[tracker/wip/carlosg/ci-playground] ci: Add macos build task

[Carlos Garnacho <carlosg src gnome org>]

commit 78ea379fe42a2bdca01d7f9c079fa31c081cdf00
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun May 16 16:57:40 2021 +0200

    ci: Add macos build task

 .gitlab-ci.yml        | 19 +++++++++++++++++++
 meson.build           | 10 +++++++++-
 subprojects/vala.wrap |  5 +++++
 3 files changed, 33 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 09243009f..00d0daebb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -208,6 +208,25 @@ build-alpine-edge@x86_64:
     - build-alpine-container@x86_64
   <<: *build
 
+build-macos:
+  stage: build
+  tags:
+    - macos
+  needs: []
+  before_script:
+    - pip3 install --user meson==0.56
+    - pip3 install --user ninja
+    - export PATH=/Users/gitlabrunner/Library/Python/3.7/bin:$PATH
+    - export MESON_FORCE_BACKTRACE=1
+    - brew install vala
+  script:
+    - meson _build
+    - ninja -C _build
+  artifacts:
+    when: always
+    paths:
+      - _build/meson-logs
+
 .test-template: &test
   stage: test
   variables:
diff --git a/meson.build b/meson.build
index 44e8fbbfc..4fc92eb71 100644
--- a/meson.build
+++ b/meson.build
@@ -1,10 +1,18 @@
-project('tracker', 'c', 'vala',
+project('tracker', 'c',
         version: '3.2.0-alpha',
         meson_version: '>=0.51',
         default_options: [
           'c_std=c99',
           'warning_level=3'])
 
+vapigen = dependency('vapigen', required:false)
+
+if not vapigen.found()
+  subproject('vala')
+endif
+
+add_languages('vala')
+
 gnome = import('gnome')
 i18n = import('i18n')
 pkg = import('pkgconfig')
diff --git a/subprojects/vala.wrap b/subprojects/vala.wrap
new file mode 100644
index 000000000..c81346240
--- /dev/null
+++ b/subprojects/vala.wrap
@@ -0,0 +1,5 @@
+[wrap-git]
+directory=vala
+url=https://gitlab.gnome.org/GNOME/vala
+revision=master
+depth=1