gitlab-ci: Build clover against all supported versions of LLVM

And consolidate it all into a single job.

It doesn't take much longer than a single version, thanks to ccache.
Overall, this single job might be faster or at least use fewer CPU
cycles than the two jobs before, while covering thrice as many versions
of LLVM.

v2:
* Move "rm -rf _build" to meson-build.sh.
* Set GALLIUM_DRIVERS the same way both times in the meson-clover job,
  for symmetry.

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com> # v1

.gitlab-ci.yml

@@ -14,7 +14,7 @@
 # repository's registry will be used there as well.
 variables:
   UPSTREAM_REPO: mesa/mesa
-  DEBIAN_TAG: "2019-05-01"
+  DEBIAN_TAG: "2019-05-08"
   DEBIAN_VERSION: stretch-slim
   DEBIAN_IMAGE: "$CI_REGISTRY_IMAGE/debian/$DEBIAN_VERSION:$DEBIAN_TAG"
 
@@ -183,7 +183,7 @@ meson-main:
     GALLIUM_DRIVERS: "iris,nouveau,kmsro,r300,r600,freedreno,svga,v3d,vc4,virgl,etnaviv,panfrost,lima"
     LLVM_VERSION: "7"
 
-meson-clover-llvm:
+meson-clover:
   extends: .meson-build
   variables:
     UNWIND: "true"
@@ -200,13 +200,15 @@ meson-clover-llvm:
       -D gallium-xa=false
       -D gallium-nine=false
       -D gallium-opencl=icd
-    GALLIUM_DRIVERS: "r600,radeonsi"
-
-meson-clover-llvm39:
-  extends: meson-clover-llvm
-  variables:
-    GALLIUM_DRIVERS: "i915,r600"
-    LLVM_VERSION: "3.9"
+  script:
+    - export GALLIUM_DRIVERS="r600,radeonsi"
+    - .gitlab-ci/meson-build.sh
+    - LLVM_VERSION=7 .gitlab-ci/meson-build.sh
+    - export GALLIUM_DRIVERS="i915,r600"
+    - LLVM_VERSION=3.9 .gitlab-ci/meson-build.sh
+    - LLVM_VERSION=4.0 .gitlab-ci/meson-build.sh
+    - LLVM_VERSION=5.0 .gitlab-ci/meson-build.sh
+    - LLVM_VERSION=6.0 .gitlab-ci/meson-build.sh
 
 scons-nollvm:
   extends: .scons-build

.gitlab-ci/debian-install.sh

@@ -26,12 +26,18 @@ apt-get install -y -t stretch-backports \
       llvm-3.4-dev \
       llvm-3.9-dev \
       libclang-3.9-dev \
+      llvm-4.0-dev \
+      libclang-4.0-dev \
       llvm-5.0-dev \
+      libclang-5.0-dev \
       llvm-6.0-dev \
+      libclang-6.0-dev \
       llvm-7-dev \
+      libclang-7-dev \
+      llvm-8-dev \
+      libclang-8-dev \
       g++ \
-      clang-8 \
-      libclang-7-dev
+      clang-8
 
 # Install remaining packages from Debian buster to get newer versions
 add-apt-repository "deb https://deb.debian.org/debian/ buster main"

.gitlab-ci/meson-build.sh

@@ -10,9 +10,11 @@ if test -n "$LLVM_VERSION"; then
     echo -e "[binaries]\nllvm-config = '`which $LLVM_CONFIG`'" > native.file
     $LLVM_CONFIG --version
 else
+    rm -f native.file
     touch native.file
 fi
 
+rm -rf _build
 meson _build --native-file=native.file \
       -D buildtype=debug \
       -D build-tests=true \