qemu/local.conf.sample: Add sdl PACKAGECONFIG

Currently the SDL configuration option for qemu floats. This is confusing to new users
and makes the build non-determinstic. This patch adds a PACKAGECONFIG option, defaulting
to off and adds documentation to local.conf.sample leaving it on by default since this
is the configuration our quick start assumes.

(From meta-yocto rev: 1ddafa2d5200793f81808d79d1668282d57c2e93)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/meta-yocto/conf/local.conf.sample b/meta-yocto/conf/local.conf.sample
index 885d4db..71856b8 100644
--- a/meta-yocto/conf/local.conf.sample
+++ b/meta-yocto/conf/local.conf.sample
@@ -229,6 +229,17 @@ BB_DISKMON_DIRS = "\
 #file://.* http://someserver.tld/share/sstate/PATH;downloadfilename=PATH \n \
 #file://.* file:///some/local/dir/sstate/PATH"
 
+
+#
+# Qemu configuration
+#
+# By default qemu will build with a builtin VNC server where graphical output can be
+# seen. The two lines below enable the SDL backend too. This assumes there is a
+# libsdl library available on your build system.
+PACKAGECONFIG_pn-qemu-native = "sdl"
+ASSUME_PROVIDED += "libsdl-native"
+
+
 # CONF_VERSION is increased each time build/conf/ changes incompatibly and is used to
 # track the version of this file when it was generated. This can safely be ignored if
 # this doesn't mean anything to you.