How to obtain the intermediate files (i.e. I.files) for any C/C++ compilers?

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C++

C

I am working on code defect testing.The routine goes as follows: I receive source codes to be tested from the client, and then pre-process/treatment source codes to produce the intermediate files(that is .i files) using the compiler in my machine instead of the compiler the client uses. The problem arises because the intermediate files I obtain is not eligible to be analyzed further. For example, some particular macros cannot be recognized by the compiler installed on my machine. I surmise that the configuration of compiler is dependent on the development environment, as you know, many codes are programmed in an IDE. As a consequence, when I attempt to transplant the original source code onto my machine, some configurations of compiler are missing or wrong. All that said, what I want to achieve is to obtain the intermediate files generated under the client's development environment. It's required that the solution should be simple as possible because I don't want to put too much burden on clients. Any help would be appreciated.

What I have tried:

I have not figured out any solution yet.