Update emsdk, work with Abseil + RE2

.bazelrc

@@ -0,0 +1,3 @@
+# Claimed to be required for emsdk:
+# https://github.com/emscripten-core/emsdk/blob/main/bazel/README.md
+build --incompatible_enable_cc_toolchain_resolution

bazel/defs.bzl

@@ -18,8 +18,17 @@ load("@rules_cc//cc:defs.bzl", "cc_binary")
 def _optimized_wasm_cc_binary_transition_impl(settings, attr):
     # TODO(PiotrSikora): Add -flto to copts/linkopts when fixed in emsdk.
     # See: https://github.com/emscripten-core/emsdk/issues/971
+    #
+    # Define STANDALONE_WASM at compile time as well as link time (below).
+    # This influences Abseil libraries using conditional dependencies.
+    # TODO(martijneken): Remove after Abseil stops using this define.
+    #
+    # Disable warning -Wdeprecated-non-prototype for zlib:
+    # https://github.com/madler/zlib/issues/633
+    # This is fixed in more recent versions of zlib / protobuf.
+    # TODO(martijneken): Remove after protobuf version update.
     return {
-        "//command_line_option:copt": ["-O3"],
+        "//command_line_option:copt": ["-O3", "-DSTANDALONE_WASM", "-Wno-deprecated-non-prototype"],
         "//command_line_option:cxxopt": [],
         "//command_line_option:linkopt": [],
         "//command_line_option:collect_code_coverage": False,
@@ -91,7 +100,6 @@ def proxy_wasm_cc_binary(
         linkopts = linkopts + [
             "--no-entry",
             "--js-library=$(location @proxy_wasm_cpp_sdk//:proxy_wasm_intrinsics_js)",
-            "-sSTANDALONE_WASM",
             "-sEXPORTED_FUNCTIONS=_malloc",
         ],
         tags = tags + [
@@ -102,6 +110,8 @@ def proxy_wasm_cc_binary(
     )
 
     wasm_cc_binary(
+        standalone = True,
+        threads = "off",
         name = "wasm_" + name,
         cc_target = ":proxy_wasm_" + name.rstrip(".wasm"),
         tags = tags + [

bazel/dependencies_extra.bzl

@@ -13,7 +13,9 @@
 #  limitations under the License.
 
 load("@emsdk//:emscripten_deps.bzl", "emscripten_deps")
+load("@emsdk//:toolchains.bzl", "register_emscripten_toolchains")
 
 # Requires proxy_wasm_cpp_sdk_dependencies() to be loaded first.
 def proxy_wasm_cpp_sdk_dependencies_extra():
     emscripten_deps()
+    register_emscripten_toolchains()

bazel/emsdk.patch

@@ -1,9 +1,9 @@
 diff --git a/bazel/emscripten_deps.bzl b/bazel/emscripten_deps.bzl
-index 95801ba..95fdabd 100644
+index 219cd93..c127d49 100644
 --- a/bazel/emscripten_deps.bzl
 +++ b/bazel/emscripten_deps.bzl
-@@ -69,31 +69,3 @@ def emscripten_deps(emscripten_version = "latest"):
-             build_file = "@emsdk//emscripten_toolchain:emscripten.BUILD",
+@@ -167,38 +167,3 @@ def emscripten_deps(emscripten_version = "latest"):
+             build_file_content = BUILD_FILE_CONTENT_TEMPLATE.format(bin_extension = ".exe"),
              type = "zip",
          )
 -
@@ -14,6 +14,13 @@ index 95801ba..95fdabd 100644
 -            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",
@@ -34,15 +41,3 @@ index 95801ba..95fdabd 100644
 -            package_json = "@emscripten_bin_win//:emscripten/package.json",
 -            package_lock_json = "@emscripten_bin_win//:emscripten/package-lock.json",
 -        )
-diff --git a/bazel/emscripten_toolchain/BUILD.bazel b/bazel/emscripten_toolchain/BUILD.bazel
-index eb36959..12dba37 100644
---- a/bazel/emscripten_toolchain/BUILD.bazel
-+++ b/bazel/emscripten_toolchain/BUILD.bazel
-@@ -13,7 +13,6 @@ filegroup(
-         "env.sh",
-         "env.bat",
-         "@emsdk//:binaries",
--        "@emsdk//:node_modules",
-         "@nodejs//:node_files",
-     ],
- )

bazel/repositories.bzl

@@ -19,10 +19,10 @@ def proxy_wasm_cpp_sdk_repositories():
     maybe(
         http_archive,
         name = "emsdk",
-        sha256 = "1ca0ff918d476c55707bb99bc0452be28ac5fb8f22a9260a8aae8a38d1bc0e27",
-        # v3.1.7 with Bazel fixes
-        strip_prefix = "emsdk-0ea8f8a8707070e9a7c83fbb4a3065683bcf1799/bazel",
-        url = "https://github.com/emscripten-core/emsdk/archive/0ea8f8a8707070e9a7c83fbb4a3065683bcf1799.tar.gz",
+        sha256 = "d9e084ef352adaa4a15470f0dfc675fe8cab1a4e4d1720fb2e7547f31c3b5d40",
+        # v3.1.67
+        strip_prefix = "emsdk-a2383b33581adb7383c8f874d2dc34e07d055332/bazel",
+        url = "https://github.com/emscripten-core/emsdk/archive/a2383b33581adb7383c8f874d2dc34e07d055332.tar.gz",
         patches = ["@proxy_wasm_cpp_sdk//bazel:emsdk.patch"],
         patch_args = ["-p2"],
     )