0023934: Compiler warnings in MS VC++ 10

Elimination of compiler warnings
- ExprIntrp: generated file ExprIntrp.tab.c and related WOK scripts removed from the sources
- ExprIntrp, StepFile: added missing declarations and casts; warnings caused by Flex and Bison code suppressed for MSVC compuler by #pragma
- OSD: dummy #includes added to files containing no code for Windows, to avoid warning on empty file
- PLib: piece of code contained in PLib_ChangeDim.gxx included explicitly in cxx and cleaned
- Other places: some casts added to avoid warnings

src/OSD/OSD_Cmailbox.c

@@ -549,4 +549,9 @@ write_mailbox(int *boxid, char *box_name, char *message, int length)
    return (0);
   }
 }
+#else
+
+// to avoid compiler warning on empty file
+#include "string.h"
+
 #endif

src/OSD/OSD_Csemaphore.c

@@ -317,4 +317,9 @@ osd_alarm_(int sec,RETSIGTYPE (*_alarm)())
 
 #endif /* __hpux  */
 
+#else
+
+// to avoid compiler warning on empty file
+#include "string.h"
+
 #endif /* WNT  */

src/OSD/OSD_Csharedmemory.c

@@ -119,4 +119,9 @@ int remove_sharedmemory(int *shmid, char *section_name)
         if (status < 0) return 0;
                    else return 1;
 }
+#else
+
+// to avoid compiler warning on empty file
+#include "string.h"
+
 #endif

src/OSD/OSD_MAllocHook.cxx

@@ -85,9 +85,11 @@ OSD_MAllocHook::CollectBySize* OSD_MAllocHook::GetCollectBySize()
 
 static long getRequestNum(void* pvData, long lRequest, size_t& theSize)
 {
+#if _MSC_VER == 1500  /* VS 2008 */
+#ifdef _DEBUG /* in Release, _CrtIsValidHeapPointer is always 1 */
   if (_CrtIsValidHeapPointer(pvData))
+#endif
   {
-#if _MSC_VER == 1500   // VS 2008
 #define nNoMansLandSize 4
     // the header struct is taken from crt/src/dbgint.h
     struct _CrtMemBlockHeader
@@ -105,8 +107,10 @@ static long getRequestNum(void* pvData, long lRequest, size_t& theSize)
     _CrtMemBlockHeader* aHeader = ((_CrtMemBlockHeader*)pvData)-1;
     theSize = aHeader->nDataSize;
     return aHeader->lRequest;
-#endif
   }
+#else
+  (void)pvData; (void)theSize; // avoid compiler warning on unused arg
+#endif
   return lRequest;
 }