Fix MSVC compiler errors

CMakeLists.txt

@@ -73,6 +73,17 @@ else()
   FetchContent_Declare(antlr4 ${_antlr_fetch_args})
   FetchContent_MakeAvailable(antlr4)
 
+  # The runtime forgets some standard #includes (<chrono> for one), which newer
+  # standard libraries, notably Visual C++'s, no longer paper over. Supply them.
+  if(TARGET antlr4_static)
+    set(_compat "${CMAKE_CURRENT_SOURCE_DIR}/cmake/antlr_runtime_compat.h")
+    if(MSVC)
+      target_compile_options(antlr4_static PRIVATE "/FI${_compat}")
+    else()
+      target_compile_options(antlr4_static PRIVATE -include "${_compat}")
+    endif()
+  endif()
+
   set(ANTLRLAB_RUNTIME_LIBS antlr4_static)
   set(ANTLRLAB_RUNTIME_INCLUDES "${antlr4_SOURCE_DIR}/runtime/Cpp/runtime/src")
   set(ANTLRLAB_RUNTIME_DEFS ANTLR4CPP_STATIC)

cmake/antlr_runtime_compat.h

@@ -0,0 +1,38 @@
+// Force-included into the ANTLR C++ runtime's own build (see CMakeLists.txt).
+//
+// ANTLR 4.13's sources use some standard library facilities (std::chrono in
+// ProfilingATNSimulator.cpp, for one) without including the header that
+// declares them. That only worked because older standard libraries included
+// those headers indirectly; newer Visual C++ versions no longer do, and the
+// build fails with errors like "'high_resolution_clock': is not a class or
+// namespace name". Including them up front is harmless everywhere else.
+#pragma once
+
+#include <cstdio>
+
+#include <algorithm>
+#include <atomic>
+#include <chrono>
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <exception>
+#include <functional>
+#include <iostream>
+#include <iterator>
+#include <limits>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <numeric>
+#include <set>
+#include <sstream>
+#include <stdexcept>
+#include <string>
+#include <thread>
+#include <typeinfo>
+#include <unordered_map>
+#include <unordered_set>
+#include <utility>
+#include <vector>