GCC允许使用可变长度初始化数组 [英] GCC allowing arrays to be initialized with variable length

问题描述

GCC编译以下功能

void f(int i)
{
    int a[i];
}

我的印象是，您只能初始化具有固定长度的数组.应该编译吗，并且可以按照我的期望做吗?

I was under the impression that you can only initialize arrays with constant length. Is this supposed to compile, and will it do what I expect it to?

推荐答案

C99添加了可变长度数组.然后gcc将此扩展名添加到c89中，作为带有-std=gnu89选项的扩展名(默认值为gcc).

C99 added variable length arrays. And gcc adds this to c89 as an extension with -std=gnu89 option (the default with gcc).

在最新的C标准C11中，可变长度数组支持被标记为可选.

In the latest C Standard, C11, variable length arrays support is marked as optional.

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