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README update


I propose this patch to update README, cutting down on the information 
about Linuxthreads and pre-2.6 Linux kernels (which have been unlikely to 
work for a long time) and udpating the lists of configurations to reflect 
those currently in libc and ports (other than am33 in ports, which hasn't 
been maintained for a very long time although there is now a volunteer to 
update it).

Remark: Alpha is noted here as needing 2.6.9 kernel for NPTL, its 
configure.in should probably be requiring 2.6.9 instead of 2.6.0.

2012-04-27  Joseph Myers  <joseph@codesourcery.com>

	* README: Cut down references to pre-2.6 Linux kernels and
	Linuxthreads.  Update lists of configurations in libc and ports
	and sort alphabetically.

diff --git a/README b/README
index a4e3933..7c465ae 100644
--- a/README
+++ b/README
@@ -17,11 +17,11 @@ GNU/Hurd system, using configurations i[34567]86-*-gnu.
 When working with Linux kernels, the GNU C Library version from
 version 2.4 on is intended primarily for use with Linux kernel version
 2.6.0 and later.  We only support using the NPTL implementation of
-pthreads, which is now the default configuration.  Most of the C
-library will continue to work on older Linux kernels and many programs
-will not require a 2.6 kernel to run correctly.  However, pthreads and
-related functionality will not work at all on old kernels and we do
-not recommend using glibc 2.4 with any Linux kernel prior to 2.6.
+pthreads, which is now the default configuration.  The library is
+unlikely to build without NPTL, or to work on Linux kernels prior to
+2.6.  The old LinuxThreads add-on implementation of pthreads for older
+Linux kernels is no longer supported, and we are not distributing it
+with this release.
 
 All Linux kernel versions prior to 2.6.16 are known to have some bugs that
 may cause some of the tests related to pthreads in "make check" to fail.
@@ -31,28 +31,18 @@ Linux kernel version that you can use, before pursuing those bugs further.
 Also note that the shared version of the libgcc_s library must be
 installed for the pthread library to work correctly.
 
-The old LinuxThreads add-on implementation of pthreads for older Linux
-kernels is no longer supported, and we are not distributing it with this
-release.  Someone has volunteered to revive its maintenance unofficially
-for at least a short time for the benefit of those using Linux kernels
-older than 2.6, but a working version is not presently available.  When
-it is in working condition, we will make it available alongside future
-glibc releases.  LinuxThreads will not be supported.
-
 The GNU C Library supports these configurations for using Linux kernels:
 
-	i[34567]86-*-linux-gnu
+	i[4567]86-*-linux-gnu
 	x86_64-*-linux-gnu
-	powerpc-*-linux-gnu
+	powerpc-*-linux-gnu	Hardware floating point required
 	powerpc64-*-linux-gnu
 	s390-*-linux-gnu
 	s390x-*-linux-gnu
-	ia64-*-linux-gnu
+	sh[34]-*-linux-gnu	Requires Linux 2.6.11
 	sparc*-*-linux-gnu
 	sparc64*-*-linux-gnu
 
-	sh[34]-*-linux-gnu	Requires Linux 2.6.11
-
 The code for other CPU configurations supported by volunteers outside of
 the core glibc maintenance effort is contained in the separate `ports'
 add-on.  You can find glibc-ports-VERSION distributed separately in the
@@ -60,10 +50,15 @@ same place where you got the main glibc distribution files.
 Currently these configurations are known to work using the `ports' add-on:
 
 	alpha*-*-linux-gnu	Requires Linux 2.6.9 for NPTL
-	arm-*-linux-gnu		Requires Linux 2.6.15 for NPTL, no SMP support
-	arm-*-linux-gnueabi	Requires Linux 2.6.16-rc1 for NPTL, no SMP
+	arm-*-linux-gnueabi	Requires Linux 2.6.16-rc1 for NPTL
+	hppa-*-linux-gnu	Requires Linux 2.6.9 for NPTL
+	ia64-*-linux-gnu
+	m68k-*-linux-gnu
 	mips-*-linux-gnu	Requires Linux 2.6.12 for NPTL
 	mips64-*-linux-gnu	Requires Linux 2.6.12 for NPTL
+	powerpc-*-linux-gnu	Software floating point
+	tilegx-*-linux-gnu
+	tilepro-*-linux-gnu
 
 The ports distribution also contains code for other configurations that
 do not work or have not been maintained recently, but will be of use to

-- 
Joseph S. Myers
joseph@codesourcery.com


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