[OpenACC] Elaborate testcases that verify column location information [PR92793]

After PR92793 commit 9c81750c "Fortran] PR
92793 - fix column used for error diagnostic", commit
d0d0ba20 did "Add tests to verify OpenACC
clause locations", later fixed up in PR92901 commit
e6c90dba to "Fix PR92901: Change test
expectation for C++ in OpenACC test clause-locations.c".

Now, add some more testing to verify/document the status quo.

	gcc/testsuite/
	PR fortran/92793
	* c-c++-common/goacc/clause-locations.c: Rewrite into...
	* c-c++-common/goacc/pr92793-1.c: ... this.
	* gfortran.dg/goacc/clause-locations.f90: Rewrite into...
	* gfortran.dg/goacc/pr92793-1.f90: ... this.

gcc/testsuite/c-c++-common/goacc/clause-locations.c

-/* Verify that the location information for clauses is correct. */
-
-void
-check_clause_columns() {
-  int i, j, sum, diff;
-
-  #pragma acc parallel
-  {
-    #pragma acc loop reduction(+:sum)
-    for (i = 1; i <= 10; i++)
-      {
-        #pragma acc loop reduction(-:diff) reduction(-:sum)
-	/* { dg-warning "53: conflicting reduction operations for .sum." "" { target c } .-1 } */
-	/* { dg-warning "56: conflicting reduction operations for .sum." "" { target c++ } .-2 } */
-	for (j = 1; j <= 10; j++)
-	  sum = 1;
-      }
-  }
-}

gcc/testsuite/c-c++-common/goacc/pr92793-1.c

+/* Verify column location information.  */
+
+/* See also 'gfortran.dg/goacc/pr92793-1.f90'.  */
+
+/* { dg-additional-options "-fdump-tree-original-lineno" }, and also
+   { dg-additional-options "-fdump-tree-gimple-lineno" } as the former doesn't
+   actually contain location information.  */
+
+/* No tabs.  Funny indentation/spacing for a reason.  */
+
+
+static void
+check ()
+{
+  int i, j, sum, diff;
+
+ #pragma   acc  parallel \
+  /* C, C++ location information points to the 'a' in '#pragma acc parallel'.  */ \
+  /* { dg-final { scan-tree-dump-times "pr92793-1\\\.c:17:12\\\] #pragma acc parallel" 1 "original" { xfail *-*-* } } } */ \
+  /* { dg-final { scan-tree-dump-times "pr92793-1\\\.c:17:12\\\] #pragma omp target oacc_parallel" 1 "gimple" } } */
+  {
+#pragma     acc loop \
+  /* C, C++ location information points to the 'a' in '#pragma acc loop'.  */ \
+  /* { dg-final { scan-tree-dump-times "pr92793-1\\\.c:22:13\\\] #pragma acc loop" 1 "original" { xfail *-*-* } } } */ \
+  /* { dg-final { scan-tree-dump-times "pr92793-1\\\.c:22:13\\\] #pragma acc loop" 1 "gimple" } } */ \
+       reduction  (  + :   sum) /* { dg-line sum1 } */ \
+  /* C location information points to the '(' in 'reduction(+:sum)'.  */ \
+  /* { dg-message "19: location of the previous reduction for 'sum'" "" { target c } sum1 } */ \
+  /* C++ location information points to 'sum' in 'reduction(+:sum)'.  */ \
+  /* { dg-message "28: location of the previous reduction for 'sum'" "" { target c++ } sum1 } */ \
+  independent
+    for (i = 1; i <= 10; i++)
+      {
+     #pragma      acc     loop \
+  /* C, C++ location information points to the 'a' in '#pragma acc loop'.  */ \
+  /* { dg-final { scan-tree-dump-times "pr92793-1\\\.c:34:19\\\] #pragma acc loop" 1 "original" { xfail *-*-* } } } */ \
+  /* { dg-final { scan-tree-dump-times "pr92793-1\\\.c:34:19\\\] #pragma acc loop" 1 "gimple" } } */ \
+ reduction  ( -  : diff  ) \
+reduction(-:sum  ) /* { dg-line sum2 } */ \
+  /* C location information points to the '(' in 'reduction(-:sum)'.  */ \
+  /* { dg-warning "10: conflicting reduction operations for 'sum'" "" { target c } sum2 } */ \
+  /* C++ location information points to 'sum' in 'reduction(-:sum)'.  */ \
+  /* { dg-warning "13: conflicting reduction operations for 'sum'" "" { target c++ } sum2 } */ \
+  independent
+        for (j = 1; j <= 10; j++)
+          {
+                sum
+                  =
+             1 ;
+            /* C, C++ location information points to the '=' in 'sum = 1'.  */ \
+            /* { dg-final { scan-tree-dump-times "pr92793-1\\\.c:48:19\\\] sum = 1" 1 "original" { xfail *-*-* } } } */ \
+            /* { dg-final { scan-tree-dump-times "pr92793-1\\\.c:48:19\\\] sum = 1" 1 "gimple" } } */
+          }
+      }
+  }
+}

