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Sebastian Huber b0cb9f85ca Use global stdio streams for all configurations
The _REENT_GLOBAL_STDIO_STREAMS was introduced by commit
668a4c8722 in 2017.  Since then it was enabled by
default for RTEMS.  Recently, the option was enabled for Cygwin which
previously used an alternative implementation to use global stdio streams.

In Newlib, the stdio streams are defined to thread-specific pointers
_reent::_stdin, _reent::_stdout and _reent::_stderr.  If the option is disabled
(the default for most systems), then these pointers are initialized to
thread-specific FILE objects which use file descriptors 0, 1, and 2,
respectively.  There are at least three problems with this:

(1) The thread-specific FILE objects are closed by _reclaim_reent().  This
    leads to problems with language run-time libraries that provide wrappers to
    the C/POSIX stdio streams (for example C++ and Ada), since they use the
    thread-specific FILE objects of the initialization thread.  In case the
    initialization thread is deleted, then they use freed memory.

(2) Since thread-specific FILE objects are used with a common output device via
    file descriptors 0, 1 and 2, the locking at FILE object level cannot ensure
    atomicity of the output, e.g. a call to printf().

(3) There are resource managment issues, see:

    https://sourceware.org/pipermail/newlib/2022/019558.html

    https://bugs.linaro.org/show_bug.cgi?id=5841

This patch enables the _REENT_GLOBAL_STDIO_STREAMS behaviour for all Newlib
configurations and removes the option.  This removes a couple of #ifdef blocks.
2022-06-10 20:13:52 +02:00
.github/workflows Cygwin: CI: Drop i686 builds 2022-05-16 13:36:51 +01:00
config Merge autoconf / automake update changes from GCC. 2022-01-17 04:30:37 -05:00
etc etc: switch to automake 2021-11-10 20:14:00 -05:00
include Sync with upstream gcc. 2016-06-23 15:54:55 -04:00
libgloss Use global atexit data for all configurations 2022-05-18 07:45:09 +02:00
newlib Use global stdio streams for all configurations 2022-06-10 20:13:52 +02:00
texinfo
winsup Use global stdio streams for all configurations 2022-06-10 20:13:52 +02:00
.appveyor.yml Cygwin: CI: Drop i686 builds 2022-05-16 13:36:51 +01:00
.gitattributes Add .gitattributes 2015-03-09 20:53:11 +01:00
.gitignore Bump to autoconf 2.69 and automake 1.15.1 2022-01-12 07:05:02 -05:00
COPYING
COPYING.LIB Sync toplevel with upstream GCC. 2016-03-22 10:25:20 +01:00
COPYING.LIBGLOSS Update the address of the FSF in the copyright notice of files which were using the old address. 2021-11-10 20:14:00 -05:00
COPYING.NEWLIB newlib: drop phoenix support 2022-03-28 23:17:06 -04:00
COPYING3
COPYING3.LIB
ChangeLog Update the address of the FSF in the copyright notice of files which were using the old address. 2021-11-10 20:14:00 -05:00
MAINTAINERS MAINTAINERS: clarify policy with config/ (and other top level files) 2012-05-12 03:10:17 +00:00
Makefile.def Sync with upstream gcc. 2016-06-23 15:54:55 -04:00
Makefile.in GCC: Pass --plugin to AR and RANLIB 2022-01-12 08:43:05 -05:00
Makefile.tpl GCC: Pass --plugin to AR and RANLIB 2022-01-12 08:43:05 -05:00
README
README-maintainer-mode Bump to autoconf 2.69 and automake 1.15.1 2022-01-12 07:05:02 -05:00
ar-lib Bump to autoconf 2.69 and automake 1.15.1 2022-01-12 07:05:02 -05:00
compile Sync toplevel with upstream GCC. 2016-03-22 10:25:20 +01:00
config-ml.in Sync toplevel with upstream GCC. 2016-03-22 10:25:20 +01:00
config.guess Bump config.guess and config.sub 2021-02-24 11:03:28 +01:00
config.rpath Remove freebsd1 from libtool.m4 macros and config.rpath. 2011-02-13 21:00:08 +00:00
config.sub Bump config.guess and config.sub 2021-02-24 11:03:28 +01:00
configure Add support for the haiku operating system. These are the os support patches we have been grooming and maintaining for quite a few years over on git.haiku-os.org. All of these architectures are working and most have been stable for quite some time. 2022-01-12 08:43:25 -05:00
configure.ac Add support for the haiku operating system. These are the os support patches we have been grooming and maintaining for quite a few years over on git.haiku-os.org. All of these architectures are working and most have been stable for quite some time. 2022-01-12 08:43:25 -05:00
depcomp Sync toplevel with upstream GCC. 2016-03-22 10:25:20 +01:00
djunpack.bat
install-sh Sync toplevel with upstream GCC. 2016-03-22 10:25:20 +01:00
libtool.m4 libtool.m4: fix nm BSD flag detection 2022-01-12 08:49:10 -05:00
ltgcc.m4
ltmain.sh PR target/59788 2014-02-05 13:17:47 +00:00
ltoptions.m4
ltsugar.m4
ltversion.m4
lt~obsolete.m4
makefile.vms
missing Sync toplevel with upstream GCC. 2016-03-22 10:25:20 +01:00
mkdep Use remove-advertising-clause script to edit BSD licenses 2020-01-29 19:03:31 +01:00
mkinstalldirs Sync toplevel with upstream GCC. 2016-03-22 10:25:20 +01:00
move-if-change Sync toplevel with upstream GCC. 2016-03-22 10:25:20 +01:00
multilib.am Merge autoconf / automake update changes from GCC. 2022-01-17 04:30:37 -05:00
setup.com
src-release * src-release (do-proto-toplevel): Support subdir-path-prefixed 2013-10-15 20:45:52 +00:00
symlink-tree
test-driver Bump to autoconf 2.69 and automake 1.15.1 2022-01-12 07:05:02 -05:00
ylwrap Sync toplevel with upstream GCC. 2016-03-22 10:25:20 +01:00

README

		   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.