[PATCH V2] mesa: Fix bild with waylang and egl

[Khem Raj <raj.khem@gmail.com>]

When we have wayland enabled with egl then it enables the wayland
plugin which actually fails to build because its not finding wayland-protocol
xml templates in proper location which is recipe sysroot since
we are cross compiling

Fixes build errors e.g.
make[4]: *** No rule to make target `//usr/share/wayland-protocols/unstable/linux-dmabuf/linux-dmabuf-unstable-v1.xml', needed by `drivers/dri2/linux-dmabuf-unstable-v1-client-protocol.h'.  Stop.
make[4]: *** Waiting for unfinished jobs....

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
V2: Rebase on master

 ...ss-compile-WAYLAND_PROTOCOLS_DATADIR.patch | 24 +++++++++++++++++++
 meta/recipes-graphics/mesa/mesa.inc           |  2 ++
 meta/recipes-graphics/mesa/mesa_18.1.3.bb     |  1 +
 3 files changed, 27 insertions(+)
 create mode 100644 meta/recipes-graphics/mesa/files/cross-compile-WAYLAND_PROTOCOLS_DATADIR.patch

diff --git a/meta/recipes-graphics/mesa/files/cross-compile-WAYLAND_PROTOCOLS_DATADIR.patch b/meta/recipes-graphics/mesa/files/cross-compile-WAYLAND_PROTOCOLS_DATADIR.patch
new file mode 100644
index 0000000000..b4e3c4995f
--- /dev/null
+++ b/meta/recipes-graphics/mesa/files/cross-compile-WAYLAND_PROTOCOLS_DATADIR.patch
@@ -0,0 +1,24 @@
+use PKG_CHECK_VAR for defining WAYLAND_PROTOCOLS_DATADIR
+
+This allows to override the wayland-protocols pkgdatadir with the
+WAYLAND_PROTOCOLS_DATADIR from environment.
+
+pkgconfig would return an absolute path in /usr/share/wayland-protocols
+for the pkgdatadir value, which is not suitable for cross-compiling.
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Pending
+
+Index: mesa-18.1.2/configure.ac
+===================================================================
+--- mesa-18.1.2.orig/configure.ac
++++ mesa-18.1.2/configure.ac
+@@ -1808,7 +1808,7 @@ for plat in $platforms; do
+         PKG_CHECK_MODULES([WAYLAND_CLIENT], [wayland-client >= $WAYLAND_REQUIRED])
+         PKG_CHECK_MODULES([WAYLAND_SERVER], [wayland-server >= $WAYLAND_REQUIRED])
+         PKG_CHECK_MODULES([WAYLAND_PROTOCOLS], [wayland-protocols >= $WAYLAND_PROTOCOLS_REQUIRED])
+-        WAYLAND_PROTOCOLS_DATADIR=`$PKG_CONFIG --variable=pkgdatadir wayland-protocols`
++        PKG_CHECK_VAR([WAYLAND_PROTOCOLS_DATADIR], [wayland-protocols >= $WAYLAND_PROTOCOLS_REQUIRED], pkgdatadir)
+ 
+         AC_PATH_PROG([WAYLAND_SCANNER], [wayland-scanner], [:])
+ 
diff --git a/meta/recipes-graphics/mesa/mesa.inc b/meta/recipes-graphics/mesa/mesa.inc
index d1723e3506..fed2900577 100644
--- a/meta/recipes-graphics/mesa/mesa.inc
+++ b/meta/recipes-graphics/mesa/mesa.inc
@@ -109,6 +109,8 @@ FULL_OPTIMIZATION_append = " -fno-omit-frame-pointer"
 
 CFLAGS_append_armv5 = " -DMISSING_64BIT_ATOMICS"
 
+EXTRA_OEMAKE += "WAYLAND_PROTOCOLS_DATADIR=${STAGING_DATADIR}/wayland-protocols"
+
 # Remove the mesa dependency on mesa-dev, as mesa is empty
 RDEPENDS_${PN}-dev = ""
 
diff --git a/meta/recipes-graphics/mesa/mesa_18.1.3.bb b/meta/recipes-graphics/mesa/mesa_18.1.3.bb
index c47c57e9d8..6af1216b79 100644
--- a/meta/recipes-graphics/mesa/mesa_18.1.3.bb
+++ b/meta/recipes-graphics/mesa/mesa_18.1.3.bb
@@ -9,6 +9,7 @@ SRC_URI = "https://mesa.freedesktop.org/archive/mesa-${PV}.tar.xz \
            file://0006-Use-Python-3-to-execute-the-scripts.patch \
            file://0007-dri-i965-Add-missing-time.h-include.patch \
            file://0008-egl-fix-build-race-in-automake.patch \
+           file://cross-compile-WAYLAND_PROTOCOLS_DATADIR.patch \
 "
 
 SRC_URI[md5sum] = "b34273403a605f6f98ead00f0bdf8e0b"
-- 
2.18.0