FE: Give prefixes to small matrices so we do not view them by default

Missing calls to PetscSafePointerPlusOffset()

Merge branch 'jolivet/fix-ubsan' into 'main'

Pacify UBSan

See merge request petsc/petsc!7158

DM: Correct misspelling

Sys: add PetscSafePointerPlusOffset() to pacify UBSan

Merge branch 'barry/2023-12-22/rm-libbase' into 'main'

LIBBASE is no longer used in make so remove it

See merge request petsc/petsc!7139

LIBBASE is no longer used in make so remove it

Remove MANSEC from makefiles it is not needed in, tutorials and tests

Merge remote-tracking branch 'origin/release'

Merge branch 'stefanozampini/minsurf-local' into 'main'

Improve support for nonlinear domain decomposition solvers

See merge request petsc/petsc!7084

DMPLEXSNES: support objective functions

Update references in the manual pages to use Sphinx citation processing

PetscFE: Add Jacobian type argument to PetscFEIntegrateBdJacobian()

FE: Integration over a cohesive cell of a non-cohesive field should use both sides

Fix PetscOptionsGetViewer() so it works in a thread-safe way

When PetscOptionsGetViewer() returns, for example, PETSC_VIEWER_STDOUT_SELF the same object is shared
by all threads that call PetscOptio

Fix PetscOptionsGetViewer() so it works in a thread-safe way

When PetscOptionsGetViewer() returns, for example, PETSC_VIEWER_STDOUT_SELF the same object is shared
by all threads that call PetscOptionsGetViewer(). In the previous code PetscObjectReference() and
dereference (via PetscViewerDestroy() where called on the viewer by multiple threads after the viewer
was accessed thus corrupting the object.

This branch introduces a PetscOptionsRestoreViewer() that allows not doing the referencing and dereferencing
on persistant viewers, thus removing the specific race condition above.

Other possible solutions include

Use a lock on each PetscObjectReference/Dereference() just in case they are shared. Could be time consuming so one
could mark each object as either threadshared or independent and only do the locks on threadshared objects. This lowers
the cost but would require more extensive changes to PETSc infrastructure. And I do not know if this shared/not shared model
is what we need in the long run, though it might be.

show more ...

Replace some guarded PetscCheck() to PetscAssert()

Merge remote-tracking branch 'origin/release'