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 #if, #ifdef, #ifndef, #elif, #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.\"
Current version: 2.6
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