Intermediate code from C++

Question

I want to compile a C++ program to an intermediate code. Then, I want to compile the intermediate code for the current processor with all of its resources.

The first step is to compile the C++ program with optimizations (-O2), run the linker and do most of the compilation procedure. This step must be independent of operating system and architecture.

The second step is to compile the result of the first step, without the original source code, for the operating system and processor of the current computer, with optimizations and special instructions of the processor (-march=native). The second step should be fast and with minimal software requirements.

Can I do it? How to do it?

Edit:
I want to do it, because I want to distribute a platform independent program that can use all resources of the processor, without the original source code, instead of distributing a compilation for each platform and operating system. It would be good if the second step be fast and easy.

Processors of the same architecture may have different features. X86 processors may have SSE1, SSE2 or others, and they can be 32 or 64 bit. If I compile for a generic X86, it will lack of SSE optimizations. After many years, processors will have new features, and the program will need to be compiled for new processors.