gcc: fix to help configure to use the native libraries of gmp, mpfr, ppl and cloog-ppl we build in the toolchain directory

base/gcc/gcc.conf

@@ -115,6 +115,13 @@ if atstage toolchain; then
 	var_append confopt " " "--disable-shared"
 	var_append confopt " " "--disable-libssp"
 	var_append confopt " " "--disable-libgomp"
+
+	# use the native libraries we build in the toolchain directory
+	var_append extraconfopt ' ' '--with-gmp=$root'
+	var_append extraconfopt ' ' '--with-mpfr=$root --with-mpfr-lib=$root/$libdir'
+	var_append extraconfopt ' ' '--with-ppl=$root'
+	var_append extraconfopt ' ' '--with-cloog=$root'
+	export LDFLAGS="-Wl,-rpath,${root}${libdir}"
 fi
 
 if ! atstage native; then