ci: Add FreeBSD support

Use qemu to do CI on FreeBSD.
Not everything is compiled as all arm aren't supported on FreeBSD.
Same thing for Nouveau.
The tests aren't enable for now as they are all failing.

Signed-off-by: Emmanuel Vadot <manu@FreeBSD.org>

.gitlab-ci.yml

@@ -19,6 +19,7 @@ include:
     ref: *template_sha
     file:
     - '/templates/debian.yml'
+    - '/templates/freebsd.yml'
     - '/templates/ci-fairy.yml'
 
 variables:
@@ -63,6 +64,21 @@ stages:
   variables:
     BUILD_ARCH: "armv7"
 
+.os-freebsd:
+  variables:
+    BUILD_OS: freebsd
+    FDO_DISTRIBUTION_VERSION: "13.0"
+    FDO_DISTRIBUTION_PACKAGES: 'meson ninja pkgconf libpciaccess libpthread-stubs py38-docutils cairo'
+    # bump this tag every time you change something which requires rebuilding the
+    # base image
+    FDO_DISTRIBUTION_TAG: "2021-11-10.1"
+
+.freebsd-x86_64:
+  extends:
+    - .os-freebsd
+  variables:
+    BUILD_ARCH: "x86_64"
+
 # Build our base container image, which contains the core distribution, the
 # toolchain, and all our build dependencies. This will be reused in the build
 # stage.
@@ -98,6 +114,15 @@ armv7-debian-container_prep:
     GIT_STRATEGY: none
     FDO_BASE_IMAGE: "arm32v7/debian:$FDO_DISTRIBUTION_VERSION"
 
+x86_64-freebsd-container_prep:
+  extends:
+    - .ci-rules
+    - .freebsd-x86_64
+    - .fdo.qemu-build@freebsd@x86_64
+  stage: "Base container"
+  variables:
+    GIT_STRATEGY: none
+
 # Core build environment.
 .build-env:
   variables:
@@ -142,6 +167,20 @@ armv7-debian-container_prep:
     - job: armv7-debian-container_prep
       artifacts: false
 
+.build-env-freebsd-x86_64:
+  variables:
+    # Compiling with ASan+UBSan appears to trigger an infinite loop in the
+    # compiler shipped with FreeBSD 13.0, so we only use UBSan here.
+    # Additionally, sanitizers can't be used with b_lundef on FreeBSD.
+    MESON_BUILD_TYPE: "-Dbuildtype=debug -Db_sanitize=undefined -Db_lundef=false"
+  extends:
+    - .fdo.suffixed-image@freebsd
+    - .freebsd-x86_64
+    - .build-env
+  needs:
+    - job: x86_64-freebsd-container_prep
+      artifacts: false
+
 # BUILD
 
 .do-build:
@@ -177,6 +216,30 @@ armv7-debian-container_prep:
     paths:
       - build/meson-logs/*
 
+.do-build-qemu:
+  extends:
+    - .ci-rules
+  stage: "Build"
+  script:
+    # Start the VM and copy our workspace to the VM
+    - /app/vmctl start
+    - scp -r $PWD "vm:"
+    # The `set +e is needed to ensure that we always copy the meson logs back to
+    # the workspace to see details about the failed tests.
+    - |
+      set +e
+      /app/vmctl exec "pkg info; cd $CI_PROJECT_NAME ; meson build -D amdgpu=true -D cairo-tests=true -D intel=true -D libkms=true -D man-pages=true -D nouveau=false -D radeon=true -D valgrind=auto && ninja -C build"
+      set -ex
+      scp -r vm:$CI_PROJECT_NAME/build/meson-logs .
+      /app/vmctl exec "ninja -C $CI_PROJECT_NAME/build install"
+      mkdir -p $PREFIX && scp -r vm:$PREFIX/ $PREFIX/
+    # Finally, shut down the VM.
+    - /app/vmctl stop
+  artifacts:
+    when: on_failure
+    paths:
+      - build/meson-logs/*
+
 # Full build and test.
 x86_64-debian-build:
   extends:
@@ -210,3 +273,8 @@ meson-arch-daily:
         valgrind
         python-docutils
   extends: .do-build
+
+x86_64-freebsd-build:
+  extends:
+    - .build-env-freebsd-x86_64
+    - .do-build-qemu