gcc: fix cross-compiling stage by explicitely specify the target architecture (needed by gcc 4.3 and upwards)

base/gcc/gcc.conf

@@ -124,6 +124,12 @@ if atstage toolchain; then
 	export LDFLAGS="-Wl,-rpath,${root}${libdir}"
 fi
 
+if atstage cross; then
+	# for gcc versions 4.3 and upwards we have to explicitely specifiy the
+	# target architecture at cross-compiling stage
+	var_append confopt ' ' '--target=$arch_target'
+fi
+
 if ! atstage native; then
 	var_append confopt " " "--disable-libmudflap"
 else