configure.ac: bump Clover LLVM requirement to 3.9

The only driver that utilises Clover already depends on LLVM 3.9.
Close to every supported distribution has said version.

Additionally libclc also requires LLVM 3.9.

With this in mind, we can safely bump the requirement.

There is a handful of dead code that we could remove, which will be
resolved with later commits.

Note: this drops the LLVM 3.6 build from the Travis build. LLVM 3.9 (and
later) are already covered in there.

https://lists.freedesktop.org/archives/mesa-dev/2017-September/170028.html

v2: Add reference to discussion thread (Eric), adjust libclc LLVM req.
(Jan).

Cc: Aaron Watry <awatry@gmail.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Acked-by: Vedran Miletić <vedran@miletic.net>
Acked-by: Jan Vesely <jan.vesely@rutgers.edu>
Acked-by: Francisco Jerez <currojerez@riseup.net>

.travis.yml

@@ -113,44 +113,6 @@ matrix:
             - libx11-xcb-dev
             - libelf-dev
             - libunwind8-dev
-    - env:
-        # NOTE: Analogous to SWR above, building Clover is quite slow.
-        - LABEL="make Gallium ST Clover"
-        - BUILD=make
-        - MAKEFLAGS="-j4"
-        - MAKE_CHECK_COMMAND="true"
-        - LLVM_VERSION=3.6
-        - LLVM_CONFIG="llvm-config-${LLVM_VERSION}"
-        - OVERRIDE_CC=gcc-4.7
-        - OVERRIDE_CXX=g++-4.7
-        - DRI_LOADERS="--disable-glx --disable-gbm --disable-egl"
-        - DRI_DRIVERS=""
-        - GALLIUM_ST="--disable-dri --enable-opencl --enable-opencl-icd --enable-llvm --disable-xa --disable-nine --disable-xvmc --disable-vdpau --disable-va --disable-omx-bellagio --disable-gallium-osmesa"
-        # i915 most likely doesn't work with OpenCL.
-        # Regardless - we're doing a quick build test here.
-        - GALLIUM_DRIVERS="i915"
-        - VULKAN_DRIVERS=""
-        - LIBUNWIND_FLAGS="--enable-libunwind"
-      addons:
-        apt:
-          sources:
-            - llvm-toolchain-trusty-3.6
-          packages:
-            - libclc-dev
-            # LLVM packaging is broken and misses these dependencies
-            - libedit-dev
-            - g++-4.7
-            # From sources above
-            - llvm-3.6-dev
-            - clang-3.6
-            - libclang-3.6-dev
-            # Common
-            - xz-utils
-            - x11proto-xf86vidmode-dev
-            - libexpat1-dev
-            - libx11-xcb-dev
-            - libelf-dev
-            - libunwind8-dev
     - env:
         # NOTE: Analogous to SWR above, building Clover is quite slow.
         - LABEL="make Gallium ST Clover LLVM-3.9"

configure.ac

@@ -101,7 +101,7 @@ ZLIB_REQUIRED=1.2.3
 
 dnl LLVM versions
 LLVM_REQUIRED_GALLIUM=3.3.0
-LLVM_REQUIRED_OPENCL=3.6.0
+LLVM_REQUIRED_OPENCL=3.9.0
 LLVM_REQUIRED_R600=3.9.0
 LLVM_REQUIRED_RADEONSI=3.9.0
 LLVM_REQUIRED_RADV=3.9.0