mariadb: Do not use ucontext_* APIs with musl

musl has ucontext.h header but does not implement the APIs

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/mysql/mariadb.inc

@@ -16,6 +16,7 @@ SRC_URI = "http://downloads.mariadb.com/MariaDB/mariadb-${PV}/source/mariadb-${P
            file://configure.cmake-fix-valgrind.patch \
            file://fix-a-building-failure.patch \
            file://change-cc-to-cc-version.patch \
+           file://0001-disable-ucontext-on-musl.patch \
           "
 SRC_URI[md5sum] = "fca86f1eaed2163b4bdce4f98f472324"
 SRC_URI[sha256sum] = "e142f9459507b97c5848042863b313ce70750118446bb4e35e5c07fe66007293"

meta-oe/recipes-support/mysql/mariadb/0001-disable-ucontext-on-musl.patch

@@ -0,0 +1,28 @@
+From 5bc3e7ef9700d12054e0125a126f1bb093f01ef9 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Sun, 26 Mar 2017 14:30:33 -0700
+Subject: [PATCH] disable ucontext on musl
+
+musl does not have *contex() APIs even though it has ucontext.h header
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ include/my_context.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/include/my_context.h b/include/my_context.h
+index dd44103..9b28c17 100644
+--- a/include/my_context.h
++++ b/include/my_context.h
+@@ -31,7 +31,7 @@
+ #define MY_CONTEXT_USE_X86_64_GCC_ASM
+ #elif defined(__GNUC__) && __GNUC__ >= 3 && defined(__i386__)
+ #define MY_CONTEXT_USE_I386_GCC_ASM
+-#elif defined(HAVE_UCONTEXT_H)
++#elif defined(__GLIBC__) && defined(HAVE_UCONTEXT_H)
+ #define MY_CONTEXT_USE_UCONTEXT
+ #else
+ #define MY_CONTEXT_DISABLE
+-- 
+2.12.1
+