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diff --git a/development/unifdef/README b/development/unifdef/README new file mode 100644 index 0000000000..c233377f98 --- /dev/null +++ b/development/unifdef/README @@ -0,0 +1,13 @@ +unifdef (selectively processes C conditional compilation) + +The unifdef utility selectively processes conditional C preprocessor #if +and #ifdef directives. It removes from a file both the directives and the +additional text that they delimit, while otherwise leaving the file alone. + +It is useful for avoiding distractions when studying code that uses +#ifdef heavily for portability: the author's original motivation was to +understand xterm's pty handling code. It can be used as a lightweight +preprocessor; for example the Linux kernel uses unifdef to strip out +#ifdef __KERNEL__ sections from the headers it exports to userland. You +can use unifdef with languages other than C; for example UIT, a publisher +in Cambridge, uses unifdef with LaTeX. |