unifdef(1) on Linux
The text de1489a026e9, as Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
remove preprocessor conditionals from code
Flags it lists
-
-D -
-I -
-U -
-c -
-e -
-iD -
-iU -
-k -
-l -
-s -
-t