Implement fbs schema & json to fbs converter tool

.bazelrc

@@ -104,6 +104,10 @@ common:qnx_arm64 --test_env=QEMU_CPU=Cascadelake-Server-v5
 
 common:qnx --config=qnx_x86_64
 
+# Enables FlatBuffers-based mw::com configuration tooling (disabled by default,
+# see score/mw/com/impl/configuration/flatbuffers_flags.bzl).
+common:flatbuffers --//score/mw/com/impl/configuration:enable_flatbuffers=true
+
 # unshare /dev/shm and /tmp
 test --sandbox_tmpfs_path=/dev/shm
 test --sandbox_tmpfs_path=/tmp

MODULE.bazel

@@ -17,6 +17,7 @@ bazel_dep(name = "bazel_skylib", version = "1.9.0")
 bazel_dep(name = "boost.interprocess", version = "1.83.0.bcr.4")
 bazel_dep(name = "boost.program_options", version = "1.83.0.bcr.4")
 bazel_dep(name = "download_utils", version = "1.2.2")
+bazel_dep(name = "flatbuffers", version = "25.12.19")
 bazel_dep(name = "googletest", version = "1.17.0.bcr.2")
 bazel_dep(name = "nlohmann_json", version = "3.11.3")
 bazel_dep(name = "platforms", version = "1.0.0")

quality/visibility_guard/public_targets.golden

@@ -87,6 +87,8 @@
 //score/mw/com/dependability:mw_com_rst
 //score/mw/com/example/com-api-example:com-api-example
 //score/mw/com/impl/bindings/mock_binding:generic_skeleton_event
+//score/mw/com/impl/configuration/converter:json_to_flatbuffer
+//score/mw/com/impl/configuration/converter:mw_com_config.bin
 //score/mw/com/impl/configuration:mw_com_config.json
 //score/mw/com/impl/configuration:mw_com_config_disabled_trace_config.json
 //score/mw/com/impl/configuration:mw_com_config_invalid_trace_config_path.json

score/mw/com/impl/configuration/BUILD

@@ -11,10 +11,12 @@
 # SPDX-License-Identifier: Apache-2.0
 # *******************************************************************************
 
+load("@flatbuffers//:build_defs.bzl", "flatbuffer_cc_library")
 load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
 load("//bazel/tools:json_schema_validator.bzl", "validate_json_schema_test")
 load("//quality/unit_testing:unit_testing.bzl", "cc_unit_test")
 load("//score/mw:common_features.bzl", "COMPILER_WARNING_FEATURES")
+load(":flatbuffers_flags.bzl", "FLATBUFFERS_TARGET_COMPATIBLE_WITH", "flatbuffers_build_settings")
 
 validate_json_schema_test(
     name = "validate_mw_com_config_schema",
@@ -24,6 +26,34 @@ validate_json_schema_test(
     target_compatible_with = ["@platforms//os:linux"],
 )
 
+# Feature flag gating availability of FlatBuffers-based configuration tooling.
+# Disabled by default; enable with:
+#   bazel build --config=flatbuffers //...
+flatbuffers_build_settings(
+    visibility = ["//score/mw/com/impl/configuration:__subpackages__"],
+)
+
+# FlatBuffers schema mirroring mw_com_config_schema.json. Compiling it in-build
+# validates the schema and provides the generated C++ header (mw_com_config_generated.h)
+# to consumers that read the binary configuration produced by the converter tool
+# (//score/mw/com/impl/configuration/converter:json_to_flatbuffer).
+flatbuffer_cc_library(
+    name = "mw_com_config_fbs",
+    srcs = ["mw_com_config.fbs"],
+    target_compatible_with = FLATBUFFERS_TARGET_COMPATIBLE_WITH,
+    visibility = ["//score/mw/com:__subpackages__"],
+)
+
+# Exported so the converter tool package can reference the schema (as the flatc
+# input) and the example config (in its rule/test).
+exports_files(
+    [
+        "mw_com_config.fbs",
+        "example/mw_com_config.json",
+    ],
+    visibility = ["//score/mw/com/impl/configuration/converter:__pkg__"],
+)
+
 filegroup(
     name = "mw_com_config_schema",
     srcs = ["mw_com_config_schema.json"],

score/mw/com/impl/configuration/converter/BUILD

@@ -0,0 +1,59 @@
+# *******************************************************************************
+# Copyright (c) 2026 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+
+load("@rules_python//python:defs.bzl", "py_binary", "py_test")
+load("//score/mw/com/impl/configuration:flatbuffers_flags.bzl", "FLATBUFFERS_TARGET_COMPATIBLE_WITH")
+load(":json_to_flatbuffer_rule.bzl", "mw_com_config_to_flatbuffer")
+
+py_binary(
+    name = "json_to_flatbuffer",
+    srcs = [
+        "json_to_flatbuffer.py",
+    ],
+    imports = ["."],
+    main = "json_to_flatbuffer.py",
+    visibility = ["//visibility:public"],
+)
+
+# Requires FlatBuffers support (see //score/mw/com/impl/configuration:flatbuffers_flags.bzl):
+#   bazel test --config=flatbuffers :json_to_flatbuffer_test
+py_test(
+    name = "json_to_flatbuffer_test",
+    size = "small",
+    srcs = [
+        "json_to_flatbuffer.py",
+        "json_to_flatbuffer_test.py",
+    ],
+    data = [
+        "//score/mw/com/impl/configuration:example/mw_com_config.json",
+        "//score/mw/com/impl/configuration:mw_com_config.fbs",
+        "@flatbuffers//:flatc",
+    ],
+    env = {
+        "FLATC_PATH": "$(rootpath @flatbuffers//:flatc)",
+    },
+    imports = ["."],
+    main = "json_to_flatbuffer_test.py",
+    target_compatible_with = FLATBUFFERS_TARGET_COMPATIBLE_WITH,
+)
+
+# Example: build the FlatBuffer binary for the example configuration as part of
+# the build graph. Requires FlatBuffers support to be enabled:
+#   bazel build --config=flatbuffers //score/mw/com/impl/configuration/converter:mw_com_config.bin
+mw_com_config_to_flatbuffer(
+    name = "mw_com_config.bin",
+    out = "mw_com_config.bin",
+    config_json = "//score/mw/com/impl/configuration:example/mw_com_config.json",
+    target_compatible_with = FLATBUFFERS_TARGET_COMPATIBLE_WITH,
+    visibility = ["//visibility:public"],
+)