WIP: Allow disabling exception trace info via --DRT-traceContext=off

src/ldc/eh/config.d

@@ -0,0 +1,11 @@
+module ldc.eh.config;
+
+import rt.config;
+
+package __gshared bool traceContext = true;
+
+shared static this()
+{
+ if (rt_configOption("traceContext") == "off")
+ traceContext = false;
+}

src/ldc/eh/libunwind.d

@@ -491,7 +491,8 @@ void _d_throw_exception(Object e)
 
  auto throwable = cast(Throwable) e;
 
- if (throwable.info is null && cast(byte*)throwable !is typeid(throwable).init.ptr)
+ static import ldc.eh.config;
+ if (ldc.eh.config.traceContext && throwable.info is null && cast(byte*)throwable !is typeid(throwable).init.ptr)
  throwable.info = _d_traceContext();
 
  auto exc_struct = ExceptionStructPool.malloc();