bazel: add mobile platform mappings

As part of supporting rust in envoy and envoy mobile we have to use the
newer bazel mechanisms for changing platforms. During the transition
between the old version (which the android + iOS toolchains use) and the
new version (used by rules_rust), we have to provide some mappings for
the specific platforms. We could do this in envoy-mobile only if we'd
prefer, but since there is already some mobile specific build infra in
this repo I chose to put it here first.

Signed-off-by: Keith Smiley <keithbsmiley@gmail.com>

.bazelrc

@@ -18,6 +18,7 @@ build --incompatible_strict_action_env
 build --host_force_python=PY3
 build --java_runtime_version=remotejdk_11
 build --tool_java_runtime_version=remotejdk_11
+build --platform_mappings=bazel/platform_mappings
 
 build --enable_platform_specific_config
 

bazel/BUILD

@@ -637,3 +637,78 @@ json_data(
         load_repository_locations_spec(API_REPOSITORY_LOCATIONS_SPEC),
     ),
 )
+
+platform(
+    name = "android_aarch64",
+    constraint_values = [
+        "@platforms//cpu:aarch64",
+        "@platforms//os:android",
+    ],
+)
+
+platform(
+    name = "android_armeabi",
+    constraint_values = [
+        "@platforms//cpu:arm",  # TODO(keith): This should be armv7 https://github.com/bazelbuild/bazel/issues/14982
+        "@platforms//os:android",
+    ],
+)
+
+platform(
+    name = "android_x86",
+    constraint_values = [
+        "@platforms//cpu:x86_32",
+        "@platforms//os:android",
+    ],
+)
+
+platform(
+    name = "android_x86_64",
+    constraint_values = [
+        "@platforms//cpu:x86_64",
+        "@platforms//os:android",
+    ],
+)
+
+platform(
+    name = "macos_x86_64",
+    constraint_values = [
+        "@platforms//cpu:x86_64",
+        "@platforms//os:macos",
+    ],
+)
+
+platform(
+    name = "macos_arm64",
+    constraint_values = [
+        "@platforms//cpu:arm64",
+        "@platforms//os:macos",
+    ],
+)
+
+platform(
+    name = "ios_x86_64_platform",  # TODO(keith): Resolve duplicate name issue
+    constraint_values = [
+        "@platforms//cpu:x86_64",
+        "@platforms//os:ios",
+        "@build_bazel_apple_support//constraints:simulator",
+    ],
+)
+
+platform(
+    name = "ios_sim_arm64",
+    constraint_values = [
+        "@platforms//cpu:arm64",
+        "@platforms//os:ios",
+        "@build_bazel_apple_support//constraints:simulator",
+    ],
+)
+
+platform(
+    name = "ios_arm64_platform",  # TODO(keith): Resolve duplicate name issue
+    constraint_values = [
+        "@platforms//cpu:arm64",
+        "@platforms//os:ios",
+        "@build_bazel_apple_support//constraints:device",
+    ],
+)

bazel/platform_mappings

@@ -0,0 +1,36 @@
+flags:
+  --cpu=arm64-v8a
+  --crosstool_top=//external:android/crosstool
+    @envoy//bazel:android_aarch64
+
+  --cpu=armeabi-v7a
+  --crosstool_top=//external:android/crosstool
+    @envoy//bazel:android_armeabi
+
+  --cpu=x86
+  --crosstool_top=//external:android/crosstool
+    @envoy//bazel:android_x86
+
+  --cpu=x86_64
+  --crosstool_top=//external:android/crosstool
+    @envoy//bazel:android_x86_64
+
+  --cpu=darwin_x86_64
+  --apple_platform_type=macos
+    @envoy//bazel:macos_x86_64
+
+  --cpu=darwin_arm64
+  --apple_platform_type=macos
+    @envoy//bazel:macos_arm64
+
+  --cpu=ios_x86_64
+  --apple_platform_type=ios
+    @envoy//bazel:ios_x86_64_platform
+
+  --cpu=ios_sim_arm64
+  --apple_platform_type=ios
+    @envoy//bazel:ios_sim_arm64
+
+  --cpu=ios_arm64
+  --apple_platform_type=ios
+    @envoy//bazel:ios_arm64_platform

ci/filter_example_setup.sh

@@ -24,6 +24,7 @@ sed -e "s|{ENVOY_SRCDIR}|${ENVOY_SRCDIR}|" "${ENVOY_SRCDIR}"/ci/WORKSPACE.filter
 
 mkdir -p "${ENVOY_FILTER_EXAMPLE_SRCDIR}"/bazel
 ln -sf "${ENVOY_SRCDIR}"/bazel/get_workspace_status "${ENVOY_FILTER_EXAMPLE_SRCDIR}"/bazel/
+ln -sf "${ENVOY_SRCDIR}"/bazel/platform_mappings "${ENVOY_FILTER_EXAMPLE_SRCDIR}"/bazel/
 cp -f "${ENVOY_SRCDIR}"/.bazelrc "${ENVOY_FILTER_EXAMPLE_SRCDIR}"/
 rm -f "${ENVOY_FILTER_EXAMPLE_SRCDIR}"/.bazelversion
 cp -f "${ENVOY_SRCDIR}"/.bazelversion "${ENVOY_FILTER_EXAMPLE_SRCDIR}"/