In pursuit of #322 this MR is in progress !463 - in order to use std::filesystem, the C++ standard must be at least 17 with a gcc version of at least 9. These upgrades went smoothly on Deception, as gcc10.2.0 was already used, but Newell is causing problems.
https://community.intel.com/t5/Intel-DevCloud/dpcpp-using-C-17-header/m-p/1212280
Now, newell is with gcc10.2.0, c++17 standard - we still get an error with std::fs
see file fs.txt fs.txt
the -lstdc++fs -std=c++17 flags are being correctly passed to gcc and mpic++, but nvcc is using the c++11 standard - this may be our culprit
I tried adding set(CUDA_NVCC_FLAGS "-std=c++17") to the main CMakeLists.txt but that did not seem to pass on the flag correctly.
Commenting out the std::fs lines in the source code with or without the NVCC flag line added causes Umpire to error.
see file nvcc17.txt nvcc17.txt
I fear that umpire6.0.0 may not allow us to use the c++17 standard. #54 #56
!463 !462 (closed)

https://gitlab.pnnl.gov/exasgd/frameworks/exago/-/issues/447
https://gitlab.pnnl.gov/exasgd/frameworks/exago/-/merge_requests/463