added patch to solve opencl sypport buildfailure

.SRCINFO

@@ -1,6 +1,6 @@
 pkgbase = mesa-git
 	pkgdesc = an open-source implementation of the OpenGL specification, git version
-	pkgver = 18.2.0_devel.101888.3db93f9128
+	pkgver = 18.2.0_devel.102206.c879011c72
 	pkgrel = 1
 	url = http://mesa3d.sourceforge.net
 	arch = x86_64
@@ -19,6 +19,7 @@ pkgbase = mesa-git
 	makedepends = ocl-icd
 	makedepends = vulkan-icd-loader
 	makedepends = libgcrypt
+	makedepends = libclc
 	depends = libdrm
 	depends = libxxf86vm
 	depends = libxdamage
@@ -28,6 +29,7 @@ pkgbase = mesa-git
 	depends = llvm-libs-svn
 	depends = libunwind
 	depends = libglvnd
+	depends = libclc
 	optdepends = opengl-man-pages: for the OpenGL API man pages
 	provides = mesa
 	provides = vulkan-intel
@@ -35,6 +37,7 @@ pkgbase = mesa-git
 	provides = libva-mesa-driver
 	provides = mesa-vdpau
 	provides = vulkan-driver
+	provides = opencl-mesa
 	provides = opencl-driver
 	provides = opengl-driver
 	conflicts = mesa
@@ -46,8 +49,10 @@ pkgbase = mesa-git
 	conflicts = wayland<1.14.93
 	source = mesa::git://anongit.freedesktop.org/mesa/mesa
 	source = LICENSE
+	source = opencl-autotools-Fix-linking-order-for-OpenCL-target.patch
 	sha512sums = SKIP
 	sha512sums = 25da77914dded10c1f432ebcbf29941124138824ceecaf1367b3deedafaecabc082d463abcfa3d15abff59f177491472b505bcb5ba0c4a51bb6b93b4721a23c2
+	sha512sums = f23e31e902e05f9102fdc3f3c7cc96306e04e297785bdc46f955f668588256c8ebfeb530a47bea9e9fea16f5c4e4e75cc0dceb71b042bed6a17a0ce320e234f1
 
 pkgname = mesa-git
 

PKGBUILD

@@ -12,28 +12,31 @@
 pkgbase=mesa-git
 pkgname=('mesa-git')
 pkgdesc="an open-source implementation of the OpenGL specification, git version"
-pkgver=18.2.0_devel.101888.3db93f9128
+pkgver=18.2.0_devel.102206.c879011c72
 pkgrel=1
 arch=('x86_64')
 makedepends=('git' 'python2-mako' 'llvm-svn' 'clang-svn' 'xorgproto'
               'libxml2' 'libx11'  'libvdpau' 'libva' 'elfutils' 'libomxil-bellagio'
-              'ocl-icd' 'vulkan-icd-loader' 'libgcrypt')
+              'ocl-icd' 'vulkan-icd-loader' 'libgcrypt' 'libclc')
 depends=('libdrm' 'libxxf86vm' 'libxdamage' 'libxshmfence' 'libelf'
-         'libomxil-bellagio' 'llvm-libs-svn' 'libunwind' 'libglvnd')
+         'libomxil-bellagio' 'llvm-libs-svn' 'libunwind' 'libglvnd' 'libclc')
 optdepends=('opengl-man-pages: for the OpenGL API man pages')
-provides=('mesa' 'vulkan-intel' 'vulkan-radeon' 'libva-mesa-driver' 'mesa-vdpau' 'vulkan-driver' 'opencl-driver' 'opengl-driver')
+provides=('mesa' 'vulkan-intel' 'vulkan-radeon' 'libva-mesa-driver' 'mesa-vdpau' 'vulkan-driver' 'opencl-mesa' 'opencl-driver' 'opengl-driver')
 conflicts=('mesa' 'opencl-mesa' 'vulkan-intel' 'vulkan-radeon' 'libva-mesa-driver' 'mesa-vdpau' 'wayland<1.14.93')
 url="http://mesa3d.sourceforge.net"
 license=('custom')
 source=('mesa::git://anongit.freedesktop.org/mesa/mesa'
         'LICENSE'
+        'opencl-autotools-Fix-linking-order-for-OpenCL-target.patch'
 )
 sha512sums=('SKIP'
             '25da77914dded10c1f432ebcbf29941124138824ceecaf1367b3deedafaecabc082d463abcfa3d15abff59f177491472b505bcb5ba0c4a51bb6b93b4721a23c2'
-)
+            'f23e31e902e05f9102fdc3f3c7cc96306e04e297785bdc46f955f668588256c8ebfeb530a47bea9e9fea16f5c4e4e75cc0dceb71b042bed6a17a0ce320e234f1')
 
 prepare() {
   cd mesa
+  # fixes opencl build failure, see https://bugs.freedesktop.org/show_bug.cgi?id=106209 and https://patchwork.freedesktop.org/patch/219763/
+  patch -Np1 -i ../opencl-autotools-Fix-linking-order-for-OpenCL-target.patch
   autoreconf -vfi
 }
 
@@ -59,12 +62,12 @@ build () {
     --disable-xvmc \
     --enable-vdpau \
     --enable-omx-bellagio \
+    --enable-opencl \
+    --enable-opencl-icd \
     --enable-glx-tls \
     --enable-libglvnd
 
 # broken, see https://bugs.freedesktop.org/show_bug.cgi?id=106209
-#    --enable-opencl \
-#    --enable-opencl-icd \
 
 
 # Used configure settings

opencl-autotools-Fix-linking-order-for-OpenCL-target.patch

@@ -0,0 +1,17 @@
+diff --git a/src/gallium/targets/opencl/Makefile.am b/src/gallium/targets/opencl/Makefile.am
+index de68a93ad5..f0e1de7797 100644
+--- a/src/gallium/targets/opencl/Makefile.am
++++ b/src/gallium/targets/opencl/Makefile.am
+@@ -23,11 +23,10 @@ lib@OPENCL_LIBNAME@_la_LIBADD = \
+ 	$(LIBELF_LIBS) \
+ 	$(DLOPEN_LIBS) \
+ 	-lclangCodeGen \
+-	-lclangFrontendTool \
+ 	-lclangFrontend \
++	-lclangFrontendTool \
+ 	-lclangDriver \
+ 	-lclangSerialization \
+-	-lclangCodeGen \
+ 	-lclangParse \
+ 	-lclangSema \
+ 	-lclangAnalysis \