a fix for use of posix isnan() function

src/libCom/Makefile

@@ -134,6 +134,7 @@ INC += epicsMutex.h
 INC += osdMutex.h
 INC += epicsEvent.h
 INC += osdEvent.h
+INC += epicsMath.h
 
 INC += epicsAssert.h
 INC += epicsFindSymbol.h
@@ -205,7 +206,6 @@ SRCS_RTEMS += rtems_util.c
 # For vxWorks a clock
 INC_vxWorks += iocClock.h
 SRCS_vxWorks += iocClock.c
-SRCS_vxWorks += isnan.c
 
 #       Library to build:
 #       lib$(LIBRARY).a  or   ..dll/..exp/..lib

src/libCom/calc/sCalcPerform.c

@@ -66,6 +66,7 @@
 
 #include	"dbDefs.h"
 #define epicsExportSharedSymbols
+#include    "epicsMath.h"
 #include	"cvtFast.h"
 #include	"sCalcPostfix.h"
 #include	"sCalcPostfixPvt.h"
@@ -141,7 +142,7 @@ static void to_string(struct stackElement *ps)
 {
 	ps->s = calloc(20, 1);
 	/* any precision greater than 8 results in (slow) sprintf call */
-	if (isnan(ps->d))
+	if (epicsIsNAN(ps->d))
 		strcpy(ps->s,"NaN");
 	else
 		(void)cvtDoubleToString(ps->d, ps->s, 8);
@@ -636,7 +637,7 @@ printf(") \n");
 #endif
 		*presult = *pd;
 		if (psresult && (lenSresult > 15)) {
-			if (isnan(*pd))
+			if (epicsIsNAN(*pd))
 				strcpy(psresult,"NaN");
 			else
 				(void)cvtDoubleToString(*pd, psresult, 8);

src/libCom/osi/os/WIN32/epicsMath.h

@@ -0,0 +1,9 @@
+
+#ifndef epicsMathh
+#define epicsMathh
+
+#include "float.h"
+
+#define epicsIsNAN(D) _isnan(D)
+
+#endif /* epicsMathh */

src/libCom/osi/os/posix/epicsMath.h

@@ -0,0 +1,9 @@
+
+#ifndef epicsMathh
+#define epicsMathh
+
+#include "math.h"
+
+#define epicsIsNAN(D) isnan(D)
+
+#endif /* epicsMathh

src/libCom/osi/os/vxWorks/epicsMath.h

@@ -0,0 +1,9 @@
+
+#ifndef epicsMathh
+#define epicsMathh
+
+#include <private/mathP.h>
+
+#define epicsIsNAN(D) isNan(D)
+
+#endif /* epicsMathh */

src/libCom/osi/os/vxWorks/isnan.c

@@ -1,8 +0,0 @@
-int isnan(double d)
-{
-        union { long l[2]; double d; } u;
-        u.d = d;
-        if ((u.l[0] & 0x7ff00000) != 0x7ff00000) return(0);
-        if (u.l[1] || (u.l[0] & 0x000fffff)) return(1);
-        return(0);
-}