unifdef - selectively remove C preprocessor conditionals

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: my 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 where I live, uses unifdef with LaTeX.

• Download:
  unifdef-2.12.tar.xz
  unifdef-2.12.tar.gz
  unifdef-2.12.zip
• Read the manual
• Browse the source
• Clone my repository using
  git clone git://dotat.at/unifdef.git
• Collaborate using github
• Copyright licence: BSD
• Build instructions for Unix and Windows

Please send bug reports and patches to me. Unless you state otherwise, I will assume that any contributions are under the two-clause BSD licence.