libunwind: Add a confgure option for tests

Tests dont compile on musl due to its use
of {get|set}context APIs, adding this option
to disable tests helps it to compile

(From OE-Core rev: 026f14c1353b599546cec24b6b779ff872ff890e)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/libunwind/libunwind/0001-add-knobs-to-disable-enable-tests.patch

@@ -0,0 +1,69 @@
+From 459e471fcc33d300f7bbcdaf3e0dc338d9dc15b9 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Sat, 30 Apr 2016 16:56:34 +0000
+Subject: [PATCH] add knobs to disable/enable tests
+
+Some tests do not compile on musl libc
+in general its good to have such a knob
+since not all builds may want to enable
+tests
+
+Upstream-Status: Pending
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ Makefile.am  |  6 +++++-
+ configure.ac | 12 ++++++++++--
+ 2 files changed, 15 insertions(+), 3 deletions(-)
+
+diff --git a/Makefile.am b/Makefile.am
+index 6a3ed9e..0c29b3e 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -42,7 +42,11 @@ endif
+ 
+ nodist_include_HEADERS = include/libunwind-common.h
+ 
+-SUBDIRS = src tests
++SUBDIRS = src
++
++if CONFIG_TESTS
++SUBDIRS += tests
++endif
+ 
+ if CONFIG_DOCS
+ SUBDIRS += doc
+diff --git a/configure.ac b/configure.ac
+index 85d78f8..d362387 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -129,6 +129,10 @@ AC_ARG_ENABLE(documentation,
+ 	AS_HELP_STRING([--disable-documentation],[Disable generating the man pages]),,
+ 	[enable_documentation=yes])
+ 
++AC_ARG_ENABLE(tests,
++	AS_HELP_STRING([--disable-tests],[Disable building tests]),,
++	[enable_tests=yes])
++
+ AC_MSG_CHECKING([if we should build libunwind-setjmp])
+ AC_MSG_RESULT([$enable_setjmp])
+ 
+@@ -395,9 +399,13 @@ AM_CONDITIONAL([CONFIG_DOCS], [test x$enable_documentation = xyes])
+ if test "x$enable_documentation" = "xyes"; then
+   AC_CONFIG_FILES(doc/Makefile doc/common.tex)
+ fi
++AM_CONDITIONAL([CONFIG_TESTS], [test x$enable_tests = xyes])
++if test "x$enable_tests" = "xyes"; then
++  AC_CONFIG_FILES(tests/Makefile tests/check-namespace.sh)
++fi
++
+ 
+-AC_CONFIG_FILES(Makefile src/Makefile tests/Makefile tests/check-namespace.sh
+-		include/libunwind-common.h
++AC_CONFIG_FILES(Makefile src/Makefile include/libunwind-common.h
+                 include/libunwind.h include/tdep/libunwind_i.h)
+ AC_CONFIG_FILES(src/unwind/libunwind.pc src/coredump/libunwind-coredump.pc
+                 src/ptrace/libunwind-ptrace.pc src/setjmp/libunwind-setjmp.pc
+-- 
+1.8.3.1
+

meta/recipes-support/libunwind/libunwind_git.bb

@@ -9,9 +9,10 @@ SRC_URI = "git://git.sv.gnu.org/libunwind.git \
            file://0001-backtrace-Use-only-with-glibc-and-uclibc.patch \
            file://0001-x86-Stub-out-x86_local_resume.patch \
            file://0001-Fix-build-on-mips-musl.patch \
-"
+           file://0001-add-knobs-to-disable-enable-tests.patch \
+           "
 
-EXTRA_OECONF_append_libc-musl = " --disable-documentation"
+EXTRA_OECONF_append_libc-musl = " --disable-documentation --disable-tests "
 
 # http://errors.yoctoproject.org/Errors/Details/20487/
 ARM_INSTRUCTION_SET_armv4 = "arm"