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Re: if vs. ifdef in

From: ljh
Subject: Re: if vs. ifdef in
Date: Fri, 3 Mar 2023 18:13:45 +0800

ifdef is not wrong. 

In GCC, `-DFOO=1` means `-DFOO`

-D name
           Predefine name as a macro, with definition 1.

-D name=definition

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