IFDEF(1)

NAME
ifdef - remove #ifdefs from a file

SYNOPSIS
ifdef [-t] [-dsymbol] [-Dsymbol] [-Usymbol] [-Isymbol] [file]

OPTIONS

EXAMPLES

DESCRIPTION

Ifdef allows conditional code [ #ifdef ... #endif ] to be selectively removed from C files, but at the same time leaving all other C preprocessor commands intact such as #define, #include etc. Input to ifdef is either the file named as the last argument, or stdin if no file is named. Output goes to stdout.

Symbols may be defined with the -d or -D flags just like cpp, except that the latter option ignores subsequent #undefs. It is not permitted to give values to symbols. Similarly, -U undefines a symbol and ignores subsequent #definess. Symbols defined with -I are ignored; any #ifdef using an ignored symbol will be left intact.