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Hi, ParaView 5.9 cannot be built in debug mode with gcc 9.3. Compilation fails with the following error message:

VTK/ThirdParty/ioss/vtkioss/Ioss_Assembly.C <ligne-de-commande>: erreur: expected unqualified-id before numeric constant
VTK/ThirdParty/ioss/vtkioss/Ioss_Utils.h:527:24: note: dans l'expansion de la macro "DEBUG"
  527 |   inline std::ostream &DEBUG() { return *Utils::m_debugStream; }

The issue seems to be due to the declaration of DEBUG function which name matches the preprocessor macro DEBUG Maybe there is some more subtle fix, but renaming the function:

inline std::ostream &DEBUG() { return *Utils::m_debugStream; }

to:

inline std::ostream &STREAM_DEBUG() { return *Utils::m_debugStream; }

and changing all occurences of this function solves the reported issue.

HTH, nabil.

PS: the issue can be reproduced with Fedora 30 or CentOS 7 with devtoolset-9.

paraview.0015-Paraview_VTKM_ioss.patch