[Flang][OpenMP] Add TODO message for copyprivate clause

[kiranchandramohan]

Summary

The copyprivate clause is not yet implemented. Provide a TODO
error message when this clause is seen.

[NimishMishra]

LG

flang/lib/Lower/OpenMP.cpp

genOMP(Fortran::lower::AbstractConverter &converter,
   cp.processFinal(stmtCtx, finalClauseOperand);
   cp.processUntied(untiedAttr);
   cp.processMergeable(mergeableAttr);
   cp.processPriority(stmtCtx, priorityClauseOperand);
   cp.processReduction(currentLocation, reductionVars, reductionDeclSymbols);
   cp.processDepend(dependTypeOperands, dependOperands);
 
   for (const Fortran::parser::OmpClause &clause : opClauseList.v) {
+    mlir::Location clauseLocation = converter.genLocation(clause.source);
     if (!std::get_if<Fortran::parser::OmpClause::If>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::NumThreads>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::ProcBind>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::Allocate>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::Default>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::Final>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::Untied>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::Mergeable>(&clause.u) &&
if (!std::get_if<Fortran::parser::OmpClause::If>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::Threads>(&clause.u) &&
         // Map, UseDevicePtr, UseDeviceAddr and ThreadLimit clauses are
         // exclusive to Target directives. They are handled as part of the
         // TargetOp creation.
         !std::get_if<Fortran::parser::OmpClause::Map>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::UseDevicePtr>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::UseDeviceAddr>(&clause.u) &&
         !std::get_if<Fortran::parser::OmpClause::ThreadLimit>(&clause.u)) {
-      TODO(converter.getCurrentLocation(), "OpenMP Block construct clause");
+      TODO(clauseLocation, "OpenMP Block construct clause");
     }
   }
 
   ClauseProcessor(converter,
                   std::get<Fortran::parser::OmpClauseList>(endBlockDirective.t))
       .processNowait(nowaitAttr);
+  for (const auto &clause :
+       std::get<Fortran::parser::OmpClauseList>(endBlockDirective.t).v) {
+    mlir::Location clauseLocation = converter.genLocation(clause.source);
+    if (!std::get_if<Fortran::parser::OmpClause::Nowait>(&clause.u))
+      TODO(clauseLocation, "OpenMP Block construct clause");
+  }
 
   if (blockDirective.v == llvm::omp::OMPD_parallel) {
     // Create and insert the operation.
     auto parallelOp = firOpBuilder.create<mlir::omp::ParallelOp>(
         currentLocation, argTy, ifClauseOperand, numThreadsClauseOperand,
         allocateOperands, allocatorOperands, reductionVars,
         reductionDeclSymbols.empty()
             ? nullptr

flang/test/Lower/OpenMP/Todo/copyprivate.f90

+! RUN: %not_todo_cmd bbc -emit-fir -fopenmp -o - %s 2>&1 | FileCheck %s
+! RUN: %not_todo_cmd %flang_fc1 -emit-fir -fopenmp -o - %s 2>&1 | FileCheck %s
+
+! CHECK: not yet implemented: OpenMP Block construct clause
+subroutine sb
+  integer, save :: a
+  !$omp threadprivate(a)
+  !$omp parallel
+  !$omp single
+  a = 3
+  !$omp end single copyprivate(a)
+  !$omp end parallel
+end subroutine