configure: added --enable-fulldebug to enable extra/expensive debug code.

This is mostly to avoid the allocation required by the externalization of the
transaction dictionary, which in some cases is huge.

This should reduce the massive memory usage required to inspect the externalized
dictionary.

configure

@@ -41,6 +41,7 @@ for instance \`--prefix=\$HOME'.
 --verbose 		Disable silent build to see compilation details
 --enable-api-docs 	Install XBPS API Library documentation (default disabled)
 --enable-debug		Build with debugging code and symbols (default disabled)
+--enable-fulldebug	Enables extra debugging code (default disabled)
 --enable-static 	Build XBPS static utils (default disabled)
 --enable-tests		Build and install Kyua tests (default disabled)
 			Needs atf >= 0.15 (http://code.google.com/p/kyua)
@@ -53,6 +54,7 @@ for x; do
 	var=${x#*=}
 	case "$opt" in
 	--enable-debug) DEBUG=yes;;
+	--enable-fulldebug) FULL_DEBUG=yes;;
 	--prefix) PREFIX=$var;;
 	--exec-prefix) EPREFIX=$var;;
 	--bindir) BINDIR=$var;;
@@ -204,6 +206,10 @@ if [ -n "$DEBUG" -a "$DEBUG" != no -a "$DEBUG" != false ]; then
 else
 	echo "CPPFLAGS+= -DNDEBUG" >>$CONFIG_MK
 fi
+if [ -n "$FULL_DEBUG" ]; then
+	echo "Enabling extra debugging code."
+	echo "CPPFLAGS+= -DFULL_DEBUG" >>$CONFIG_MK
+fi
 
 case "$OS" in
 linux)