[llvm-bugs] [Bug 46347] New: An iteration of a loop execute more than one ordered region which throw an error

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https://bugs.llvm.org/show_bug.cgi?id=46347

            Bug ID: 46347
           Summary: An iteration of a loop execute more than one ordered
                    region which throw an error
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Clang Compiler Support
          Assignee: unassignedclangbugs at nondot.org
          Reporter: yangzh.fnst at cn.fujitsu.com
                CC: llvm-bugs at lists.llvm.org

Hi,

Follow the OpenMP's Specfications:
During execution of an iteration of a worksharing-loop or a loop nest within a
worksharing-loop, simd, or worksharing-loop SIMD region, a thread must not
execute more than one ordered region corresponding to an ordered construct
without a depend clause.
https://www.openmp.org/spec-html/5.0/openmpsu97.html#x128-5010002.17.9

The following code shoule be error. But there is no error.

Example_ordered.2.c: This code comes from 
https://www.openmp.org/wp-content/uploads/openmp-examples-5.0.0.pdf

void work(int i) {}

void ordered_wrong(int n)
{
  int i;
  #pragma omp for ordered
  for (i=0; i<n; i++) {
/* incorrect because an iteration may not execute more than one
   ordered region */
    #pragma omp ordered
      work(i);
    #pragma omp ordered
      work(i+1);
  }
}

clang version: clang10.0.0
command:
clang -fopenmp -S test.c

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