; I--); // expected-error {{expected ')'}}
  58   // expected-note@-1 {{to match this '('}}
  59   // expected-error@-2 {{use of undeclared identifier 'I'}}
  60
  61   int Var = 10;
  62   while (Var + Var; Var--) {} // expected-error {{expected ')'}}
  63   // expected-note@-1 {{to match this '('}}
  64   // expected-error@-2 {{expected ';' after expression}}
  65   // expected-error@-3 {{expected expression}}
  66 }
  67
  68 // TODO: This is needed because clang can't seem to diagnose invalid syntax after the
  69 // last loop above. It would be nice to remove this.
  70 void whileInitStatement2() {
  71   while (; false) {} // expected-error {{expected expression}}
  72   // expected-error@-1 {{expected ';' after expression}}
  73   // expected-error@-2 {{expected expression}}
  74 }