swr: bump minimum supported LLVM version to 4.0

Since radv and radeonsi removed support for LLVM 3.9 the distcheck
target got broken because SWR distribution needed 3.9.x.

After checking with George Kyriazis, SWR is OK with moving to LLVM 4.0
and above, which will solve this problem.

Fixes: 3bf1e036e8 ("amd: remove support for LLVM 3.9")
Cc: George Kyriazis <george.kyriazis@intel.com>
Cc: Tim Rowley <timothy.o.rowley@intel.com>
Cc: Emil Velikov <emil.velikov@collabora.com>
Cc: Dylan Baker <dylan@pnwbakers.com>
Cc: Eric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: Andres Gomez <agomez@igalia.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Reviewed-by: George Kyriazis <george.kyriazis@intel.com>

.travis.yml

         - BUILD=make
         - MAKEFLAGS="-j4"
         - MAKE_CHECK_COMMAND="true"
-        - LLVM_VERSION=3.9
+        - LLVM_VERSION=4.0
         - LLVM_CONFIG="llvm-config-${LLVM_VERSION}"
         - OVERRIDE_CC="gcc-4.8"
         - OVERRIDE_CXX="g++-4.8"
-        # New binutils linker is required for llvm-3.9
-        - OVERRIDE_PATH=/usr/lib/binutils-2.26/bin
         - DRI_LOADERS="--disable-glx --disable-gbm --disable-egl"
         - DRI_DRIVERS=""
         - GALLIUM_ST="--enable-dri --disable-opencl --disable-xa --disable-nine --disable-xvmc --disable-vdpau --disable-va --disable-omx-bellagio --disable-gallium-osmesa"
       addons:
         apt:
           sources:
-            - llvm-toolchain-trusty-3.9
+            - llvm-toolchain-trusty-4.0
           packages:
-            - binutils-2.26
             # LLVM packaging is broken and misses these dependencies
             - libedit-dev
             # From sources above
-            - llvm-3.9-dev
+            - llvm-4.0-dev
             # Common
             - xz-utils
             - x11proto-xf86vidmode-dev
         - BUILD=scons
         - SCONSFLAGS="-j4"
         - SCONS_TARGET="swr=1"
-        - LLVM_VERSION=3.9
+        - LLVM_VERSION=4.0
         - LLVM_CONFIG="llvm-config-${LLVM_VERSION}"
         # Keep it symmetrical to the make build. There's no actual SWR, yet.
         - SCONS_CHECK_COMMAND="true"
       addons:
         apt:
           sources:
-            - llvm-toolchain-trusty-3.9
+            - llvm-toolchain-trusty-4.0
           packages:
             - scons
             # LLVM packaging is broken and misses these dependencies
             - libedit-dev
             # From sources above
-            - llvm-3.9-dev
+            - llvm-4.0-dev
             # Common
             - xz-utils
             - x11proto-xf86vidmode-dev

configure.ac

 LLVM_REQUIRED_R600=3.9.0
 LLVM_REQUIRED_RADEONSI=4.0.0
 LLVM_REQUIRED_RADV=4.0.0
-LLVM_REQUIRED_SWR=3.9.0
+LLVM_REQUIRED_SWR=4.0.0
 
 dnl Check for progs
 AC_PROG_CPP
 fi
 
 # XXX: Keep in sync with LLVM_REQUIRED_SWR
-AM_CONDITIONAL(SWR_INVALID_LLVM_VERSION, test "x$LLVM_VERSION" != x3.9.0 -a \
-                                              "x$LLVM_VERSION" != x3.9.1)
+AM_CONDITIONAL(SWR_INVALID_LLVM_VERSION, test "x$LLVM_VERSION" != x4.0.0 -a \
+                                              "x$LLVM_VERSION" != x4.0.1)
 
 if test "x$enable_llvm" = "xyes" -a "$with_gallium_drivers"; then
     llvm_require_version $LLVM_REQUIRED_GALLIUM "gallium"

meson.build

   # TODO: optional modules
 endif
 
-if with_amd_vk or with_gallium_radeonsi
+if with_amd_vk or with_gallium_radeonsi or with_gallium_swr
   _llvm_version = '>= 4.0.0'
-elif with_gallium_opencl or with_gallium_swr or with_gallium_r600
+elif with_gallium_opencl or with_gallium_r600
   _llvm_version = '>= 3.9.0'
 else
   _llvm_version = '>= 3.3.0'

src/gallium/drivers/swr/Makefile.am

 dist-hook:
 if SWR_INVALID_LLVM_VERSION
 	@echo "*******************************************************"
-	@echo "LLVM 3.9.0 or LLVM 3.9.1 required to create the tarball"
+	@echo "LLVM 4.0.0 or LLVM 4.0.1 required to create the tarball"
 	@echo "*******************************************************"
 	@test
 endif

src/gallium/drivers/swr/SConscript

     env['swr'] = False
     Return()
 
-if env['LLVM_VERSION'] < distutils.version.LooseVersion('3.9'):
-    print("warning: swr requires LLVM >= 3.9: not building swr")
+if env['LLVM_VERSION'] < distutils.version.LooseVersion('4.0'):
+    print("warning: swr requires LLVM >= 4.0: not building swr")
     env['swr'] = False
     Return()