add wasm config

.bazelrc

@@ -2,4 +2,14 @@ build --enable_platform_specific_config
 build --cxxopt='-std=c++17'
 build --compilation_mode=opt
 
+# WebAssembly Builds
+build:wasm --crosstool_top=@emsdk//emscripten_toolchain:everything
+build:wasm --cpu=wasm
+build:wasm --copt='-Wno-unused-variable'
+build:wasm --copt='-Wno-unused-but-set-variable'
+build:wasm --copt='-Wno-unused-function'
+build:wasm --copt='-Wno-deprecated-declarations'
+build:wasm --copt='-fexceptions'
+build:wasm --host_crosstool_top=@bazel_tools//tools/cpp:toolchain
+
 test --test_output errors

WORKSPACE

@@ -98,3 +98,17 @@ http_jar(
     sha256 = "a036ac9392ff6f2e668791324c26bd73963b09682ed4a0d4cbc117fd6ea3fe55",
     url = "https://github.com/google/google-java-format/releases/download/v1.13.0/google-java-format-1.13.0-all-deps.jar",
 )
+
+#
+http_archive(
+    name = "emsdk",
+    sha256 = "d55e3c73fc4f8d1fecb7aabe548de86bdb55080fe6b12ce593d63b8bade54567",
+    strip_prefix = "emsdk-3891e7b04bf8cbb3bc62758e9c575ae096a9a518/bazel",
+    url = "https://github.com/emscripten-core/emsdk/archive/3891e7b04bf8cbb3bc62758e9c575ae096a9a518.tar.gz",
+)
+
+load("@emsdk//:deps.bzl", emsdk_deps = "deps")
+emsdk_deps()
+
+load("@emsdk//:emscripten_deps.bzl", emsdk_emscripten_deps = "emscripten_deps")
+emsdk_emscripten_deps(emscripten_version = "2.0.31")