Reading source code (2)

Many codes have Conditional compilation options. We really want to know what the code based on a certain condition looks like, instead of being affected by irrelevant code.

There is a good command, which is the preprocessing option of gcc.

You only need to perform the following operations on the source code:

Gcc-E source. c-o source. I

The obtained source. I file is a pre-processed file, and my friends and I are stunned.

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