[petsc-dev] PetscUse/TryMethod

Satish Balay balay at mcs.anl.gov
Sun Apr 3 10:13:01 CDT 2022

Note this  is not just 'users should update their code' issue.
- all packages (that use petsc) would need to do this update
- and this update doesn't always happen - so pakages will stay at old release - some might not
- so now we cant build PETSc with both these packages together.

this type of change causes major issues in xsdk ecosystem (depends on how many direct/indirect dependencies are on the given package)

Just noticed - CHKERRQ() got removed from fortran interface - breaking pflotran


[also CHKERRABORT]. Perhaps they can be added back in.

$ git diff release-3.16..release include/petsc/finclude/petscsys.h
diff --git a/include/petsc/finclude/petscsys.h b/include/petsc/finclude/petscsys.h
 #define SETERRABORT(c,ierr,s)  call PetscError(c,ierr,0,s); call MPI_Abort(c,ierr)
-#define CHKERRQ(ierr) if (ierr .ne. 0) then;call PetscErrorF(ierr);return;endif
+#define PetscCall(ierr) if (ierr .ne. 0) then;call PetscErrorF(ierr);return;endif
 #define CHKERRA(ierr) if (ierr .ne. 0) then;call PetscErrorF(ierr);call MPIU_Abort(PETSC_COMM_SELF,ierr);endif
-#define CHKERRABORT(c,ierr) if (ierr .ne. 0) then;call PetscErrorF(ierr);call MPI_Abort(c,ierr);endif
+#define PetscCallAbort(c,ierr) if (ierr .ne. 0) then;call PetscErrorF(ierr);call MPI_Abort(c,ierr);endif
 #define CHKMEMQ call chkmemfortran(__LINE__,__FILE__,ierr)


On Sun, 3 Apr 2022, Barry Smith wrote:

>    To use the latest version of PETSc, each user needs to remove the error checks on these calls. The resulting code will work with previous versions of PETSc as well as the current version of PETSc.  PETSc has never promised complete backward compatibility in the sense of promising that one can use new PETSc releases without any changes to their code; the documentation has always stated new releases will contain changes in the API. We began using depreciate a few years ago to limit the number of changes that needed to be made immediately for each release but depreciate is not suitable for all changes and so users do need to make some changes for each new release. 
> > On Apr 3, 2022, at 7:23 AM, Lisandro Dalcin <dalcinl at gmail.com> wrote:
> > 
> > The recent PetscUse/TryMethod changes are backward incompatible. Third-party codes cannot compile without modification. Our users deserve better.
> > 
> > 
> > -- 
> > Lisandro Dalcin
> > ============
> > Senior Research Scientist
> > Extreme Computing Research Center (ECRC)
> > King Abdullah University of Science and Technology (KAUST)
> > http://ecrc.kaust.edu.sa/ <http://ecrc.kaust.edu.sa/>

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