hypre: Fix compiler warnings for mixed int configuration

hypre: Add PetscCallHYPRE macro to allow for printing HYPRE error strings

PCHPDDM: add support for MatProduct_AtB_Harmonic

Merge remote-tracking branch 'origin/release'

Make clearer the relationship between KSPSetOperators and PCSetOperators.

cleanup suggestions by @BarrySmith

also noticed a few stray functions not marked as external and put them
into modules

use modules instead of external

this allows for argument checking

remove labeled do loops

labeled do loops confused fprettify, so used it to rectify indentation

place all the include statements at the top

Repeated inclusion in multiple location, e.g. at the start of a
module or function is not needed. This becomes clear if all includes are
outside of the ac

place all the include statements at the top

Repeated inclusion in multiple location, e.g. at the start of a
module or function is not needed. This becomes clear if all includes are
outside of the actual Fortran code.
Added regex to check that with the help of @sbalay

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Remove more unneeded parentheses

Merge remote-tracking branch 'origin/release'

Merge branch 'jolivet/fix-arrays' into 'release'

Fix error in MatTransposeMatMultSymbolic() in case of empty rows

See merge request petsc/petsc!8773

Allow CF relaxation on GPU

checkbadSource: enforce proper style in makefiles

Have KSPView() indicate when there is no convergence test.

Reported-by: Elana Moral Sanchez

Remove dead code

Merge remote-tracking branch 'origin/release'

Fix typos

Remove unneeded macros

Remove left over parts of PCSetPreSolve() that were mistakenly left in !8419

PCHPDDM: check --with-debugging that -pc_hpddm_has_neumann is correct

Thanks-to: Eric Chamberland @eric.chamberland, Félix Kwok <felix.kwok@mat.ulaval.ca>

Introduce PetscFortranCallbackFn to be used instead of PetscVoidFn for Fortran callback functions

Also fix incorrect use of SNESFunctionFn and SNESJacobianFn in SNES Fortran manual stub

Change use of void (*)(void) and void (**)(void) in the PETSc API to PetscVoidFn * and PetscVoidFn ** or PetscErrorCodeFn * or PetscErrorCodeFn **

Merge branch 'stefanozampini/fixes-before-release' into 'main'

small fixes before release

See merge request petsc/petsc!8717

Merge branch 'barry/2025-08-27/docs-pcmg' into 'main'

Improve PCMG docs and code regarding default to one level and no true multigrid

See merge request petsc/petsc!8677