What

Enable LOGGER_USE_THREAD_SYSTEM=ON in vcpkg build mode so that logger_system
can use thread_system's thread pool executor instead of falling back to the
standalone std::jthread-based executor.

Currently the vcpkg portfile forces -DLOGGER_USE_THREAD_SYSTEM=OFF as a
workaround for unresolved externals when linking thread_pool symbols.

Why

When LOGGER_USE_THREAD_SYSTEM=OFF, logger_system falls back to its standalone
async executor. This means:

• Users who install both kcenon-logger-system and kcenon-thread-system via
  vcpkg cannot benefit from thread_system's optimized thread pool (work stealing,
  lock-free queues) for log dispatch.
• The monitoring_system and network_system portfiles that depend on both
  logger_system and thread_system cannot achieve unified thread management.

The root cause is a CMake export/config issue, not an architectural problem:

1. logger_system-config.cmake.in uses find_dependency(thread_system QUIET) —
   silent failure masks missing dependency.
2. Transitive dependency propagation in the export set may be incomplete when
   thread_system sub-targets (e.g., thread_base) are not fully declared.

Where

• CMakeLists.txt — lines 408–450 (thread_system linking logic)
• cmake/logger_system-config.cmake.in — lines 20–31 (find_dependency calls)
• vcpkg portfile: vcpkg-registry/ports/kcenon-logger-system/portfile.cmake line 23

How

Acceptance Criteria

• vcpkg build with -DLOGGER_USE_THREAD_SYSTEM=ON succeeds on all CI platforms
• Consumer project can find_package(logger_system) and link without unresolved symbols
• LOGGER_HAS_THREAD_SYSTEM compile definition is propagated to consumers
• Fallback to standalone executor still works when thread_system is not available

Technical Approach

1. Fix logger_system-config.cmake.in: Change find_dependency(thread_system QUIET)
   to find_dependency(thread_system CONFIG REQUIRED) when LoggerSystem_USE_THREAD_SYSTEM
   is ON, ensuring transitive dependencies are resolved at consume-time.

2. Verify export set: Ensure install(TARGETS ... EXPORT logger_system-targets) properly
   includes the PUBLIC dependency on thread_system when it is an IMPORTED target.

3. Update portfile: Remove -DLOGGER_USE_THREAD_SYSTEM=OFF override and add
   kcenon-thread-system as a required dependency in the port's vcpkg.json.

4. CI verification: Add a consumer integration test that links both logger_system and
   thread_system and calls logger APIs.

Related

• vcpkg portfile workaround: vcpkg-registry/ports/kcenon-logger-system/portfile.cmake:12-23
• thread_system config: thread_system/cmake/thread_system-config.cmake.in
• Previous bidirectional dependency resolution: CMakeLists.txt:209-221