C++ 根据 Visual Studio 中的调试/发布配置自动#defines
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Automatic #defines according to Debug/Release config in Visual Studio
提问by Felix Dombek
I have debug output in my program like this:
我的程序中有这样的调试输出：
#define DEBUG
...
#ifdef DEBUG
std::cout << "[RE_words] " << m_re << std::endl;
#endif
and DEBUGis defined in my program manually. I always comment out the line when I make a release version. In Visual Studio, there are also Configurations for Debugvs Releaseversions which handle the commandline etc. used for compiling. Can I also use the Configuration "Debug" to automatically define DEBUGto the compiler? How?
并DEBUG在我的程序中手动定义。当我制作发布版本时，我总是注释掉这一行。在 Visual Studio 中，还有用于Debug和Release版本的配置，用于处理用于编译的命令行等。我还可以使用配置“调试”来自动定义DEBUG给编译器吗？如何？
回答by Jan Holecek
The Visual Studio automatically defines _DEBUG symbol for Debug builds (and NDEBUG for non-debug builds).
Visual Studio 会自动为调试版本定义 _DEBUG 符号（以及为非调试版本定义 NDEBUG）。
Another way to do this is to go to the project settings -> configuration properties -> C/C++ -> preprocessor, and edit the preprocessor definitions manually.
另一种方法是转到项目设置 -> 配置属性 -> C/C++ -> 预处理器，并手动编辑预处理器定义。
See also:
This answerexplains the differences between _DEBUG and NDEBUG in more detail.
This answerexplains the purpose of the NDEBUG symbol and whether or not is it defined by the standard.
另请参阅：
此答案更详细地解释了 _DEBUG 和 NDEBUG 之间的区别。
这个答案解释了 NDEBUG 符号的用途以及它是否由标准定义。
回答by Moo-Juice
Use _DEBUG. Visual C++ defines this for a Debug configuration. Check out the preprocessor directives for the Debug Configuration in your project's properties dialog.
使用_DEBUG. Visual C++ 为调试配置定义了它。在项目的属性对话框中查看调试配置的预处理器指令。
回答by Quijote
I too thought I just had to look at the preprocessor property and remove _DEBUG. Visual Studio tries to help out by setting _DEBUG if you select one of the debug run-time library options.
我也认为我只需要查看预处理器属性并删除 _DEBUG。如果您选择调试运行时库选项之一，Visual Studio 会尝试通过设置 _DEBUG 来提供帮助。
On the project property page Configuration Properties\C/C++\Code Generationthe option selected for Runtime Libraryaffects several defines. When selecting a debug library (/MTdor /MDd) the _DEBUGdefine isset.
在项目属性页Configuration Properties\C/C++\Code Generation 上，为Runtime Library选择的选项会影响多个定义。选择调试库（/MTd或/MDd）时，会设置_DEBUG定义。
See MSDN /MD, /MT ...for more info on the switches. There are several #defines that are set based on these options. They are pretty invisible when trying to find who sets a #define before you even include any header files!!
有关 开关的更多信息，请参阅MSDN /MD、/MT ...。有几个#defines 是基于这些选项设置的。在您甚至在包含任何头文件之前尝试查找谁设置了#define 时，它们是非常不可见的！！
回答by Nickolay Olshevsky
Yes, you should check project options page, Compile->Advanced compile options. However, VS by default automatically defines DEBUG directive for Debug mode.
是的，您应该检查项目选项页面，Compile->Advanced compile options。但是，VS 默认情况下会自动为 Debug 模式定义 DEBUG 指令。
