Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it

[Richard Henderson]

On 03/15/2016 02:29 AM, Markus Armbruster wrote:
> Headers can
> be read multiple times, which can only hurt compilation time.  You need
> to make an effort to avoid cyclic dependencies and excessive inclusion.

I just want to point out that the preprocessor understands the

#ifndef FOO
#define FOO
...
#endif

idiom, where nothing but comments precedes the #ifndef in the file, and
likewise nothing succeeds the matching #endif.  If FOO is still defined at the
next #include of the file, the preprocessor will skip the #include entirely.

So don't let this be a consideration in the argument.


r~