Add linux/arm64 support to bazel rules (#1156)

* Add linux/arm64 support to bazel rules

* Make linux arm64 sha optional and PR feedback

Not all releases have linux shas. Use getattr to default to no sha if none was
present. This way non linux arm64 builds should not fail.

* Update linux arm64 sha for 3.1.33

This is the latest arm64 release according to #1204. There do not seem to be a any releases between .21 and .33.

bazel/BUILD

@@ -8,6 +8,14 @@ config_setting(
     ],
 )
 
+config_setting(
+    name = "linux_arm64",
+    constraint_values = [
+        "@platforms//os:linux",
+        "@platforms//cpu:arm64",
+    ],
+)
+
 config_setting(
     name = "macos",
     constraint_values = [
@@ -38,6 +46,7 @@ alias(
     name = "compiler_files",
     actual = select({
         ":linux": "@emscripten_bin_linux//:compiler_files",
+        ":linux_arm64": "@emscripten_bin_linux_arm64//:compiler_files",
         ":macos": "@emscripten_bin_mac//:compiler_files",
         ":macos_arm64": "@emscripten_bin_mac_arm64//:compiler_files",
         ":windows": "@emscripten_bin_win//:compiler_files",
@@ -49,6 +58,7 @@ alias(
     name = "linker_files",
     actual = select({
         ":linux": "@emscripten_bin_linux//:linker_files",
+        ":linux_arm64": "@emscripten_bin_linux_arm64//:linker_files",
         ":macos": "@emscripten_bin_mac//:linker_files",
         ":macos_arm64": "@emscripten_bin_mac_arm64//:linker_files",
         ":windows": "@emscripten_bin_win//:linker_files",
@@ -60,6 +70,7 @@ alias(
     name = "ar_files",
     actual = select({
         ":linux": "@emscripten_bin_linux//:ar_files",
+        ":linux_arm64": "@emscripten_bin_linux_arm64//:ar_files",
         ":macos": "@emscripten_bin_mac//:ar_files",
         ":macos_arm64": "@emscripten_bin_mac_arm64//:ar_files",
         ":windows": "@emscripten_bin_win//:ar_files",

bazel/emscripten_deps.bzl

@@ -127,6 +127,17 @@ def emscripten_deps(emscripten_version = "latest"):
             type = "tar.bz2",
         )
 
+    if "emscripten_bin_linux_arm64" not in excludes:
+        http_archive(
+            name = "emscripten_bin_linux_arm64",
+            strip_prefix = "install",
+            url = emscripten_url.format("linux", revision.hash, "-arm64", "tbz2"),
+            # Not all versions have a linux/arm64 release: https://github.com/emscripten-core/emsdk/issues/547
+            sha256 = getattr(revision, "sha_linux_arm64", None),
+            build_file_content = BUILD_FILE_CONTENT_TEMPLATE.format(bin_extension = ""),
+            type = "tar.bz2",
+        )
+
     if "emscripten_bin_mac" not in excludes:
         http_archive(
             name = "emscripten_bin_mac",
@@ -164,6 +175,13 @@ def emscripten_deps(emscripten_version = "latest"):
             package_lock_json = "@emscripten_bin_linux//:emscripten/package-lock.json",
         )
 
+    if "emscripten_npm_linux_arm64" not in excludes:
+        npm_install(
+            name = "emscripten_npm_linux_arm64",
+            package_json = "@emscripten_bin_linux_arm64//:emscripten/package.json",
+            package_lock_json = "@emscripten_bin_linux_arm64//:emscripten/package-lock.json",
+        )
+
     if "emscripten_npm_mac" not in excludes:
         npm_install(
             name = "emscripten_npm_mac",

bazel/emscripten_toolchain/emscripten_config

@@ -9,7 +9,7 @@ FROZEN_CACHE = True
 
 system = platform.system()
 
-machine = "arm64" if platform.machine() == "arm64" else "amd64"
+machine = "arm64" if platform.machine() in ('arm64', 'aarch64') else "amd64"
 nodejs_binary = "bin/nodejs/node.exe" if(system =="Windows") else "bin/node"
 NODE_JS = ROOT_DIR + "/external/nodejs_{}_{}/{}".format(system.lower(), machine, nodejs_binary)
 

bazel/revisions.bzl

@@ -12,6 +12,7 @@ EMSCRIPTEN_TAGS = {
     "3.1.33": struct(
         hash = "49b960bd03b3a9da478a08541ce6eafe792a58a8",
         sha_linux = "eab02b3f4b7c076974452ba602f908a36adf597afa15b16095b441f191ede1bb",
+        sha_linux_arm64 = "5e15af6affcf37c9ce6c304b4aeccb87a2758e1ef029dbc996f9d77d7444378e",
         sha_mac = "b8dad3cddb19c1daf9dae99020bd17b903ae9649cfc58e433ea4951e758804de",
         sha_mac_arm64 = "fbf03d06c7503f091191e440b8ea577d65b3261167cdb47359d053f12888974b",
         sha_win = "031f951668eaeea39bd9363abb3f514efc3401506374984fa9b1d7ba3130a62f",
@@ -96,6 +97,7 @@ EMSCRIPTEN_TAGS = {
     "3.1.21": struct(
         hash = "a16a8bca2466eb144f7c93fa899c0272c8815dc3",
         sha_linux = "7045ddb3b37a2cc63cb1cf976019a6a3b7f8dbdc71254db0eee5b0452f94e9e7",
+        sha_linux_arm64 = "2852c8b108ec748d52d31dab3f4854bc6022df008019daff1c7e31ac00363b3f",
         sha_mac = "2a8d3d3ad721fec81ca1a4a581e4183b6e732e9905beb874531851846a05a367",
         sha_mac_arm64 = "cf788a7bdc38bb40d01f94b2d46acafb0e2f02d8ee3b3d69541c114e467ee37f",
         sha_win = "81518bba13f41717ffe6990b6d4a5af635d0c9d0f71a8d3bc0980cd0bc8f5f66",