envoy: fix builds for x86_64-linux and aarch64-linux

* Bumps brotli version to incorporate a fix for some GCC warnings which
  get promoted to errors.
* Switches from wee8 to WAMR because it's easier to make it build
  sensibly on a range of GCC versions that aren't just "whatever ships
  with Ubuntu LTS".
* Adds a patch for WAMR's build in Envoy because it won't build properly
  under Linux aarch64, since WAMR doesn't detect aarch64 unless it's on
  macOS.

pkgs/servers/http/envoy/bump-brotli.patch

@@ -0,0 +1,15 @@
+diff --git a/bazel/repository_locations.bzl b/bazel/repository_locations.bzl
+index 454c54b0ef..2ac0623cf0 100644
+--- a/bazel/repository_locations.bzl
++++ b/bazel/repository_locations.bzl
+@@ -510,8 +510,8 @@ REPOSITORY_LOCATIONS_SPEC = dict(
+         project_url = "https://brotli.org",
+         # Use the dev branch of brotli to resolve compilation issues.
+         # TODO(rojkov): Remove when brotli > 1.0.9 is released.
+-        version = "0cd2e3926e95e7e2930f57ae3f4885508d462a25",
+-        sha256 = "93810780e60304b51f2c9645fe313a6e4640711063ed0b860cfa60999dd256c5",
++        version = "27dd7265403d8e8fed99a854b9c3e1db7d79525f",
++        sha256 = "e71238b12e30233bdf25997132b29ae49639a69f33fdef3ae18a47abfc0d5e4c",
+         strip_prefix = "brotli-{version}",
+         urls = ["https://github.com/google/brotli/archive/{version}.tar.gz"],
+         use_category = ["dataplane_ext"],

pkgs/servers/http/envoy/default.nix

@@ -12,6 +12,9 @@
 , python3
 , linuxHeaders
 , nixosTests
+
+# v8 (upstream default), wavm, wamr, wasmtime, disabled
+, wasmRuntime ? "wamr"
 }:
 
 let
@@ -31,7 +34,7 @@ buildBazelPackage rec {
   src = fetchFromGitHub {
     owner = "envoyproxy";
     repo = "envoy";
-    inherit (srcVer) rev ;
+    inherit (srcVer) rev;
     hash = "sha256:11mm72zmb479ss585jzqzhklyyqmdadnvr91ghzvjxc0j2a1hrr4";
 
     extraPostFetch = ''
@@ -58,6 +61,13 @@ buildBazelPackage rec {
       url = "https://github.com/envoyproxy/envoy/commit/68448aae7a78a3123097b6ea96016b270457e7b8.patch";
       sha256 = "123kv3x37p8fgfp29jhw5xg5js5q5ipibs8hsm7gzfd5bcllnpfh";
     })
+
+    # fix issues with brotli and GCC 11.2.0+ (-Werror=vla-parameter)
+    ./bump-brotli.patch
+
+    # fix linux-aarch64 WAMR builds
+    # (upstream WAMR only detects aarch64 on Darwin, not Linux)
+    ./fix-aarch64-wamr.patch
   ];
 
   nativeBuildInputs = [
@@ -75,8 +85,8 @@ buildBazelPackage rec {
 
   fetchAttrs = {
     sha256 = {
-      x86_64-linux = "0f7mls2zrpjjvbz6pgkzrvr55bv05xn2l76j9i1r0cf367qqfkz8";
-      aarch64-linux = "1l3ls47z20xrw6x9qps5jm7vq50xb1acv9gczfdrj9hw6jybgwgg";
+      x86_64-linux = "0k2cna0vjzc8z7jvxdlcw741vacil8daczppv32bslw17af65vq6";
+      aarch64-linux = "1ijv4arw67nprykn2wkn4ji8fbr284mc7p74zxfsky772s42yy9j";
     }.${stdenv.system} or (throw "unsupported system ${stdenv.system}");
     dontUseCmakeConfigure = true;
     dontUseGnConfigure = true;
@@ -128,6 +138,11 @@ buildBazelPackage rec {
     "--cxxopt=-Wno-maybe-uninitialized"
     "--cxxopt=-Wno-uninitialized"
     "--cxxopt=-Wno-error=type-limits"
+
+    "--define=wasm=${wasmRuntime}"
+  ];
+  bazelFetchFlags = [
+    "--define=wasm=${wasmRuntime}"
   ];
 
   passthru.tests = {

pkgs/servers/http/envoy/fix-aarch64-wamr.patch

@@ -0,0 +1,38 @@
+diff --git a/bazel/envoy_build_system.bzl b/bazel/envoy_build_system.bzl
+index f48ebe7056..1e5cc5d663 100644
+--- a/bazel/envoy_build_system.bzl
++++ b/bazel/envoy_build_system.bzl
+@@ -102,6 +102,7 @@ def envoy_cmake(
+         pdb_name = "",
+         cmake_files_dir = "$BUILD_TMPDIR/CMakeFiles",
+         generate_crosstool_file = False,
++        generate_args = [],
+         **kwargs):
+     cache_entries.update({"CMAKE_BUILD_TYPE": "Bazel"})
+     cache_entries_debug = dict(cache_entries)
+@@ -131,7 +132,7 @@ def envoy_cmake(
+             "@envoy//bazel:dbg_build": cache_entries_debug,
+             "//conditions:default": cache_entries,
+         }),
+-        generate_args = ["-GNinja"],
++        generate_args = ["-GNinja"] + generate_args,
+         targets = ["", "install"],
+         # TODO: Remove install target and make this work
+         install = False,
+diff --git a/bazel/foreign_cc/BUILD b/bazel/foreign_cc/BUILD
+index 4d3a281669..b4716dfe2e 100644
+--- a/bazel/foreign_cc/BUILD
++++ b/bazel/foreign_cc/BUILD
+@@ -394,6 +394,12 @@ envoy_cmake(
+         "WAMR_BUILD_LIBC_WASI": "0",
+         "WAMR_BUILD_TAIL_CALL": "1",
+     },
++    generate_args = select({
++        "//conditions:default": [],
++        "@platforms//cpu:aarch64": [
++            "-DWAMR_BUILD_TARGET=AARCH64",
++        ],
++    }),
+     lib_source = "@com_github_wamr//:all",
+     out_static_libs = ["libvmlib.a"],
+     tags = ["skip_on_windows"],