I’d like to be able to compile a C/C++ library so that it runs within a safe managed runtime in the Silverlight CLR.
There are several tools for doing this with the JVM that allows C++ code to run within a CRT emulation layer (see NestedVM, LLJVM, etc), which effectively allows C++ code to be run within a Java Applet. There’s even a tool for this for the Adobe Flash VM (see Alchemy).
However, I can’t seem to find any tools like this for the CLR. fyi, the MSVC tools don’t seem to allow for this: The /clr:pure flag will create C++ code that runs in the CLR, but it isn’t safe (because the CRT isn’t safe) and /clr:safe requires massive code changes (no native types, etc).
Then I think you are plain out of luck. If your code can’t use the /clr:safe flag then it won’t be compilable into something that can run in Silverlight. If the C++ is doing something that the CLR does not allow or support, then there is no way around this directly.
Depending what your code does, you could possibly execute it on the server and call that from Silverlight via a web service?