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GNU libiberty is a software library with a collection of subroutines used by various GNU programs.

It was originally intended to be a sort of standard cross-platform library, thus enabling it to be linked (using the usual Unix library form) by just saying "-liberty". The contents consisted of a variety of useful functions. However, the development of standards for C and POSIX took away some of the impetus for this, and libiberty came to be used primarily as a support library for the GNU toolchain.

Copies of libiberty are distributed with gcc, gdb, and the binutils.

One important piece of libiberty functionality is a demangler for C++ and D, included so that it is available to both binutils and GDB.

The name is a pun or word play on the word "liberty". On Unix-like operating systems, library files are always named "lib" + "the name of the library." But when they are linked to with a C compiler command (cc, gcc, etc.), the command line flag specifying the library is -l followed by the part of the library name after "lib". In libiberty's case it therefore becomes -liberty.

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