extern variable has an initializer 在C语言中,extern是用于在不同的代码文件中共享变量或函数的关键字。当在一个源代码文件中声明一个extern变量时,它将被认为是在另一个文件中定义的。而当在另一个文件中定义这个变量时,需要在前面加上extern关键字,以表明它已经在另一个文件中声明过了。 extern变量通常是全局变量,即
@文心快码BaiduComateerror: 'extern' variable has an initializer 文心快码BaiduComate 1. 什么是'extern'变量以及它的常规用法extern关键字在C和C++中用于声明一个变量或函数是在其他文件或同一文件的其他部分定义的。它的主要作用是告诉编译器该变量或函数是在其他地方定义的,因此编译器在链接阶段会去寻找其定义。
有可能是你调用外部变量时给变量赋值了，变量赋值应该在初始化定义的时候或者使用到变量的时候，外部引用的时候不要赋值。函数声明本身就不用extern，直接声明就行了，你这里的inlcude<stdio.h>include "a.c" //不应该这样做，includevoid msg(); //z这句就是声明，在调用别的文件里的函数时...
has initializer but incomplete type 刚开始还在想是不是编译器有问题。 因为电脑上的gcc4.8编没什么问题。 但是用了这么久的编译器,出问题的可能性太小了,后面猜测是编译器少配置了什么选项的原因 , 最终在 https://github.com/bitcoin/bitcoin/issues/... 查看原文 wifi 移植,将驱动放入内核编译ko文件,编译...
For example, if we have a variable x with an initial value of 0, then the statement x = 0 is redundant. In this case, the initializer is unnecessary because the variable already has a valid value. In other cases, a variable initializer may be necessary. This happens when the variable ...
eis a record literal where every component has an obvious type. *For instance,(1, enabled: true), but not(1, enabled: foo()). * eis a local variable that has not been promoted. *For instance,int i = 1;thenvar x = i;.
The analyzer has detected a variable that could be created in a lower level scope. By changing the scope of an object, you can optimize the code′s performance and memory consumption.
A local non-static variable of a non-class type has an undefined value before it is initialized. For example, it is incorrect to rely on an uninitialized integer to have the value 0.Recommendation Review the code and consider whether the variable should have an initializer or whether some ...
If you have not already acquired the resource before passing control to the Using block, the Using statement must acquire the resource. To do this, it must create an object from the specified class, which requires a New clause.Error ID: BC36011...
// Check that we get an error if we try to call a __device__ function from a // module initializer. struct S { // expected-note@-1 {{candidate constructor (the implicit copy constructor) not viable: requires 1 argument, but 0 were provided}} ...