Tidy up CFLAGS, CPPFLAGS, LDFLAGS and LDLIBS output from configure

Signed-off-by: Quentin Armitage <quentin@armitage.org.uk>

configure.ac

@@ -2025,8 +2025,19 @@ if test "$enable_snmp" = yes -o \
     ]])
 
   SNMP_SUPPORT=Yes
+
+  # NETSNMP_CFLAGS can have CPPFLAGS options, so separate them
+  NETSNMP_CPPFLAGS=`echo " $NETSNMP_CFLAGS " | sed -e "s/ /  /g" -e "s/ -[[^I]] *-/ -/g" -e "s/ -[[^I]] *[[^-]][[^ ]]* / /g" -e "s/  */ /g"`
+  NETSNMP_CFLAGS=`echo " $NETSNMP_CFLAGS " | sed -e "s/ /  /g" -e "s/ -I *[[^ ]]* / /g" -e "s/  */ /g"`
   add_to_var([KA_CFLAGS], [$NETSNMP_CFLAGS])
+  add_to_var([KA_CPPFLAGS], [$NETSNMP_CPPFLAGS])
+
+  # NETSNMP_LIBS may have some LDFLAGS options, so separate them
+  NETSNMP_LDFLAGS=`echo " $NETSNMP_LIBS " | sed -e "s/ /  /g" -e "s/ -l *[[^ ]]* /  /g" -e "s/  */ /g" -e "s/ -/ @-/g" | tr "@" "\n" | sed -e "s/^  *//" -e "s/  *$//" | sort -u | tr "\n" " "`
+  NETSNMP_LIBS=`echo " $NETSNMP_LIBS " | sed -e "s/ /  /g" -e "s/ \(-l *[[^ ]]*\) /@\1@/g" | tr "@" "\n" | grep  "^-l" | tr "\n" " " | sed -e "s/  */ /g"`
+  add_to_var([KA_LDFLAGS], [$NETSNMP_LDFLAGS])
   add_to_var([KA_LIBS], [$NETSNMP_LIBS])
+
   if test "$enable_snmp_rfc" = yes; then
     SNMP_RFCV2_SUPPORT=Yes
     SNMP_RFCV3_SUPPORT=Yes
@@ -2554,6 +2565,12 @@ fi
 dnl ----[ Process output target ]----
 echo
 
+# Tidy up some strings
+KA_CPPFLAGS=`echo $KA_CPPFLAGS | sed -e "s/  */ /g" -e "s/^ //" -e "s/ $//"`
+KA_CFLAGS=`echo $KA_CFLAGS | sed -e "s/  */ /g" -e "s/^ //" -e "s/ $//"`
+KA_LDFLAGS=`echo $KA_LDFLAGS | sed -e "s/  */ /g" -e "s/^ //" -e "s/ $//"`
+KA_LIBS=`echo $KA_LIBS | sed -e "s/  */ /g" -e "s/^ //" -e "s/ $//"`
+
 AC_OUTPUT
 
 # Restore lib/config_warnings.h.in