为什么 GCC 似乎没有文件系统标准库? [英] Why does GCC not seem to have the filesystem standard library?

问题描述

我遇到了文件系统库的问题，它应该包含在 c++17 编译器中，2 天后我尝试在 raspberry pi 中安装 gcc-7.0.2 但它没有用，它不能识别命令 gcc-7 或 g++-7 甚至 -std=c++17 所以我不得不使用 apt-get install 安装 g++-6 和 gcc-6无论如何，在安装 6 版本后，编译器包含 c++17.我使用代码块作为 IDE，我不得不添加一个新的编译器并添加选项 -std=c++17 来启用它，但是在主代码中，当我包含文件系统库时，它说没有这样的文件或目录.

i'm facing a problem with filesystem library, it should be included in c++17 compiler, after 2 days i tried to install gcc-7.0.2 in raspberry pi but it didn't work, it couldn't recognize the command gcc-7 or g++-7 or even -std=c++17 so i had to install g++-6 and gcc-6 using apt-get install anyway, after installing the 6 version the compiler include c++17. i'm using codeblocks as IDE, i had to add a new compiler and add the option -std=c++17 to enable it,but in the main code when i include the filesystem library it says no such file or directory.

我的问题是，如何正确添加 c++17 编译器及其库(如文件系统)??

my question is, how i can add the c++17 compiler and its library (like filesystem) correctly ??

推荐答案

GCC v7 仍然没有实现 但它确实有文件系统技术规范，它位于

GCC v7 still does not implement <filesystem> but it does have the Filesystem Technical Specification which is in <experimental/filesystem>

#include <experimental/filesystem>

// for brevity
namespace fs = std::experimental::filesystem;

int main()
{
    fs::path p = "/path/to/my/file"; // etc...
}

这也适用于 GCC v6.

要与库链接，您需要将 -lstdc++fs 添加到命令行.

To link with the library you need to add -lstdc++fs to the command line.

注意:当前的技术规范与 由标准委员会决定.

Note: There may be some minor differences between the current Technical Specification and the final draft of <filesystem> that is decided upon by the Standards Committee.

注意 2: GCC v8 现在实现了 带有 -std=c++17 标志.

Note 2: GCC v8 now implements <filesystem> with the -std=c++17 flag.

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