Disable shorten 64 to 32 error for arm64 (do not make it fatal) (#23237)

* Disable shorten 64 to 32 error for arm64 (do not make it fatal)

* Add a CI target that would catch these errors in future updates

* Restyle

* Fix typo and link to the pigweed update PR

.github/workflows/examples-linux-arm.yaml

@@ -73,6 +73,7 @@ jobs:
                         --target linux-arm64-chip-tool-ipv6only-clang \
                         --target linux-arm64-lock-clang \
                         --target linux-arm64-minmdns-clang \
+                        --target linux-arm64-light-rpc-ipv6only-clang \
                         --target linux-arm64-thermostat-no-ble-clang \
                         build \
                      "

build/config/compiler/BUILD.gn

@@ -259,6 +259,15 @@ config("strict_warnings") {
       "-Wshorten-64-to-32",
       "-Wformat-type-confusion",
     ]
+
+    # TODO: can make this back fatal in once pigweed updates can be taken again.
+    #       See https://github.com/project-chip/connectedhomeip/pull/22079
+    #
+    # Currently `./scripts/build/build_examples.py --target linux-arm64-light-rpc-ipv6only-clang build`
+    # fails in third_party/pigweed/repo/pw_protobuf
+    if (current_cpu == "arm64" && current_os == "linux") {
+      cflags += [ "-Wno-error=shorten-64-to-32" ]
+    }
   }
 
   if (!is_asan && (current_os == "linux" || current_os == "android")) {