Revert "default clause replaced by otherwise clause for metadirective in OpenMP 5.2 (#125648)"

This reverts commit 73ad78c.
Breaks check-clang, see comments on
#125648

Author: nico

clang/include/clang/Basic/DiagnosticParseKinds.td

@@ -1657,10 +1657,6 @@ def err_omp_expected_colon : Error<"missing ':' in %0">;
 def err_omp_missing_comma : Error< "missing ',' after %0">;
 def err_omp_expected_context_selector
     : Error<"expected valid context selector in %0">;
-def err_omp_unknown_clause
-    : Error<"unknown clause '%0' in %1">;
-def warn_omp_default_deprecated : Warning<"'default' clause for"
-  " 'metadirective' is deprecated; use 'otherwise' instead">, InGroup<Deprecated>;
 def err_omp_requires_out_inout_depend_type : Error<
   "reserved locator 'omp_all_memory' requires 'out' or 'inout' "
   "dependency types">;

clang/lib/Parse/ParseOpenMP.cpp

@@ -2759,19 +2759,6 @@ StmtResult Parser::ParseOpenMPDeclarativeOrExecutableDirective(
       OpenMPClauseKind CKind = Tok.isAnnotation()
                                    ? OMPC_unknown
                                    : getOpenMPClauseKind(PP.getSpelling(Tok));
-      // Check if the clause is unrecognized.
-      if (getLangOpts().OpenMP < 52 &&
-          (CKind == OMPC_unknown || CKind == OMPC_otherwise)) {
-        Diag(Tok, diag::err_omp_unknown_clause)
-            << PP.getSpelling(Tok) << "metadirective";
-      }
-      if (getLangOpts().OpenMP >= 52 && CKind == OMPC_unknown) {
-        Diag(Tok, diag::err_omp_unknown_clause)
-            << PP.getSpelling(Tok) << "metadirective";
-      }
-      if (CKind == OMPC_default && getLangOpts().OpenMP >= 52) {
-        Diag(Tok, diag::warn_omp_default_deprecated);
-      }
       SourceLocation Loc = ConsumeToken();
 
       // Parse '('.
@@ -2798,13 +2785,6 @@ StmtResult Parser::ParseOpenMPDeclarativeOrExecutableDirective(
           return Directive;
         }
       }
-      if (CKind == OMPC_otherwise) {
-        // Check for 'otherwise' keyword.
-        if (Tok.is(tok::identifier) &&
-            Tok.getIdentifierInfo()->getName() == "otherwise") {
-          ConsumeToken(); // Consume 'otherwise'
-        }
-      }
       // Skip Directive for now. We will parse directive in the second iteration
       int paren = 0;
       while (Tok.isNot(tok::r_paren) || paren != 0) {

clang/test/OpenMP/metadirective_messages.cpp

@@ -2,48 +2,21 @@
 
 // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -verify -fopenmp-simd -x c++ -std=c++14 -fexceptions -fcxx-exceptions %s
 
