Compilation issues when using #include<filesystem>

pingal

Thanks for the reply.

According to the link "Using this library may require additional compiler/linker options. GNU implementation prior to 9.1 requires linking with -lstdc++fs and LLVM implementation prior to LLVM 9.0 requires linking with -lc++fs"

So i added the following lines in .pro file

LIBS += -lstdc++fs

Still the same output.

P.S: I also tried

LIBS += -lc++fs

But the problem persists

JonB

@pingal
I do not know what precisely you are supposed to do here. But the errors you show earlier are compilation errors, so adding linker flags is not going to resolve that....

pingal

@JonB exactly, that's the compilation errors and has nothing to do with the linker but i followed notes Kent-Dorfman has suggested

I think this is some sort of bug (when std::filesystem is used in QT)

JonB

@pingal said in Compilation issues when using #include<filesystem>:

I think this is some sort of bug (when std::filesystem is used in QT)

Well you could test that in a standalone program without Qt?

I have seen possible issues like https://www.reddit.com/r/cpp_questions/comments/f10d31/comment/fh11qat/?utm_source=reddit&utm_medium=web2x&context=3

Your issue is most likely with MINGW. Its GCC may not be complete/up-to-date.

Maybe you could play at https://godbolt.org/ ?

Axel Spoerl

Your compiler version (mingw8.1.0) is not suitable for the Qt version you are trying to compile with (6.0.2).
See here for an overview.
More specifically: for the MinGW version you use, you have to #include<experimental/filesystem> which is why you get the error.
With more recent compilers (e.g. GCC10 or MinGW 11.2), -lstdc++fs is no longer necessary. If the missing linking instruction was the problem, you'd have had a linker rather than a compiler error.
BRgds
Axel

pingal

@Axel-Spoerl That really helped.

I've added QT 6.2.3 along with MinGW 9.0.0 to QT Creator and the problem is solved.

rowan Samy

@pingal how did you fix this bug I have the same issue

JonB

@rowan-Samy
Since @pingal already wrote

I've added QT 6.2.3 along with MinGW 9.0.0 to QT Creator and the problem is solved.

what have you done?

rowan Samy

This post is deleted!

rowan Samy

This post is deleted!

JonB

@rowan-Samy
Seriously?

Install Qt 6.2.3.
Install (may come with the Qt version) and use (select as kit) MinGW 9.0.0.
See whether your problem has gone away.

If not then it appears you have a different problem from @pingal so there's no point asking him what he did.