unifdef(1) on Linux
The text 98232e8f022f, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
remove preprocessor conditionals from code
Flags it lists
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-B -
-D -
-I -
-K -
-M -
-S -
-U -
-V -
-b -
-c -
-d -
-e -
-f -
-h -
-iD -
-iU -
-k -
-m -
-n -
-o -
-s -
-t -
-x