How to fix "fatal error: filesystem: No such file or directory" in Code::Blocks?

Question

I'm writing a script which deletes old backup files. I've included filesystem as I would normally do, but this time, I got this error:

fatal error: filesystem: No such file or directory

I tried to include experimental/filesystem and I set -lstdc++fs as GCC flag. Nothing has worked for me.

Example code:

#include <cstdlib>
#include <algorithm>
#include <vector>
#include <filesystem>

namespace fs = std::filesystem;

int main()
{
    fs::path const directory{ "C:\Test" };
    std::vector<fs::directory_entry>::size_type const num_files_to_keep{ 5 };
    ...

The `std::filesystem` namespace was introduced in C++17. Does your version of GCC (I assume, considering your talk about `-lstdc++fs`) support C++17? Do you need to add the `-std=c++17` flag explicitly? — Some programmer dude, Jul 11 '19 at 11:04
I'm on GCC version 8.2.0. So there shouldn't be a problem. I've added "-std=c++17". Still failing to build. — Maximilian Choubert, Jul 11 '19 at 11:09
OT: `fs::path const directory{ "C:\Test" };` You need to escape your \ or use / — drescherjm, Jul 11 '19 at 12:09

Sergio · Answer 1 · 2019-07-12T22:37:12.967

Using CodeBlocks ang GCC 8.0 or above You need to set c++17 compiler option (I'm using CodeBlock last Nightly build).

Then you must add to the Linker settings options the stdc++fs library.

And then you must add the #include <filesystem> directive, from GCC 8.0, and not <experimental/filesystem>
On windows the directory separator is \\ (two backslash).
You need to write:

fs::path const directory { "C:\\Test" };

How to fix "fatal error: filesystem: No such file or directory" in Code::Blocks?

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