[OMPT] Make omp_control_tool() compliant when called from Fortran pro…

…grams

This change fixes an incorrect behavior of the omp_control_tool function when
called from Fortran applications.  A tool callback function for this event is
supposed to get NULL for the third argument according to the specification, but
the current implementation just passes a garbage value. A possible fix is to use
the OPTIONAL attribute for the third argument.

Patch by Hansang Bae

Differential Revision: https://reviews.llvm.org/D50565

llvm-svn: 339585

openmp/runtime/src/include/50/omp_lib.f90.var

@@ -531,11 +531,12 @@
             integer (kind=omp_lock_hint_kind), value :: hint
           end subroutine omp_init_nest_lock_with_hint
 
-          function omp_control_tool(command, modifier) bind(c)
+          function omp_control_tool(command, modifier, arg) bind(c)
             use omp_lib_kinds
             integer (kind=omp_integer_kind) omp_control_tool
             integer (kind=omp_control_tool_kind), value :: command
             integer (kind=omp_control_tool_kind), value :: modifier
+            integer (kind=kmp_pointer_kind), optional :: arg
           end function omp_control_tool
 
         end interface

openmp/runtime/src/include/50/omp_lib.h.var

@@ -506,11 +506,12 @@
           integer (kind=omp_lock_hint_kind), value :: hint
         end subroutine omp_init_nest_lock_with_hint
 
-        function omp_control_tool(command, modifier) bind(c)
+        function omp_control_tool(command, modifier, arg) bind(c)
           import
           integer (kind=omp_integer_kind) omp_control_tool
           integer (kind=omp_control_tool_kind), value :: command
           integer (kind=omp_control_tool_kind), value :: modifier
+          integer (kind=kmp_pointer_kind), optional :: arg
         end function omp_control_tool
 
       end interface