sorry that we missed your question.
to create a DLL from cmdline:
icl /c /O2 /MD t1.cpp t2.cpp
xilink /DLL t1.obj t2.obj
icl /O2 /MD t1.cpp t2.cpp /link /DLL
the original build is within the IDE, it has the "/Qdiag-enable:sc-parallel3 /Qdiag-enable:sc-include", when the /Qdiag-enable:sc-parallel3 is on, the compiler will only do analysis, do not create .obj files. it's why there is no .dll
after you get the analysing result, make any necessary code change and build again. But to build the program for testing, you need toturn the option off and rebuild.