Link Standard Headers to GCC

[lyric yacht]

I am having this issue when running CMake in a Docker container:

10.60 CMake Error at /build/_deps/drogon-src/CMakeLists.txt:158 (message):
10.60   Not found std::filesystem, please use a newer compiler

Docker command: docker build . --platform linux/arm/v8

From the CMakeLists.txt on Drogon (https://github.com/drogonframework/drogon/blob/master/CMakeLists.txt#L158), it's caused by CXX_FILESYSTEM_HAVE_FS not being set. This flag is only set when CMake finds the filesystem header (see attached image).

Seems like it's an issue with g++ not seeing the header files:

#25 8.300 -- Looking for C++ include any
#25 8.466 -- Looking for C++ include any - not found
#25 8.467 -- Looking for C++ include string_view
#25 8.632 -- Looking for C++ include string_view - not found
#25 8.632 -- Looking for C++ include coroutine
#25 8.798 -- Looking for C++ include coroutine - not found

I checked and confirmed that all headers are in the /usr/include/c++/12 directory.

Versioning:
Base image: Debian - Bookworm
Cmake: 3.30.4
G++: g++ (Debian 12.2.0-14) 12.2.0
Installed: apt-get install libstdc++-12-dev gcc build-essential libtool wget libssl-dev pkg-config uuid-dev git

Seems like this issue is a Cmake/g++ linking to headers but if it's a Docker issue then I can transfer the question to another server.

[slender raptor]

When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question use !howto ask.

[exotic lion]

oh its debian, welcome to 2014

well normally this should all work perfectly by getting cmake, g++, and libstdc++, even on debian. its probably a docker issue

[lyric yacht]

Well it's mostly to reduce size of container, will try with Ubuntu

Hm alright will check Docker forums about this too then

[vast oasis]

Doubt it's distro specific

What does g++ --version give

[lyric yacht]

g++ --version: g++ (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0

[lyric yacht]

Yeah Ubuntu doesn't help

[lyric yacht]

Follow up:
Seems like this is failing: https://github.com/drogonframework/drogon/blob/152a69f1e96c610f8490376b515b9ee029f2cfca/CMakeLists.txt#L158
Which can be traced back to here: https://github.com/drogonframework/drogon/blob/152a69f1e96c610f8490376b515b9ee029f2cfca/cmake_modules/FindFilesystem.cmake#L194
And then to the source of the issue (I think): https://github.com/drogonframework/drogon/blob/152a69f1e96c610f8490376b515b9ee029f2cfca/cmake_modules/FindFilesystem.cmake#L162

So my question how can I link the headers to Cmake as CHECK_INCLUDE_FILE_CXX() doesn't seem to find filesystem?

[vast oasis]

It's gcc 11 not 12
Check if it has that header

[lyric yacht]

It was 12 on Debian I just reran it on Ubuntu and that one's 11

[lyric yacht]

Alright checking

[vast oasis]

Try updating them to 14
gcc12 should have <filesystem> tho

[lyric yacht]

Turns out it was a toolchain issue, still not sure where exactly the problem was though