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Newlib's posix_spawn has been taken from FreeBSD. The code relies on BSD-specific behaviour of vfork, namely the fact that vfork blocks the parent until the child exits or calls execve as well as the fact that the child shares parent memory in non-COW mode. This behaviour can't be emulated by Cygwin. Cygwin's vfork is equivalent to fork. This is POSIX-compliant, but it's lacking BSD's vfork ingrained synchronization of the parent to wait for the child calling execve, or the chance to just write a variable and the parent will see the result. So this requires a Cygwin-specific solution. The core function of posix_spawn, called do_posix_spawn is now implemented twice, once using the BSD method, and once for Cygwin using Windows synchronization under the hood waiting for the child to call execve and signalling errors upstream. The Windows specifics are hidden inside Cygwin, so newlib only calls internal Cygwin functions. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.