[ci] Add basic support for Meson builds with MSVC on Windows.

This adds meson jobs for VS2017 (x86 and x86_64).

* .gitlab-ci.yml: New file.

.gitlab-ci.yml

@@ -0,0 +1,54 @@
+stages:
+ - build
+
+# FIXME: Use --werror once warnings are fixed.
+variables:
+  MESON_ARGS: --fatal-meson-warnings
+  MESON_ARGS_WINDOWS: ${MESON_ARGS} --force-fallback-for=zlib
+
+.build meson windows:
+  # See
+  #   https://gitlab.freedesktop.org/gstreamer/gst-ci/container_registry/213
+  image: 'registry.freedesktop.org/gstreamer/gst-ci/amd64/windows:v14-master'
+  stage: 'build'
+  tags:
+    - 'docker'
+    - 'windows'
+    - '1809'
+    - 'gstreamer-windows'
+  variables:
+    # Make sure any failure in PowerShell scripts is fatal.
+    ErrorActionPreference: 'Stop'
+    WarningPreference: 'Stop'
+    # Uncomment the following key if need to pass custom args, as well with
+    # the `$env:MESON_ARGS` line in the `script:` blocks.
+    # MESON_ARGS: >-
+    #   -Dfoo=enabled
+    #   -Dbar=disabled
+  before_script:
+    # Make sure meson is up to date, so we don't need to rebuild the image
+    # with each release.
+    - pip3 install -U meson ninja
+  script:
+    # For some reason, options are separated by newlines instead of spaces,
+    # so we have to replace them first.
+    #- $env:MESON_ARGS = $env:MESON_ARGS.replace("`n"," ")
+    # Gitlab executes PowerShell in docker, but `VsDevCmd.bat` is a batch
+    # script.  Environment variables substitutions is done by PowerShell
+    # before calling `cmd.exe`, that's why we use `$env:FOO` instead of
+    # `%FOO%`.
+    - cmd.exe /C "C:\BuildTools\Common7\Tools\VsDevCmd.bat -host_arch=amd64 -arch=$env:ARCH &&
+        meson setup build $env:MESON_ARGS_WINDOWS &&
+        meson compile --verbose -C build &&
+        meson test -C build &&
+        meson test -C build --benchmark"
+
+meson vs2017 amd64:
+  extends: '.build meson windows'
+  variables:
+    ARCH: 'amd64'
+
+meson vs2017 x86:
+  extends: '.build meson windows'
+  variables:
+    ARCH: 'x86'

ChangeLog

@@ -1,3 +1,11 @@
+2021-03-07  Tim-Philipp Müller  <tim@centricular.com>
+
+	[ci] Add basic support for Meson builds with MSVC on Windows.
+
+	This adds meson jobs for VS2017 (x86 and x86_64).
+
+	* .gitlab-ci.yml: New file.
+
 2021-03-07  Tim-Philipp Müller  <tim@centricular.com>
 
 	[meson] Add subproject fallbacks for 'libpng' and 'zlib'.