some GNU extensions in libc. You probably only need this option
if you plan to run busybox on desktop.
+config USE_PORTABLE_CODE
+ bool "Avoid using GCC-specific code constructs"
+ default n
+ help
+ Use this option if you are trying to compile busybox with
+ compiler other than gcc.
+ If you do use gcc, this option may needlessly increase code size.
+
choice
prompt "Buffer allocation policy"
default FEATURE_BUFFERS_USE_MALLOC