For those processors that have an explicit compile phase, use-when filtering is intended to avoid compiling blocks of code that the processor couldn't execute.
对于那些具有明确编译阶段的处理程序，use -when筛选通常可以避免编译那些处理程序不能执行的代码块。
For instance, if the attempt to compile a program fails due to unresolved symbols, it's possible that an earlier phase of the build process did something wrong!
举例来说，如果试图编译程序时由于存在无法解析的符号而失败了，那么就可能是编译过程前面某个步骤出现了问题！
For instance, if the attempt to compile a program fails due to unresolved symbols, it's possible that an earlier phase of the build process did something wrong!
举例来说，如果试图编译程序时由于存在无法解析的符号而失败了，那么就可能是编译过程前面某个步骤出现了问题！
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