dpcpp -v -std=c++17 main.cpp | grep std Intel(R) oneAPI DPC++ Compiler Pro 2021.1 (2020.8.0.0827) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/bin Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8 Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0 Candidate multilib: .;@m64 Selected multilib: .;@m64 "/glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/bin/clang++" -cc1 -triple spir64-unknown-unknown-sycldevice -fsycl -fsycl-is-device -fdeclare-spirv-builtins -mllvm -sycl-opt -aux-triple x86_64-unknown-linux-gnu -Wno-sycl-strict -sycl-std=2017 -emit-llvm-bc -emit-llvm-uselists -disable-free -disable-llvm-verifier -discard-value-names -main-file-name main.cpp -mrelocation-model static -fveclib=SVML -mframe-pointer=all -fmath-errno -fno-rounding-math -fno-verbose-asm -mconstructor-aliases -aux-target-cpu x86-64 -fno-split-dwarf-inlining -debugger-tuning=gdb -v -resource-dir /glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/lib/clang/12.0.0 -internal-isystem /glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/bin/../include/sycl -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/ipp/2021.1-beta08/include -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/ccl/2021.1-beta09/include/cpu_gpu_dpcpp -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/dev-utilities/2021.1-beta09/include -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/vpl/2021.1-beta09/include -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/tbb/2021.1-beta09/env/../include -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/include -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/dpcpp-ct/2021.1-beta09/include -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/mkl/2021.1-beta09/include -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/dnnl/2021.1-beta09/cpu_dpcpp_gpu_dpcpp/include -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/mpi/2021.1-beta09//include -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/ippcp/2021.1-beta08/include -I/glob/development-tools/versions/oneapi/beta09/inteloneapi/daal/2021.1-beta09/include -cxx-isystem /glob/development-tools/versions/oneapi/beta09/inteloneapi/clck/2021.1-beta09/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/c++/7.4.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/x86_64-linux-gnu/c++/7.4.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/x86_64-linux-gnu/c++/7.4.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/c++/7.4.0/backward -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/c++/7.4.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/x86_64-linux-gnu/c++/7.4.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/x86_64-linux-gnu/c++/7.4.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/c++/7.4.0/backward -internal-isystem /usr/local/include -internal-isystem /glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/lib/clang/12.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -internal-isystem /usr/local/include -internal-isystem /glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/lib/clang/12.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -std=c++17 -fdeprecated-macro -fdebug-compilation-dir /home/u49380/test -ferror-limit 19 -fgnuc-version=4.2.1 -fcxx-exceptions -fexceptions -fcolor-diagnostics -fsycl-unnamed-lambda -faddrsig -o /home/u49380/tmp/main-843c26.bc -x c++ main.cpp clang -cc1 version 12.0.0 based upon LLVM 12.0.0git default target x86_64-unknown-linux-gnu ignoring nonexistent directory "/include" ignoring nonexistent directory "/include" ignoring duplicate directory "/usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/x86_64-linux-gnu/c++/7.4.0" ignoring duplicate directory "/usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/c++/7.4.0" ignoring duplicate directory "/usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/x86_64-linux-gnu/c++/7.4.0" ignoring duplicate directory "/usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/x86_64-linux-gnu/c++/7.4.0" ignoring duplicate directory "/usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/c++/7.4.0/backward" ignoring duplicate directory "/usr/local/include" ignoring duplicate directory "/glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/lib/clang/12.0.0/include" ignoring duplicate directory "/usr/include/x86_64-linux-gnu" ignoring duplicate directory "/usr/include" ignoring duplicate directory "/usr/local/include" ignoring duplicate directory "/glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/lib/clang/12.0.0/include" ignoring duplicate directory "/usr/include" #include "..." search starts here: #include <...> search starts here: /glob/development-tools/versions/oneapi/beta09/inteloneapi/ipp/2021.1-beta08/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/ccl/2021.1-beta09/include/cpu_gpu_dpcpp /glob/development-tools/versions/oneapi/beta09/inteloneapi/dev-utilities/2021.1-beta09/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/vpl/2021.1-beta09/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/tbb/2021.1-beta09/env/../include /glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/dpcpp-ct/2021.1-beta09/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/mkl/2021.1-beta09/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/dnnl/2021.1-beta09/cpu_dpcpp_gpu_dpcpp/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/mpi/2021.1-beta09//include /glob/development-tools/versions/oneapi/beta09/inteloneapi/ippcp/2021.1-beta08/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/daal/2021.1-beta09/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/clck/2021.1-beta09/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/bin/../include/sycl /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/c++/7.4.0 /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/x86_64-linux-gnu/c++/7.4.0 /usr/lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/c++/7.4.0/backward /usr/local/include /glob/development-tools/versions/oneapi/beta09/inteloneapi/compiler/2021.1-beta09/linux/lib/clang/12.0.0/include /usr/include/x86_64-linux-gnu /usr/include End of search list. main.cpp:1:10: fatal error: 'filesystem' file not found #include ^~~~~~~~~~~~ 1 error generated.