merged with develop
I will review this weekend

@metivett this fails https://buildkite.com/feelpp/feelpp/builds/4323#283f4c92-8da0-4c22-9f1f-24a64793afbc/6-11239
I will check the dependencies asap
there is no one-to-one correspondence between boost::filesystem and std::filesystem so it may not be just switching boost:: to std::

@metivett this fails https://buildkite.com/feelpp/feelpp/builds/4323#283f4c92-8da0-4c22-9f1f-24a64793afbc/6-11239 I will check the dependencies asap there is no one-to-one correspondence between boost::filesystem and std::filesystem so it may not be just switching boost:: to std::

Indeed, that's why I had to adapt a few things in caeed9d.
However, I don't understand why we have the error: no namespace named 'filesystem' in namespace 'std' in buildkite, there should be such a namespace...

@metivett it is probably a problem with the GCC version. We use clang but clang uses libstdc++ and I think that std::filesystem is available only in GCC9.
I have to check the dependency version on GCC

@metivett I just checked and we use GCC 9. Also std::filesystem is properly defined for c++17 in GCC9
see eg /usr/include/c++/9/bits/fs_fwd.h
I will have a closer look, perhaps later today

@metivett in the mean time you can start docker

docker run --rm -it ghcr.io/feelpp/feelpp-env:ubuntu-20.04

get your branch and compile to see what is going on

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@prudhomm this PR is ready.