Added ARM32 support

source/HotReload/CMakeLists.txt

@@ -5,6 +5,16 @@
 # independent of the project-wide BUILD_SHARED_LIBS default.
 add_lib_module(hotreload_lib TYPE STATIC OUTPUT_NAME "hotreload")
 
+# hot_reload::Context (Context.cpp) uses std::shared_mutex internally for its thread-safety
+# guarantee (see Context.hpp's own doc comment), and the MSVC branch of Demangle.cpp uses
+# std::mutex to serialize calls into DbgHelp. Both need pthread linked explicitly on Linux with
+# glibc older than 2.34 (newer glibc merged libpthread into libc itself, making this a no-op
+# there rather than a requirement) -- Threads::Threads is CMake's own portable way to ask for
+# whatever that platform actually needs. PUBLIC for the same reason as CMAKE_DL_LIBS below: for a
+# STATIC library this needs to reach whatever executable ultimately links hotreload_lib.
+find_package(Threads REQUIRED)
+target_link_libraries(hotreload_lib PUBLIC Threads::Threads)
+
 if(NOT WIN32)
 	# dlopen/dlclose/dlinfo (ModuleHandle.cpp). PUBLIC, not PRIVATE:
 	# for a STATIC library this needs to reach whatever executable
@@ -13,14 +23,25 @@ if(NOT WIN32)
 	target_link_libraries(hotreload_lib PUBLIC ${CMAKE_DL_LIBS})
 endif()
 
-if(MSVC)
+# Two different questions, easy to conflate: "does this compiler take
+# MSVC-style command-line syntax" (the MSVC variable: real cl.exe and
+# clang-cl only) versus "does it produce MSVC-ABI output -- MSVC name
+# mangling, the Microsoft CRT, DbgHelp as its demangler" (also true of a
+# GNU-style clang++ pointed at the MSVC target, which is what a plain
+# Windows LLVM install gives you: no /W4-style flags, but still MSVC
+# mangling). This condition is the second question, and CMake derives
+# CMAKE_CXX_SIMULATE_ID from whether the compiler defines _MSC_VER --
+# the very macro Demangle.cpp's own #if keys on, so the two stay in
+# agreement by construction rather than by someone remembering to update
+# both. (cmake/BuildHelpers.cmake's /W4 and the root CMakeLists.txt's
+# /MP /EHsc are the first question, correctly keyed on MSVC alone.)
+if(MSVC OR CMAKE_CXX_SIMULATE_ID STREQUAL "MSVC")
 	# UnDecorateSymbolName (Demangle.cpp) lives in dbghelp.lib, which --
 	# unlike kernel32/user32 -- MSVC does not link by default. Without
 	# this, the final link fails with an undefined symbol for it;
 	# found via an actual Windows build of this library, not just
 	# documentation. PUBLIC for the same reason as CMAKE_DL_LIBS above.
-	# Guarded on MSVC (true for both real cl.exe and clang-cl, and
-	# false for MinGW) rather than WIN32, since MinGW's build of
+	# Guarded on the MSVC ABI rather than WIN32, since MinGW's build of
 	# Demangle.cpp takes the __GNUC__/__cxa_demangle branch instead and
 	# never needs dbghelp at all.
 	target_link_libraries(hotreload_lib PUBLIC dbghelp)