gcc/testsuite/gfortran.dg/goacc/clause-locations.f90

-! Verify that the location information for clauses is correct.
-! See also PR 92793.
-
-subroutine check_clause_columns ()
-  implicit none (type, external)
-  integer :: i, j, sum, diff
-
-  !$acc parallel
-    !$acc loop reduction(+:sum)
-    do i = 1, 10
-      !$acc loop reduction(-:diff) reduction(-:sum)  ! { dg-warning "47: conflicting reduction operations for .sum." }
-      do j = 1, 10
-            sum = 1
-      end do
-    end do
-  !$acc end parallel
-end subroutine check_clause_columns
-

gcc/testsuite/gfortran.dg/goacc/pr92793-1.f90

+! Verify column location information.
+
+! See also 'c-c++-common/goacc/pr92793-1.c'.
+
+! { dg-additional-options "-fdump-tree-original-lineno" }
+! { dg-additional-options "-fdump-tree-gimple-lineno" }
+
+! No tabs.  Funny indentation/spacing for a reason.
+
+
+subroutine check ()
+  implicit none (type, external)
+  integer :: i, j, sum, diff
+
+ !$acc    parallel &
+     !$acc & & ! Fortran location information points to the last line of the directive, and there is no column location information.
+!$acc  && ! { dg-final { scan-tree-dump-times "pr92793-1\\\.f90:18:0\\\] #pragma acc parallel" 1 "original" } }
+  !$acc & ! { dg-final { scan-tree-dump-times "pr92793-1\\\.f90:18:0\\\] #pragma omp target oacc_parallel" 1 "gimple" } }
+      !$acc loop &
+    !$acc & & ! Fortran location information points to the last line of the directive, and there is no column location information.
+      !$acc  &   & ! { dg-final { scan-tree-dump-times "pr92793-1\\\.f90:26:0\\\] #pragma acc loop" 1 "original" } }
+     !$acc &     & ! { dg-final { scan-tree-dump-times "pr92793-1\\\.f90:26:0\\\] #pragma acc loop" 1 "gimple" } }
+    !$acc&       reduction  ( +    : sum ) & ! { dg-line sum1 }
+ !$acc && ! Fortran location information points to the ':' in 'reduction(+:sum)'.
+   !$acc   &    &  ! { dg-message "36: location of the previous reduction for 'sum'" "" { target *-*-* } sum1 }
+!$acc&     independent
+  do i = 1, 10
+      !$acc loop &
+!$acc & & ! Fortran location information points to the last line of the directive, and there is no column location information.
+   !$acc & & ! { dg-final { scan-tree-dump-times "pr92793-1\\\.f90:36:0\\\] #pragma acc loop" 1 "original" } }
+    !$acc & & ! { dg-final { scan-tree-dump-times "pr92793-1\\\.f90:36:0\\\] #pragma acc loop" 1 "gimple" } }
+  !$acc & reduction(-: diff     ) &
+             !$acc&reduction(- :    sum) & ! { dg-line sum2 }
+            !$acc & & ! Fortran location information points to the ':' in 'reduction(-:sum)'.
+          !$acc& & ! { dg-warning "32: conflicting reduction operations for 'sum'" "" { target *-*-* } sum2 }
+          !$acc       &independent
+     do j = 1, 10
+           sum &
+   & = &
+      & 1
+        ! Fortran location information points to the last line of the statement, and there is no column location information.
+        ! { dg-final { scan-tree-dump-times "pr92793-1\\\.f90:40:0\\\] sum = 1" 1 "original" } }
+        ! { dg-final { scan-tree-dump-times "pr92793-1\\\.f90:40:0\\\] sum = 1" 1 "gimple" } }
+     end do
+  end do
+!$acc end  parallel
+end subroutine check