[petsc-users] Redefining MPI functions as macros can break C++ code

[Erik Schnetter]

PETSc redefines MPI functions as macros when logging is enabled. This
breaks some C++ code; see e.g. <
https://github.com/AMReX-Codes/amrex/pull/3005> for an example. The reason
is that macros get confused about commas in template arguments.

It would be convenient if PETSc used a different way to log MPI function
calls, but I can't think of a good way. Alternatively, logging could be
disabled by default, or MPI logging could be disabled by default, or there
could be a simple way to opt out (e.g. use `#define PETSC_LOG_MPI` after
`#include <petsc.h>` to enable it for a source file).

-erik

-- 
Erik Schnetter <eschnetter at perimeterinstitute.ca>
http://www.perimeterinstitute.ca/personal/eschnetter/
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