gitlab: Add script_variables and define $MAKEFLAGS there

This new template provides a standardized place where environment
variables which are not static, but rather depend on the output of
some shell command, can be defined for later use. This pattern is
already used in libosinfo's GitLab CI integration.

Defining $MAKEFLAGS there means we don't need to call getconf over
and over, and the actual build steps don't end up drowned in the
noise.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

.gitlab-ci.yml

@@ -7,6 +7,8 @@ stages:
   - native_build
   - cross_build
 
+.script_variables: &script_variables |
+  export MAKEFLAGS="-j$(getconf _NPROCESSORS_ONLN)"
 
 # Common templates
 
@@ -18,6 +20,7 @@ stages:
       - ccache/
     key: "$CI_JOB_NAME"
   before_script:
+    - *script_variables
     - mkdir -p ccache
     - export CC="ccache gcc"
     - export CCACHE_BASEDIR=${PWD}
@@ -26,7 +29,7 @@ stages:
     - mkdir build
     - cd build
     - ../autogen.sh || (cat config.log && exit 1)
-    - $MAKE -j $(getconf _NPROCESSORS_ONLN) distcheck
+    - $MAKE distcheck
 
 # Extra native build jobs that are only run post-merge, or
 # when code is pushed to a branch with "ci-full-" name prefix
@@ -45,6 +48,7 @@ stages:
       - ccache/
     key: "$CI_JOB_NAME"
   before_script:
+    - *script_variables
     - mkdir -p ccache
     - export CC="ccache ${ABI}-gcc"
     - export CCACHE_BASEDIR=${PWD}
@@ -53,7 +57,7 @@ stages:
     - mkdir build
     - cd build
     - ../autogen.sh $CONFIGURE_OPTS || (cat config.log && exit 1)
-    - $MAKE -j $(getconf _NPROCESSORS_ONLN)
+    - $MAKE
 
 # Extra cross build jobs that are only run post-merge, or
 # when code is pushed to a branch with "ci-full-" name prefix
@@ -163,12 +167,14 @@ mingw64-fedora-30:
 #    https://gitlab.com/libvirt/libvirt/-/jobs/artifacts/master/download?job=website
 website:
   stage: prebuild
+  before_script:
+    - *script_variables
   script:
     - mkdir build
     - cd build
     - ../autogen.sh --prefix=$(pwd)/../vroot || (cat config.log && exit 1)
-    - $MAKE -j $(getconf _NPROCESSORS_ONLN) -C docs
-    - $MAKE -j $(getconf _NPROCESSORS_ONLN) -C docs install
+    - $MAKE -C docs
+    - $MAKE -C docs install
     - cd ..
     - mv vroot/share/doc/libvirt/html/ website
   image: quay.io/libvirt/buildenv-libvirt-fedora-31:latest
@@ -183,11 +189,13 @@ website:
 
 codestyle:
   stage: prebuild
+  before_script:
+    - *script_variables
   script:
     - mkdir build
     - cd build
     - ../autogen.sh || (cat config.log && exit 1)
-    - $MAKE -j $(getconf _NPROCESSORS_ONLN) syntax-check
+    - $MAKE syntax-check
   image: quay.io/libvirt/buildenv-libvirt-fedora-31:latest
 
 
@@ -198,12 +206,14 @@ potfile:
   stage: prebuild
   only:
     - master
+  before_script:
+    - *script_variables
   script:
     - mkdir build
     - cd build
     - ../autogen.sh || (cat config.log && exit 1)
-    - $MAKE -j $(getconf _NPROCESSORS_ONLN) -C src generated-sources
-    - $MAKE -j $(getconf _NPROCESSORS_ONLN) -C po libvirt.pot
+    - $MAKE -C src generated-sources
+    - $MAKE -C po libvirt.pot
     - cd ..
     - mv build/po/libvirt.pot libvirt.pot
   image: quay.io/libvirt/buildenv-libvirt-fedora-31:latest
@@ -222,6 +232,8 @@ potfile:
 dco:
   stage: prebuild
   image: quay.io/libvirt/buildenv-libvirt-fedora-31:latest
+  before_script:
+    - *script_variables
   script:
     - ./scripts/require-dco.py
   only: