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The Cygnus tree is used for various packages including gdb, the GNU binutils, and egcs. It is also, of course, used for Cygnus releases.
In the Cygnus tree, the top level `configure' script uses the old Cygnus configure system, not autoconf. The top level `Makefile.in' is written to build packages based on what is in the source tree, and supports building a large number of tools in a single `configure'/`make' step.
The Cygnus tree may be configured with a `--target' option. The `--target' option applies recursively to every subdirectory, and permits building an entire set of cross tools at once.
5.6.1 Host and Target Libraries 5.6.2 Target Library Configure Scripts 5.6.3 Make Targets in Cygnus Tree 5.6.4 Target libiberty