unifdefall(1) on Linux
The text f03b9a7670d9, as Debian 13 (Trixie) shipped it. The page shows this text now.
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