Lit C++11 Compatibility - Parse OpenMP

[tigerleapgorge]

Summary

I am continuing to make out Lit tests C++11 compatible.
There are two tests in this patch.
Both tests verify parse errors with ill formed OpenMP expressions.

test/OpenMP/declare_reduction_messages.cpp

In C++11, an opening square bracket is the start of a lambda capture.
Therefore, a unmatched opening square bracket will cause the following diagnostics change.
  C++98: error: expected '(' after 'initializer'
         error: expected expression
         warning: extra tokens at the end of '#pragma omp declare reduction' are ignored [-Wextra-tokens]
  C++11: error: expected '(' after 'initializer'
         error: expected variable name or 'this' in lambda capture list
         error: expected ')'
         note: to match this '('

test/OpenMP/openmp_check.cpp

This test is created in response to bug 25221, where C++11 code running under C++98 causes the parser to go into an infinite loop.
Since this is C++11 code, all expected diagnostics will go away when compiling at C++11.
Therefore, guard all of the following diagnostics under C++98.
  C++98: warning: 'auto' type specifier is a C++11 extension [-Wc++11-extensions]
         error: expected expression
         error: expected ';' at end of declaration
  C++98: error: C++ requires a type specifier for all declarations
  C++98: error: expected unqualified-id
  C++98: error: extraneous closing brace ('}')

[ABataev]

LG

test/OpenMP/declare_reduction_messages.cpp

 // RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 %s
+// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 -std=c++98 %s
+// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 -std=c++11 %s
 
 int temp; // expected-note 7 {{'temp' declared here}}
 
 #pragma omp declare reduction                                              // expected-error {{expected '(' after 'declare reduction'}}
 #pragma omp declare reduction {                                            // expected-error {{expected '(' after 'declare reduction'}}
 #pragma omp declare reduction(                                             // expected-error {{expected identifier or one of the following operators: '+', '-', '*', '&', '|', '^', '&&', or '||'}}
 #pragma omp declare reduction(#                                            // expected-error {{expected identifier or one of the following operators: '+', '-', '*', '&', '|', '^', '&&', or '||'}}
 #pragma omp declare reduction(/                                            // expected-error {{expected identifier or one of the following operators: '+', '-', '*', '&', '|', '^', '&&', or '||'}}

 class Class2 : public Class1<T> {
 #pragma omp declare reduction(fun : T : omp_out += omp_in)
 };
 
 #pragma omp declare reduction(fun222 : long : omp_out += omp_in)                                        // expected-note {{previous definition is here}}
 #pragma omp declare reduction(fun222 : long : omp_out += omp_in)                                        // expected-error {{redefinition of user-defined reduction for type 'long'}}
 #pragma omp declare reduction(fun1 : long : omp_out += omp_in) initializer                              // expected-error {{expected '(' after 'initializer'}}
 #pragma omp declare reduction(fun2 : long : omp_out += omp_in) initializer {                            // expected-error {{expected '(' after 'initializer'}} expected-error {{expected expression}} expected-warning {{extra tokens at the end of '#pragma omp declare reduction' are ignored}}
-#pragma omp declare reduction(fun3 : long : omp_out += omp_in) initializer[                             // expected-error {{expected '(' after 'initializer'}} expected-error {{expected expression}} expected-warning {{extra tokens at the end of '#pragma omp declare reduction' are ignored}}
+#pragma omp declare reduction(fun3 : long : omp_out += omp_in) initializer[
+#if __cplusplus <= 199711L
+// expected-error@-2 {{expected '(' after 'initializer'}}
+// expected-error@-3 {{expected expression}}
+// expected-warning@-4 {{extra tokens at the end of '#pragma omp declare reduction' are ignored}}
+#else
+// expected-error@-6 {{expected '(' after 'initializer'}}
+// expected-error@-7 {{expected variable name or 'this' in lambda capture list}}
+// expected-error@-8 {{expected ')'}}
+// expected-note@-9 {{to match this '('}}
+#endif
 #pragma omp declare reduction(fun4 : long : omp_out += omp_in) initializer()                            // expected-error {{expected expression}}
 #pragma omp declare reduction(fun5 : long : omp_out += omp_in) initializer(temp)                        // expected-error {{only 'omp_priv' or 'omp_orig' variables are allowed in initializer expression}}
 #pragma omp declare reduction(fun6 : long : omp_out += omp_in) initializer(omp_orig                     // expected-error {{expected ')'}} expected-note {{to match this '('}}
 #pragma omp declare reduction(fun7 : long : omp_out += omp_in) initializer(omp_priv Class1 < int > ())  // expected-error {{expected ')'}} expected-note {{to match this '('}}
 #pragma omp declare reduction(fun77 : long : omp_out += omp_in) initializer(omp_priv Class2 < int > ()) // expected-error {{expected ')'}} expected-note {{to match this '('}}
 #pragma omp declare reduction(fun8 : long : omp_out += omp_in) initializer(omp_priv 23)                 // expected-error {{expected ')'}} expected-note {{to match this '('}}
 #pragma omp declare reduction(fun88 : long : omp_out += omp_in) initializer(omp_priv 23))               // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-warning {{extra tokens at the end of '#pragma omp declare reduction' are ignored}}
 #pragma omp declare reduction(fun9 : long : omp_out += omp_priv) initializer(omp_in = 23)               // expected-error {{use of undeclared identifier 'omp_priv'; did you mean 'omp_in'?}} expected-note {{'omp_in' declared here}}

test/OpenMP/openmp_check.cpp

 // RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 %s
+// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 -std=c++98 %s
+// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 -std=c++11 %s
+
 int nested(int a) {
 #pragma omp parallel
   ++a;
 
-  auto F = [&]() { // expected-error {{expected expression}} expected-error {{expected ';' at end of declaration}} expected-warning {{'auto' type specifier is a C++11 extension}}
+  auto F = [&]() {
+#if __cplusplus <= 199711L
+  // expected-warning@-2 {{'auto' type specifier is a C++11 extension}}
+  // expected-error@-3 {{expected expression}}
+  // expected-error@-4 {{expected ';' at end of declaration}}
+#else
+  // expected-no-diagnostics
+#endif
+
 #pragma omp parallel
     {
 #pragma omp target
       ++a;
     }
   };
-  F(); // expected-error {{C++ requires a type specifier for all declarations}}
-  return a; // expected-error {{expected unqualified-id}}
-}// expected-error {{extraneous closing brace ('}')}}
+  F();
+#if __cplusplus <= 199711L
+  // expected-error@-2 {{C++ requires a type specifier for all declarations}}
+#endif
+  return a;
+#if __cplusplus <= 199711L
+  // expected-error@-2 {{expected unqualified-id}}
+#endif
+}
+#if __cplusplus <= 199711L
+// expected-error@-2 {{extraneous closing brace ('}')}}
+#endif