Default to the rtlvirtualunwind back-end on arm

Author: jeremy-rifkin

cmake/Autoconfig.cmake

@@ -105,7 +105,10 @@ if(
       message(FATAL_ERROR "Cpptrace auto config: No unwinding back-end seems to be supported, stack tracing will not work. To compile anyway set CPPTRACE_UNWIND_WITH_NOTHING.")
     endif()
   elseif(MINGW OR WIN32)
-    if(HAS_STACKWALK)
+    if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(ARM64|AARCH64|aarch64)$")
+      set(CPPTRACE_UNWIND_WITH_RTLVIRTUALUNWIND On)
+      message(STATUS "Cpptrace auto config: Using RtlVirtualUnwind for unwinding")
+    elseif(HAS_STACKWALK)
       set(CPPTRACE_UNWIND_WITH_DBGHELP On)
       message(STATUS "Cpptrace auto config: Using dbghelp for unwinding")
     else()