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What makes..._attributenoreturn_) in sy

K
Kadyn last edited by
I found an expression in Linux API.
```
#define NORETURN __attribute__((__noreturn__))
```
Can someone explain how this works?
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J
Jolied last edited by

There are some functions where the programme is no longer returning. Like abort or longjump. Such functions are usually marked with similar attributes so that the compiler (as well as the code analysers) know about this particularity and do not ask questions, and may write a little more optimum/right code.
And your define is a common practice, the fact is that most of these attributes depend heavily on the compiler. And whatever it takes to write a bunch of #ifdef, it's like athributums, and it's a collection system (or one hedge) that makes the right values for the chosen compiler/media.
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N1256 6.2.1/7Any other identifier has scope that begins just after the completion of its declarator.I mean, the visibility area of the variable's name begins immediately after declarator♪ In your case, in the initialling, the name is already visible and can be used. It means you can initiate the variable by yourself, and it will therefore have an indeterminate value.By the way, C++ has the same rule, which means that it is possible to replicate an uninitiated object:Some s1 = s1; std::string s1 = s2; If (and generally) the copy design does not process any self-copying, the facility after such initialization will be in an uncertain state.
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What makes..._attribute______noreturn_______) in sy

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