确定preprocessor优化级别？ [英] Determine optimization level in preprocessor?

问题描述

-oG 是旨在改善调试体验，同时进行优化一个较新的优化选项。如果用户选择了 -oG ，那么我想我的源文件来激活备用code路径来增强调试体验。 GCC提供 __ __ OPTIMIZE preprocessor宏观，但它只有在优化实际上是设置为1。

-Og is a relatively new optimization option that is intended to improve the debugging experience while apply optimizations. If a user selects -Og, then I'd like my source files to activate alternate code paths to enhance the debugging experience. GCC offers the __OPTIMIZE__ preprocessor macro, but its only set to 1 when optimizations are in effect.

有没有学习的优化级别，如 -O1 ， -O3 或<$ C $方式C> -oG ，用于与preprocessor用？

Is there a way to learn the optimization level, like -O1, -O3 or -Og, for use with the preprocessor?

推荐答案

我相信这是不可能直接知道用来编译软件的优化级别，因为这不是的定义preprocessor符号列表

I believe this is not possible to know directly the optimization level used to compile the software as this is not in the list of defined preprocessor symbols

您可以依靠 -DNDEBUG （没有调试），这是用来关闭在发布code断言和启用调试code路径这种情况下。

You could rely on -DNDEBUG (no debug) which is used to disable assertions in release code and enable your "debug" code path in this case.

不过，我相信美好的事情是有一个全系统的集本地项目符号，让用户选择要明确使用什么：

However, I believe a better thing to do is having a system wide set of symbols local to your project and let the user choose what to use explicitly.:

• MYPROJECT_DNDEBUG


• MYPROJECT_OPTIMIZE


• MYPROJECT_OPTIMIZE_AGGRESSIVELY

• MYPROJECT_DNDEBUG
• MYPROJECT_OPTIMIZE
• MYPROJECT_OPTIMIZE_AGGRESSIVELY

此使调试或释放/更易于调试之间行为的差异可以逐步打开/关闭的不同的行为。

This makes debugging or the differences of behavior between release/debug much easier as you can incrementally turn on/off the different behaviors.

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