[clang] [OpenMP][Clang] Parsing support for num_teams lower bound (PR #180608)

[Alexey Bataev via cfe-commits]

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@@ -5080,6 +5080,54 @@ bool Parser::ParseOpenMPVarList(OpenMPDirectiveKind DKind,
           Diag(Tok, diag::err_modifier_expected_colon) << "fallback";
       }
     }
+  } // Handle num_teams clause with optional lower-bound:upper-bound syntax
+  if (Kind == OMPC_num_teams && !Tok.is(tok::r_paren) &&
+      !Tok.is(tok::annot_pragma_openmp_end)) {
+    // Look ahead to detect top-level colon
+    TentativeParsingAction TPA(*this);
+    bool HasColon = false;
+    int Depth = 0;
+
+    while (!Tok.is(tok::r_paren) && !Tok.is(tok::annot_pragma_openmp_end)) {
+      if (Tok.isOneOf(tok::l_paren, tok::l_square))
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alexey-bataev wrote:

Shall tok::l_square be allowed? Also, add tests with multi-level parens (matching and non-matching)

https://github.com/llvm/llvm-project/pull/180608