From ccbfef23763ee8781b032fec579324deaba1764f Mon Sep 17 00:00:00 2001
From: "Yann E. MORIN\"" <yann.morin.1998@anciens.enib.fr>
Date: Sun, 12 Dec 2010 22:18:52 +0100
Subject: libc: hide no-thread for those C libraries that do not support it

Building non-threaded glibc has been unsupported for a long time, now:
  http://sourceware.org/ml/libc-alpha/2005-08/msg00091.html

As eglibc is a spin-off of glibc: ditto.

So do not offer that possibility in the menuconfig.
Thanks to Thomas Petazzoni for spotting, and helping to solve, the issue!

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

diff --git a/config/libc.in b/config/libc.in
index f8d9ae9..05ebd6a 100644
--- a/config/libc.in
+++ b/config/libc.in
@@ -40,6 +40,10 @@ config LIBC_SUPPORT_WIN32THREADS
     default n
     select LIBC_SUPPORT_THREADS_ANY
 
+config LIBC_SUPPORT_THREADS_NONE
+    bool
+    default n
+
 config THREADS
     string
     default "nptl"          if THREADS_NPTL
@@ -78,6 +82,7 @@ config THREADS_WIN32THREADS
 config THREADS_NONE
     bool
     prompt "none"
+    depends on LIBC_SUPPORT_THREADS_NONE
 
 endchoice
 
diff --git a/config/libc/newlib.in b/config/libc/newlib.in
index b3e90e6..3eba924 100644
--- a/config/libc/newlib.in
+++ b/config/libc/newlib.in
@@ -2,6 +2,7 @@
 # depends on BARE_METAL
 
 config LIBC_newlib
+    select LIBC_SUPPORT_THREADS_NONE
     help
       Newlib is a C library intended for use on embedded systems. It is a
       conglomeration of several library parts, all under free software
diff --git a/config/libc/uClibc.in b/config/libc/uClibc.in
index 24ab3d9..f5a753b 100644
--- a/config/libc/uClibc.in
+++ b/config/libc/uClibc.in
@@ -3,6 +3,7 @@
 
 config LIBC_uClibc
     select LIBC_SUPPORT_LINUXTHREADS
+    select LIBC_SUPPORT_THREADS_NONE
     help
       The de-facto standard for embeded linux systems.
       Highly configurable, thus as feature-rich as you need, without
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