[petsc-dev] PC defaults when matrix is not available at PCSetFromOptions

[Jed Brown]

With the now-recommended approach of SNESSetDM(), a matrix is no longer
available for PCGetDefaultType_Private(), so stuff like this fails:

~/petsc/src/snes/examples/tutorials$ ./ex5 -dm_mat_type sbaij
[0]PETSC ERROR: --------------------- Error Message
------------------------------------
[0]PETSC ERROR: No support for this operation for this object type!
[0]PETSC ERROR: Factor type not supported!
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR: Petsc Development HG revision:
fb0b659c7d3475598a50a3736d056cce163b2de9  HG Date: Sun Apr 15 00:02:43 2012
+0000
[0]PETSC ERROR: See docs/changes/index.html for recent updates.
[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[0]PETSC ERROR: See docs/index.html for manual pages.
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR: ./ex5 on a mpich named batura by jed Sun May  6 11:25:55
2012
[0]PETSC ERROR: Libraries linked from /home/jed/petsc/mpich/lib
[0]PETSC ERROR: Configure run at Tue Apr 17 15:54:40 2012
[0]PETSC ERROR: Configure options --download-ams --download-blacs
--download-chaco --download-hypre --download-metis --download-ml
--download-parmetis --download-spai --download-spooles --download-sundials
--download-superlu --download-superlu_dist --download-triangle
--with-blas-lapack=/usr --with-c2html --with-cholmod-dir=/usr --with-lgrind
--with-mpi-dir=/opt/mpich2 --with-pcbddc --with-pthreadclasses
--with-shared-libraries --with-single-library=0 --with-sowing
--with-umfpack-dir=/usr --with-x -PETSC_ARCH=mpich
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR: MatGetFactor_seqsbaij_petsc() line 1817 in
/home/jed/petsc/src/mat/impls/sbaij/seq/sbaij.c
[0]PETSC ERROR: MatGetFactor() line 3990 in
/home/jed/petsc/src/mat/interface/matrix.c
[0]PETSC ERROR: PCSetUp_ILU() line 214 in
/home/jed/petsc/src/ksp/pc/impls/factor/ilu/ilu.c
[0]PETSC ERROR: PCSetUp() line 832 in
/home/jed/petsc/src/ksp/pc/interface/precon.c
[0]PETSC ERROR: KSPSetUp() line 278 in
/home/jed/petsc/src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: KSPSolve() line 402 in
/home/jed/petsc/src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: SNES_KSPSolve() line 4224 in
/home/jed/petsc/src/snes/interface/snes.c
[0]PETSC ERROR: SNESSolve_LS() line 200 in
/home/jed/petsc/src/snes/impls/ls/ls.c
[0]PETSC ERROR: SNESSolve() line 3442 in
/home/jed/petsc/src/snes/interface/snes.c
[0]PETSC ERROR: main() line 152 in src/snes/examples/tutorials/ex5.c
application called MPI_Abort(MPI_COMM_WORLD, 56) - process 0

What are the alternatives to moving matrix creation (via DM) all the way up
here?
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