emscripten

distdir_deps.bzl

@@ -31,6 +31,8 @@ DIST_DEPS = {
             "https://mirror.bazel.build/github.com/bazelbuild/platforms/releases/download/0.0.5/platforms-0.0.5.tar.gz",
             "https://github.com/bazelbuild/platforms/releases/download/0.0.5/platforms-0.0.5.tar.gz",
         ],
+        "patch_args": ["-p1"],
+        "patches": ["//third_party/platforms:emscripten.patch"],
         "used_in": [
             "additional_distfiles",
             "test_WORKSPACE_files",

third_party/platforms/emscripten.patch

@@ -0,0 +1,26 @@
+From a0a45fa9810f8b72066bcdd2540e81a6e3654ae0 Mon Sep 17 00:00:00 2001
+From: Walter Lee <waltl@google.com>
+Date: Fri, 5 Jan 2024 22:08:40 -0500
+Subject: [PATCH] Define constraint for emscripten os
+
+This is to be used for Web Assembly, with cpus wasm32/wasm64.
+---
+ os/BUILD | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/os/BUILD b/os/BUILD
+index ae6e8b0..8e9f990 100644
+--- a/os/BUILD
++++ b/os/BUILD
+@@ -106,6 +106,11 @@ constraint_value(
+     constraint_setting = ":os",
+ )
+
++constraint_value(
++    name = "emscripten",
++    constraint_setting = ":os",
++)
++
+ # WASI (WebAssembly System Interface)
+ # https://github.com/bytecodealliance/wasmtime/blob/main/docs/WASI-overview.md
+ constraint_value(