cpp: delay #include's until second pass

问题

I'm running my source file through the C preprocessor twice before compiling it, and I want to delay The #include directives until the second pass.

Intuitively, I tried this, but it doesn't work:

##include <zlib.h>

I just need a construct, that when preprocessed, will give #include mylib.

回答1:

You could define a macro, like

#define INCLUDE #include

and then when you include stuff, use the macro instead.

INCLUDE <zlib.h>

In GCC's preprocessor, at least, that gives me #include <zlib.h>.

来源：https://stackoverflow.com/questions/6379404/cpp-delay-includes-until-second-pass