gitlab-ci: build with clang and do multiple builds in one test-step

Also, let one docker image do multiple builds. We fetch a fedora docker
image, and then install 250 MB of packages. That alone takes a lot of
time and resources. Instead of running a large number of docker images
that only do one build, let one image do several builds.

Also, install ccache. Hopefully this way we can benefit from
building the same sources multiple times.

Also note that building docs does not work currently with clang,
due to g-ir-scanner. See commit 05568860cce5332977d92b85f7c25b8ed646cd58.

.gitlab-ci.yml

@@ -11,10 +11,25 @@ stages:
 .fedora_install: &fedora_install
   before_script:
     - NM_INSTALL="dnf install -y" ./contrib/fedora/REQUIRED_PACKAGES
-    - dnf install -y glibc-langpack-pl
+    - dnf install -y glibc-langpack-pl ccache clang
     - locale -a
     - contrib/scripts/nm-ci-patch-gtkdoc.sh || true
 
+.fedora_script: &fedora_script
+  stage: test
+  script:
+    - CI=gitlab BUILD_TYPE=autotools CC=gcc   WITH_DOCS=1 contrib/scripts/nm-ci-run.sh
+    - mv build/INST/share/gtk-doc/html /tmp/docs-html
+    - git clean -fdx
+    - CI=gitlab BUILD_TYPE=autotools CC=clang WITH_DOCS=0 contrib/scripts/nm-ci-run.sh
+    - git clean -fdx
+    - CI=gitlab BUILD_TYPE=meson     CC=gcc   WITH_DOCS=1 contrib/scripts/nm-ci-run.sh
+    - git clean -fdx
+    - CI=gitlab BUILD_TYPE=meson     CC=clang WITH_DOCS=0 contrib/scripts/nm-ci-run.sh
+    - git clean -fdx
+    - ./contrib/fedora/rpm/build_clean.sh -g -w crypto_gnutls -w debug -w iwd -w test
+    - ./contrib/fedora/rpm/build_clean.sh -g -w crypto_gnutls -w debug -w iwd -w test -w meson
+
 checkpatch:
   image: fedora:28
   stage: test
@@ -27,58 +42,30 @@ checkpatch:
     paths:
       - checkpatch-out.txt
 
-f28_build_autotools:
+f28_build:
   <<: *fedora_install
   image: fedora:28
-  stage: test
-  script:
-    - CI=gitlab BUILD_TYPE=autotools contrib/scripts/nm-ci-run.sh
-    - mv build/INST/share/gtk-doc/html docs-html
+  <<: *fedora_script
   artifacts:
     expire_in: 1 day
     paths:
-      - docs-html
+      - /tmp/docs-html
 
-f28_build_meson:
-  <<: *fedora_install
-  image: fedora:28
-  stage: test
-  script:
-    - CI=gitlab BUILD_TYPE=meson contrib/scripts/nm-ci-run.sh
-
-f28_rpm_autotools_dbg:
-  <<: *fedora_install
-  image: fedora:28
-  stage: test
-  script:
-    - ./contrib/fedora/rpm/build_clean.sh -g -w crypto_gnutls -w debug -w iwd -w test
-
-f28_rpm_meson_dbg:
-  <<: *fedora_install
-  image: fedora:28
-  stage: test
-  script:
-    - ./contrib/fedora/rpm/build_clean.sh -g -w crypto_gnutls -w debug -w iwd -w meson -w test
-
-f_latest_build_autotools:
+f_latest_build:
   <<: *fedora_install
   image: fedora:latest
-  stage: test
-  script:
-    - CI=gitlab BUILD_TYPE=autotools contrib/scripts/nm-ci-run.sh
+  <<: *fedora_script
 
-f_rawhide_build_autotools:
+f_rawhide_build:
   <<: *fedora_install
   image: fedora:rawhide
-  stage: test
-  script:
-    - CI=gitlab BUILD_TYPE=autotools contrib/scripts/nm-ci-run.sh
+  <<: *fedora_script
   allow_failure: true
 
 pages:
   stage: deploy
   dependencies:
-    - f28_build_autotools
+    - f28_build
   script:
     - mv docs-html public
   artifacts:

contrib/scripts/nm-ci-run.sh

@@ -28,6 +28,10 @@ _is_true() {
     esac
 }
 
+if which ccache &>/dev/null; then
+    export PATH="/usr/lib64/ccache:/usr/lib/ccache${PATH:+:${PATH}}"
+fi
+
 ###############################################################################
 
 if [ "$BUILD_TYPE" == meson ]; then