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A useful tool for removing #ifdef'ed lines from a file http://dotat.at/prog/unifdef/
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README.md

unifdef

Unifdef is useful for removing #ifdef'ed lines from a file while otherwise leaving the file alone. You specify which symbols are defined or undefined with -D and -U flags, and unifdef removes the corresponding ifdefs, and the enclosed code if appropriate. It's especially useful for removing those "#ifdef BROKEN" and "#ifdef PRIVATE" clauses from code before you release it. Unifdef acts on #ifdef, #ifndef, #else, and #en­ dif lines, and it knows only enough about C and C++ to know when one of these is inactive because it is inside a comment, or a single or double quote.