Cleanup: fixed OpenMP 4.0 library build

[AndreyChurbanov]

Summary

Fixed OpenMP 4.0 library build (-DLIBOMP_OMP_VERSION=40).

[jlpeyton]

LGTM

src/kmp.h

 #if OMP_45_ENABLED
     kmp_int32                th_doacross_buf_idx; // thread's doacross buffer index
     volatile kmp_uint32     *th_doacross_flags;   // pointer to shared array of flags
     union { // we can use union here because doacross cannot be used in nonmonotonic loops
         kmp_int64           *th_doacross_info;    // info on loop bounds
         kmp_lock_t          *th_steal_lock;       // lock used for chunk stealing (8-byte variable)
     };
 #else
+#if KMP_STATIC_STEAL_ENABLED
+    kmp_lock_t              *th_steal_lock;       // lock used for chunk stealing (8-byte variable)
+    void* dummy_padding[1]; // make it 64 bytes on Intel(R) 64
+#else
     void* dummy_padding[2]; // make it 64 bytes on Intel(R) 64
 #endif
+#endif
 #if KMP_USE_INTERNODE_ALIGNMENT
     char more_padding[INTERNODE_CACHE_LINE];
 #endif
 } kmp_disp_t;
 
 /* ------------------------------------------------------------------------ */
 /* ------------------------------------------------------------------------ */
 

src/kmp_tasking.c

 //
 // gtid: Global thread ID of calling thread
 // taskdata: task to free
 // thread: thread data structure of caller
 
 static void
 __kmp_free_task_and_ancestors( kmp_int32 gtid, kmp_taskdata_t * taskdata, kmp_info_t * thread )
 {
+#if OMP_45_ENABLED
     // Proxy tasks must always be allowed to free their parents
     // because they can be run in background even in serial mode.
     kmp_int32 task_serial = taskdata->td_flags.task_serial && !taskdata->td_flags.proxy;
+#else
+    kmp_int32 task_serial = taskdata->td_flags.task_serial;
+#endif
     KMP_DEBUG_ASSERT( taskdata -> td_flags.tasktype == TASK_EXPLICIT );
 
     kmp_int32 children = KMP_TEST_THEN_DEC32( (kmp_int32 *)(& taskdata -> td_allocated_child_tasks) ) - 1;
     KMP_DEBUG_ASSERT( children >= 0 );
 
     // Now, go up the ancestor tree to see if any ancestors can now be freed.
     while ( children == 0 )
     {