Bug 1516568 - Add jobs to cross-compile cargo test binaries and run them on macOS. r=glandium

Similar to the previous patch, this adds two jobs. One that
cross-compiles the binaries produced by `cargo test` and publishes them
as an artifact. The other job downloads the artifact and runs the
resulting binaries.

Differential Revision: https://phabricator.services.mozilla.com/D19370

--HG--
extra : moz-landing-system : lando

taskcluster/ci/webrender/kind.yml

@@ -153,6 +153,64 @@ jobs:
             files-changed:
                 - 'gfx/wr/**'
 
+    cargotest-macos-build:
+        description: Cross compilation of cargo tests for macOS on Linux
+        worker-type: aws-provisioner-v1/gecko-{level}-b-linux
+        worker:
+            docker-image: {in-tree: webrender}
+            env:
+                TOOLTOOL_MANIFEST: "/builds/worker/checkouts/gecko/browser/config/tooltool-manifests/macosx64/cross-releng.manifest"
+            chain-of-trust: true
+            artifacts:
+                - type: file
+                  name: public/build/cargo-test-binaries.tar.bz2
+                  path: /builds/worker/artifacts/cargo-test-binaries.tar.bz2
+        toolchains:
+            - linux64-rust-macos
+            - linux64-cctools-port
+            - linux64-clang
+            - linux64-llvm-dsymutil
+            - wrench-deps
+        run:
+            using: run-task
+            tooltool-downloads: internal
+            command: '$HOME/checkouts/gecko/taskcluster/scripts/misc/wr-cargotest-macos-build.sh'
+        treeherder:
+            platform: macosx64-qr/debug
+            symbol: WR(B)
+        when:
+            files-changed:
+                - 'gfx/wr/**'
+                - 'taskcluster/scripts/misc/tooltool-download.sh'
+                - 'taskcluster/scripts/misc/wr-cargotest-macos-build.sh'
+                - 'taskcluster/scripts/misc/wr-macos-cross-build-setup.sh'
+
+    macos-debug:
+        description: Runs debug-mode WebRender CI tests on a macOS worker
+        worker-type: releng-hardware/gecko-t-osx-1010
+        worker:
+            max-run-time: 3600
+            env:
+                MOZ_FETCHES_DIR: 'checkouts/gecko/gfx/wr'
+        dependencies:
+            webrender-cargotest-macos-build: webrender-cargotest-macos-build
+        fetches:
+            webrender-cargotest-macos-build:
+                - 'cargo-test-binaries.tar.bz2'
+        run:
+            using: run-task
+            command: >-
+                cd $GECKO_PATH/gfx/wr &&
+                mv cargo-test-binaries target &&
+                cd target &&
+                for i in debug/*; do $i; done
+        treeherder:
+            platform: macosx64-qr/debug
+            symbol: WR(cargotest)
+        when:
+            files-changed:
+                - 'gfx/wr/**'
+
     windows:
         description: Runs WebRender CI tests on a Windows worker
         worker-type: aws-provisioner-v1/gecko-t-win10-64

taskcluster/scripts/misc/wr-cargotest-macos-build.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+set -x -e -v
+
+source ${GECKO_PATH}/taskcluster/scripts/misc/wr-macos-cross-build-setup.sh
+
+export UPLOAD_DIR="${HOME}/artifacts"
+mkdir -p "${UPLOAD_DIR}"
+
+# Do a cross-build for cargo test run
+pushd "${GECKO_PATH}/gfx/wr"
+CARGOFLAGS="-vv --frozen --target=${TARGET_TRIPLE}" \
+    CARGOTESTFLAGS="--no-run" \
+    ci-scripts/macos-debug-tests.sh
+# Package up the test binaries
+cd "target/${TARGET_TRIPLE}"
+mkdir cargo-test-binaries
+mv debug cargo-test-binaries/
+find cargo-test-binaries -type f -maxdepth 2 -executable -print0 > binaries.lst
+tar cjf cargo-test-binaries.tar.bz2 -T binaries.lst --null
+mv cargo-test-binaries.tar.bz2 "${UPLOAD_DIR}"
+# Clean the build
+cd "${GECKO_PATH}/gfx/wr"
+rm -rf target
+popd