snapshot: preserve the uncommitted Canary instrumentation (not authored here)

Working-tree snapshot taken 2026-07-28 so this work is not lost. To be clear
about provenance: NONE of this was written in the session that committed it —
it is pre-existing uncommitted work on phase-a-tracing, last committed 2026-07-09,
from the xenia-rs decoder/deadlock investigation. It is recorded verbatim, not
reviewed and not tested.

Contents: 24 tracked modifications (ppc_emit_memory, xex_module, object_table,
shim_utils, xboxkrnl threading/rtl, xevent/xobject/xthread, memory) plus the
untracked probe sources audit_68_host_mem_watch, audit_69_event_signal_watch,
audit_70_semaphore_release_watch, phase_b_snapshot, and cmake/toolchains.

Deliberately excluded: build-cross/ (51 GB of build output) and
vkd3d-proton.cache. Note third_party/snappy is a submodule pointer change whose
target may not be pushed anywhere, so this branch is a preservation record rather
than a guaranteed-buildable tree.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

CMakeLists.txt

@@ -78,6 +78,20 @@ file(MAKE_DIRECTORY "${PROJECT_SOURCE_DIR}/scratch")
 # Python for shader compilation scripts
 find_package(Python3 REQUIRED COMPONENTS Interpreter)
 
+# Generate build-tree version.h via xenia-build.py's generate_version_h()
+# (normally invoked by `xb premake`/`xb build`; CMake-direct flows need it too).
+execute_process(
+  COMMAND ${Python3_EXECUTABLE} -c "import importlib.util,sys; spec=importlib.util.spec_from_file_location('xb',r'${PROJECT_SOURCE_DIR}/xenia-build.py'); m=importlib.util.module_from_spec(spec); spec.loader.exec_module(m); m.generate_version_h(r'${CMAKE_BINARY_DIR}')"
+  WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
+  RESULT_VARIABLE _xenia_version_rc
+)
+if(NOT _xenia_version_rc EQUAL 0)
+  message(WARNING "version.h generation failed (rc=${_xenia_version_rc}); writing stub.")
+  file(WRITE "${CMAKE_BINARY_DIR}/version.h"
+    "#ifndef GENERATED_VERSION_H_\n#define GENERATED_VERSION_H_\n#define XE_BUILD_BRANCH \"unknown\"\n#define XE_BUILD_COMMIT \"unknown\"\n#define XE_BUILD_COMMIT_SHORT \"unknown\"\n#define XE_BUILD_DATE __DATE__\n#endif\n"
+  )
+endif()
+
 # Include helpers
 include(cmake/XeniaHelpers.cmake)
 
@@ -142,8 +156,17 @@ if(MSVC)
 
   # --- Per-configuration MSVC flags ---
   # Checked
-  string(APPEND CMAKE_C_FLAGS_CHECKED " /RTCsu /fsanitize=address")
-  string(APPEND CMAKE_CXX_FLAGS_CHECKED " /RTCsu /fsanitize=address")
+  # /RTCsu is MSVC-only; clang-cl ignores it with a per-TU warning. Gate it
+  # so the Checked config stays quiet when cross-compiling with clang-cl.
+  # ASan (/fsanitize=address) stays active in both branches.
+  if(CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "MSVC"
+     AND NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    string(APPEND CMAKE_C_FLAGS_CHECKED " /RTCsu /fsanitize=address")
+    string(APPEND CMAKE_CXX_FLAGS_CHECKED " /RTCsu /fsanitize=address")
+  else()
+    string(APPEND CMAKE_C_FLAGS_CHECKED " /fsanitize=address")
+    string(APPEND CMAKE_CXX_FLAGS_CHECKED " /fsanitize=address")
+  endif()
   string(APPEND CMAKE_EXE_LINKER_FLAGS_CHECKED " /INCREMENTAL:NO")
   add_compile_definitions($<$<CONFIG:Checked>:DEBUG>)