三字符?? /忽略，使用-trigraphs启用 [英] trigraph ??/ ignored, use -trigraphs to enable

问题描述

我的编译器（GCC）是给我这个警告。请帮我理解这意味着什么：

  

警告：三字符?? /忽略，使用-trigraphs启用

解决方案

您已经意外写的的三字母某处源$ C ​​$ C（编译器的警告，将查明线）。由于三字母被发明来解决，不进入现代系统发挥出了问题，你实际上并不希望三字母 ?? / 与字符替换 \\ 。

因此​​，这个警告可能应该被忽略（你可以告诉编译器中加入 -Wno-三字母在 -Wall 在命令行中，看到文档）。但它会是很好的展现你的源$ C ​​$ C，所以我们可以肯定的。

My compiler (gcc) is giving me this warning. Please help me to understand what it means:

warning: trigraph ??/ ignored, use -trigraphs to enable

解决方案

You have "accidentally" written a trigraph somewhere in your source code (the compiler's warning would pinpoint the line). Since trigraphs were invented to solve a problem that doesn't come into play on modern systems, you don't actually want the trigraph ??/ to be replaced with the character \.

Therefore, this warning should probably be ignored (you can tell the compiler to shut up by adding -Wno-trigraphs after -Wall in your command line; see the docs). But it would be good to show your source code so we can be sure.

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