TString.h Comilation errors due to C++ version despite ROOT having been compiled with correct version

cschloes · September 25, 2021, 6:48pm

Dear all,

I am trying to compile some code using ROOT 6.22.00 on LXPLUS. I have sourced the following:
source /cvmfs/sft.cern.ch/lcg/views/LCG_98python3/x86_64-centos7-gcc10-opt/setup.sh

I get the following error with TString.h:

In file included from /cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TMatrixTBase.h:73,
                 from /cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TMatrixT.h:23,
                 from /cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TMatrixD.h:20,
                 from /cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TDecompBase.h:26,
                 from /cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TDecompLU.h:21,
                 from /afs/cern.ch/work/c/cschloes/T2K/new_test_intallation/xsLLhFitter/src/utils/src/../include/CalcChisq.hh:7,
                 from /afs/cern.ch/work/c/cschloes/T2K/new_test_intallation/xsLLhFitter/src/utils/src/CalcChisq.cc:1:
/cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TString.h:834:53: error: ‘string_view’ in namespace ‘std’ does not name a type
  834 | inline Bool_t operator==(const char *s1, const std::string_view &s2)
      |                                                     ^~~~~~~~~~~
/cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TString.h:834:48: note: ‘std::string_view’ is only available from C++17 onwards
  834 | inline Bool_t operator==(const char *s1, const std::string_view &s2)
      |                                                ^~~
/cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TString.h:834:15: error: ‘Bool_t operator==(const char*, const int&)’ must have an argument of class or enumerated type
  834 | inline Bool_t operator==(const char *s1, const std::string_view &s2)
      |               ^~~~~~~~
/cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TString.h:839:37: error: ‘string_view’ in namespace ‘std’ does not name a type
  839 | inline Bool_t operator==(const std::string_view &s1, const char *s2)
      |                                     ^~~~~~~~~~~
/cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TString.h:839:32: note: ‘std::string_view’ is only available from C++17 onwards
  839 | inline Bool_t operator==(const std::string_view &s1, const char *s2)
      |                                ^~~
/cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TString.h:839:15: error: ‘Bool_t operator==(const int&, const char*)’ must have an argument of class or enumerated type
  839 | inline Bool_t operator==(const std::string_view &s1, const char *s2)
      |               ^~~~~~~~
/cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TString.h:852:37: error: ‘string_view’ in namespace ‘std’ does not name a type
  852 |   std::string printValue(const std::string_view* val);
      |                                     ^~~~~~~~~~~
/cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include/TString.h:852:32: note: ‘std::string_view’ is only available from C++17 onwards
  852 |   std::string printValue(const std::string_view* val);
      |                                ^~~
make[2]: *** [src/utils/CMakeFiles/xslfutils.dir/src/CalcChisq.cc.o] Error 1
make[1]: *** [src/utils/CMakeFiles/xslfutils.dir/all] Error 2
make: *** [all] Error 2

I thought it was because ROOT had not been compiled with the same C++ version but when I use root-config --cflags, I get the following:

-pthread -std=c++17 -m64 -I/cvmfs/sft.cern.ch/lcg/releases/ROOT/v6.22.00-be0a0/x86_64-centos7-gcc10-opt/include

I am also compiling using cmake -DCMAKE_CXX_VERSION=c++17.

Do you know what I might be doing wrong?

Many thanks in advance!!

ROOT Version: 6.22.00
Platform: LCG_98python3/x86_64-centos7-gcc10-opt
Compiler: cmake version 3.17.3

Wile_E_Coyote · September 25, 2021, 7:43pm

Maybe: cmake -DCMAKE_CXX_STANDARD=17

cschloes · September 26, 2021, 5:53am

Thank you for the suggestion. I just tried it but unfortunately it still gives me the same error.

Wile_E_Coyote · September 26, 2021, 8:58am

It could be that your “some code” needs some special flag.
It could also be that it does not support “c++17” at all (e.g., it supports at most “c++14” or “c++11”).

For example, newer Geant 4 supports (note also “=14”): cmake -DGEANT4_BUILD_CXXSTD=14
Older Geant 4 supports (note also “=c++11”): cmake -DGEANT4_BUILD_CXXSTD=c++11

cschloes · September 27, 2021, 10:48am

Thanks for the reply. I managed to solve the issue by sourcing the following:

source /cvmfs/sft.cern.ch/lcg/views/LCG_98python3/x86_64-centos7-gcc10-opt/setup.sh
source /cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.24.06/x86_64-centos7-gcc48-opt/bin/thisroot.sh

system · October 11, 2021, 10:48am

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