-// RUN: %clang_cc1 -verify=expected,omp52 -fopenmp -fopenmp-version=52 -ferror-limit 100 -o - %s -Wuninitialized
-
 void foo() {
-#if _OPENMP >= 202111
-  #pragma omp metadirective // omp52-error {{expected expression}}
-    ;
-  #pragma omp metadirective when() // omp52-error {{expected valid context selector in when clause}} expected-error {{expected expression}} expected-warning {{expected identifier or string literal describing a context set; set skipped}} expected-note {{context set options are: 'construct' 'device' 'target_device' 'implementation' 'user'}} expected-note {{the ignored set spans until here}}
-    ;
-  #pragma omp metadirective when(device{}) // omp52-warning {{expected '=' after the context set name "device"; '=' assumed}} expected-warning {{expected identifier or string literal describing a context selector; selector skipped}} expected-note {{context selector options are: 'kind' 'arch' 'isa'}} expected-note {{the ignored selector spans until here}} expected-error {{expected valid context selector in when clause}} expected-error {{expected expression}}
-    ;
-  #pragma omp metadirective when(device{arch(nvptx)}) // omp52-error {{missing ':' in when clause}} expected-error {{expected expression}} expected-warning {{expected '=' after the context set name "device"; '=' assumed}}
-    ;
-  #pragma omp metadirective when(device{arch(nvptx)}: ) otherwise() // omp52-warning {{expected '=' after the context set name "device"; '=' assumed}}
-    ;
-  #pragma omp metadirective when(device = {arch(nvptx)} : ) otherwise(xyz) // omp52-error {{expected an OpenMP directive}} expected-error {{use of undeclared identifier 'xyz'}}
-    ;
-  #pragma omp metadirective when(device = {arch(nvptx)} : parallel otherwise() // omp52-error {{expected ',' or ')' in 'when' clause}} expected-error {{expected expression}}
-    ;
-  #pragma omp metadirective when(device = {isa("some-unsupported-feature")} : parallel) otherwise(single) // omp52-warning {{isa trait 'some-unsupported-feature' is not known to the current target; verify the spelling or consider restricting the context selector with the 'arch' selector further}}
-    ;
-  #pragma omp metadirective when(device = {arch(nvptx)} : parallel) default() // omp52-warning {{'default' clause for 'metadirective' is deprecated; use 'otherwise' instead}}
-    ;
-  #pragma omp metadirective when(device = {arch(nvptx)} : parallel) xyz() //omp52-error {{unknown clause 'xyz' in metadirective}} 
-    ;
-#else
-  #pragma omp metadirective // expected-error {{expected expression}}
-    ;
-  #pragma omp metadirective when() // expected-error {{expected valid context selector in when clause}} expected-error {{expected expression}} expected-warning {{expected identifier or string literal describing a context set; set skipped}} expected-note {{context set options are: 'construct' 'device' 'target_device' 'implementation' 'user'}} expected-note {{the ignored set spans until here}}
-    ;
-  #pragma omp metadirective when(device{}) // expected-warning {{expected '=' after the context set name "device"; '=' assumed}} expected-warning {{expected identifier or string literal describing a context selector; selector skipped}} expected-note {{context selector options are: 'kind' 'arch' 'isa'}} expected-note {{the ignored selector spans until here}} expected-error {{expected valid context selector in when clause}} expected-error {{expected expression}}
-    ;
-  #pragma omp metadirective when(device{arch(nvptx)}) // expected-error {{missing ':' in when clause}} expected-error {{expected expression}} expected-warning {{expected '=' after the context set name "device"; '=' assumed}}
-    ;
-  #pragma omp metadirective when(device{arch(nvptx)}: ) default() // expected-warning {{expected '=' after the context set name "device"; '=' assumed}}
-    ;
-  #pragma omp metadirective when(device = {arch(nvptx)} : ) default(xyz) // expected-error {{expected an OpenMP directive}} expected-error {{use of undeclared identifier 'xyz'}}
-    ;
-  #pragma omp metadirective when(device = {arch(nvptx)} : parallel default() // expected-error {{expected ',' or ')' in 'when' clause}} expected-error {{expected expression}}
-    ;
-  #pragma omp metadirective when(device = {isa("some-unsupported-feature")} : parallel) default(single) // expected-warning {{isa trait 'some-unsupported-feature' is not known to the current target; verify the spelling or consider restricting the context selector with the 'arch' selector further}}
-    ;
-  #pragma omp metadirective when(device = {arch(nvptx)} : parallel) xyz() //expected-error {{unknown clause 'xyz' in metadirective}} 
-    ;
-#endif
+#pragma omp metadirective // expected-error {{expected expression}}
+  ;
+#pragma omp metadirective when() // expected-error {{expected valid context selector in when clause}} expected-error {{expected expression}} expected-warning {{expected identifier or string literal describing a context set; set skipped}} expected-note {{context set options are: 'construct' 'device' 'target_device' 'implementation' 'user'}} expected-note {{the ignored set spans until here}}
+  ;
+#pragma omp metadirective when(device{}) // expected-warning {{expected '=' after the context set name "device"; '=' assumed}} expected-warning {{expected identifier or string literal describing a context selector; selector skipped}} expected-note {{context selector options are: 'kind' 'arch' 'isa'}} expected-note {{the ignored selector spans until here}} expected-error {{expected valid context selector in when clause}} expected-error {{expected expression}}
+  ;
+#pragma omp metadirective when(device{arch(nvptx)}) // expected-error {{missing ':' in when clause}} expected-error {{expected expression}} expected-warning {{expected '=' after the context set name "device"; '=' assumed}}
+  ;
+#pragma omp metadirective when(device{arch(nvptx)}: ) default() // expected-warning {{expected '=' after the context set name "device"; '=' assumed}}
+  ;
+#pragma omp metadirective when(device = {arch(nvptx)} : ) default(xyz) // expected-error {{expected an OpenMP directive}} expected-error {{use of undeclared identifier 'xyz'}}
+  ;
+#pragma omp metadirective when(device = {arch(nvptx)} : parallel default() // expected-error {{expected ',' or ')' in 'when' clause}} expected-error {{expected expression}}
+  ;
+#pragma omp metadirective when(device = {isa("some-unsupported-feature")} : parallel) default(single) // expected-warning {{isa trait 'some-unsupported-feature' is not known to the current target; verify the spelling or consider restricting the context selector with the 'arch' selector further}}
+  ;
 }