Generating and saving code from Macro

Question

I am analyzing a legacy code which heavily using macro, I am lost in understanding how macro are expanding in code.

Could any one suggest me some tool or technique so that I can study actual code generated from macro expansion.

Platform : Windows XP
Language : C++
Compiler : VC6

Answer 1

To run the GCC as a pre-processor only do:

gcc -E source-file.cc > processed-source-file.cc

It also do all the #includes that you may or may not want.

Answer 2

With visual studio you can use the Generate Preprocessed File option.

In the properties for your project select

C/C++/Preprocessor/

In that tab there is an option to:

generate a preprocessed file.  

Select Yes, with numbers.

Answer 3

在源文件上运行预处理器（cpp）。

Answer 4

Since you're using Visual C this doesn't help you, but it might be helpful to others to mention:

Netbeans 6.7 is able to display the macro expanded version of C/C++ code in a separate window during editing.