Bug 1516568 - Update WR mac CI scripts to allow cross-compiling. r=kvark

This introduces some env vars to allow running cross-compiled
binaries instead of running things on the builder. Additionally
the `cargo test --features "ipc"` check is modified to be `check`
instead since there are no actual tests being run by that command.
The only thing we lose is a rustdoc example check but we are
checking that on Linux anyway so doing it for Mac is redundant.

Differential Revision: https://phabricator.services.mozilla.com/D19367

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

gfx/wr/ci-scripts/macos-debug-tests.sh

@@ -8,15 +8,22 @@
 # Users may set the CARGOFLAGS environment variable to pass
 # additional flags to cargo if desired.
 
+# Note that this script is run in a special cross-compiling configuration,
+# where CARGOTESTFLAGS includes `--no-run`, and the binaries produced by
+# `cargo test` are run on a different machine. When making changes to this
+# file, please ensure any such binaries produced by `cargo test` are not
+# deleted, or they may not get run as expected.
+
 set -o errexit
 set -o nounset
 set -o pipefail
 set -o xtrace
 
 CARGOFLAGS=${CARGOFLAGS:-"--verbose"}  # default to --verbose if not set
+CARGOTESTFLAGS=${CARGOTESTFLAGS:-""}
 
 pushd webrender_api
-cargo test ${CARGOFLAGS} --features "ipc"
+cargo check ${CARGOFLAGS} --features "ipc"
 popd
 
 pushd webrender
@@ -35,4 +42,4 @@ pushd examples
 cargo check ${CARGOFLAGS}
 popd
 
-cargo test ${CARGOFLAGS} --all
+cargo test ${CARGOFLAGS} ${CARGOTESTFLAGS} --all

gfx/wr/ci-scripts/macos-release-tests.sh

@@ -7,6 +7,8 @@
 # This must be run from the root webrender directory!
 # Users may set the CARGOFLAGS environment variable to pass
 # additional flags to cargo if desired.
+# The WRENCH_BINARY environment variable, if set, is used to run
+# the precached reftest.
 
 set -o errexit
 set -o nounset
@@ -14,10 +16,14 @@ set -o pipefail
 set -o xtrace
 
 CARGOFLAGS=${CARGOFLAGS:-""}  # default to empty if not set
+WRENCH_BINARY=${WRENCH_BINARY:-""}
 
 pushd wrench
 python script/headless.py reftest
-cargo build ${CARGOFLAGS} --release
-cargo run ${CARGOFLAGS} --release -- --precache \
+if [[ -z "${WRENCH_BINARY}" ]]; then
+    cargo build ${CARGOFLAGS} --release
+    WRENCH_BINARY="../target/release/wrench"
+fi
+"${WRENCH_BINARY}" --precache \
     reftest reftests/clip/fixed-position-clipping.yaml
 popd

gfx/wr/wrench/script/headless.py

@@ -65,13 +65,17 @@ def set_osmesa_env(bin_path):
         os.environ["GALLIUM_DRIVER"] = "softpipe"
 
 
-extra_flags = os.getenv('CARGOFLAGS', None)
-extra_flags = extra_flags.split(' ') if extra_flags else []
-subprocess.check_call(['cargo', 'build'] + extra_flags + ['--release', '--verbose', '--features', 'headless'])
-set_osmesa_env('../target/release/')
+target_folder = os.getenv('WRENCH_HEADLESS_TARGET', None)
+if not target_folder:
+    extra_flags = os.getenv('CARGOFLAGS', None)
+    extra_flags = extra_flags.split(' ') if extra_flags else []
+    subprocess.check_call(['cargo', 'build'] + extra_flags + ['--release', '--verbose', '--features', 'headless'])
+    target_folder = '../target/'
+
+set_osmesa_env(target_folder + 'release/')
 # TODO(gw): We have an occasional accuracy issue or bug (could be WR or OSMesa)
 #           where the output of a previous test that uses intermediate targets can
 #           cause 1.0 / 255.0 pixel differences in a subsequent test. For now, we
 #           run tests with no-scissor mode, which ensures a complete target clear
 #           between test runs. But we should investigate this further...
-subprocess.check_call(['../target/release/wrench', '--no-scissor', '-h'] + sys.argv[1:])
+subprocess.check_call([target_folder + 'release/wrench', '--no-scissor', '-h'] + sys.argv[1:])