libCom/test: Suppress g++ build warnings from epicsCalcTest

Newer versions of gcc support #pragma GCC diagnostic

src/libCom/test/epicsCalcTest.cpp

@@ -224,6 +224,14 @@ static inline double MIN(double a, double b, double c, double d, double e,
     return MIN(MIN(a,b,c,d,e,f,g,h,i,j,k),l);
 }
 
+/* The test code below generates lots of spurious warnings because
+ * it's making sure that our operator priorities match those of C.
+ * Disable them to quieten the compilation process where possible.
+ */
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)
+#  pragma GCC diagnostic ignored "-Wparentheses"
+#endif
+
 MAIN(epicsCalcTest)
 {
     int repeat;