[svn-r22879] Bug Fix: HDFFV 8017

dt_arith would fail in Lion and Mountain Lion system when GCC version 4.2.1
is used with --enable-production. Somehow the -O optimization will fail some of
the hard conversion code.

Solution:
This is just a temporary patch by detecting if this is a Lion or Mountain Lion
system using GCC 4.2.1, then just remove the any -O option from the PROD_CFLAGS.
A better fix should be deviced later.

Tested: Duck(lion) and Owl (mountain lion) tested with --enable-production.
Also tested in Fred and Tejeda, both Snow Leopard systems to verify there is
no undesired side effect.

config/apple

@@ -28,6 +28,22 @@ fi
 
 # Figure out compiler flags
 . $srcdir/config/gnu-flags
+# temp patch: if GCC 4.2.1 is used in Lion or Mountain Lion systems, do not
+# use -O option as it causes failures in test/dt_arith.
+#echo host_os=$host_os
+case "$host_os" in
+    darwin1[12].*)   # lion & mountain lion
+	#echo cc_vendor=$cc_vendor'-'cc_version=$cc_version
+	case "$cc_vendor-$cc_version" in
+	    gcc-4.2.1)
+		# Remove any -O flags
+		#echo PROD_CFLAGS=$PROD_CFLAGS
+		PROD_CFLAGS="`echo $PROD_CFLAGS | sed -e 's/-O[0-3]*//'`"
+		#echo new PROD_CFLAGS=$PROD_CFLAGS
+		;;
+	esac
+	;;
+esac
  
 . $srcdir/config/intel-flags
 if test "X-" = "X-$FC"; then