libpthread: disable unimplemented configurations

When NPTL is available for an architecture just allow the use of it.
If NPTL is not available for an architecture, allow to choose between
LT and LT.old. This minimizes misconfiguration of threading library.

extra/Configs/Config.in

@@ -512,6 +512,16 @@ config LINUXTHREADS_OLD
 	bool "older (stable) version of linuxthreads"
 	# linuxthreads and linuxthreads.old need nanosleep()
 	select UCLIBC_HAS_REALTIME
+	depends on !TARGET_arc && \
+		   !TARGET_arm && \
+		   !TARGET_i386 && \
+		   !TARGET_metag && \
+		   !TARGET_mips && \
+		   !TARGET_powerpc && \
+		   !TARGET_sh && \
+		   !TARGET_sparc && \
+		   !TARGET_x86_64 && \
+		   !TARGET_xtensa
 	help
 	  There are two versions of linuxthreads.  The older (stable) version
 	  has been in uClibc for quite a long time but hasn't seen too many
@@ -521,6 +531,16 @@ config LINUXTHREADS_OLD
 config LINUXTHREADS_NEW
 	bool "slightly newer version of linuxthreads"
 	depends on ARCH_HAS_DEPRECATED_SYSCALLS
+	depends on !TARGET_arc && \
+		   !TARGET_arm && \
+		   !TARGET_i386 && \
+		   !TARGET_metag && \
+		   !TARGET_mips && \
+		   !TARGET_powerpc && \
+		   !TARGET_sh && \
+		   !TARGET_sparc && \
+		   !TARGET_x86_64 && \
+		   !TARGET_xtensa
 	help
 	  The new version has not been tested much, and lacks ports for arches
 	  which glibc does not support (like bfin/frv/etc...), but is based on
@@ -533,24 +553,21 @@ config UCLIBC_HAS_THREADS_NATIVE
 	select UCLIBC_HAS_STDIO_FUTEXES
 	select UCLIBC_HAS_REALTIME
 	# i386 has no lowlevellock support (yet) as opposed to i486 onward
-	depends on !CONFIG_386
+	depends on !CONFIG_386 && \
+		   !TARGET_alpha && \
+		   !TARGET_avr32 && \
+		   !TARGET_bfin && \
+		   !TARGET_c6x && \
+		   !TARGET_cris && \
+		   !TARGET_hppa && \
+		   !TARGET_ia64 && \
+		   !TARGET_m68k && \
+		   !TARGET_microblaze && \
+		   !TARGET_nios2 && \
+		   !TARGET_vax
 	help
 	  If you want to compile uClibc with NPTL support, then answer Y.
 
-	  IMPORTANT NOTE!  NPTL requires a Linux 2.6 kernel, binutils
-	  at least version 2.16 and GCC with at least version 4.1.0. NPTL
-	  will not work with older versions of any above sources. If you
-	  ignore any of these guidelines, you do so at your own risk. Do
-	  not ask for help on any of the development mailing lists.
-
-	  !!!! WARNING !!!! BIG FAT WARNING !!!! REALLY BIG FAT WARNING !!!!
-
-	  This is experimental code and at times it may not even build and
-	  even if it does it might decide to do random damage. This code is
-	  potentially hazardous to your health and sanity. It will remain
-	  that way until further notice at which point this notice will
-	  disappear. Thank you for your support and for not smoking.
-
 endchoice
 
 config UCLIBC_HAS_THREADS