Update the libpng downloaded to fix portability problem on macOS.

Reported-by: Yang Zongze

Fix for GCC 15 switching from -std=gnu17 to -std=gnu23

Merge branch 'barry/2025-04-15/add-more-pkg-config-stuff/release' into 'release'

Add linker flags and mpiexec information to PETSc generated pkg-config file

See merge request petsc/petsc!8319

Add ldflags linker flags and mpiexec information to PETSc generated pkg-config file

The variable ldflags is introduced instead of adding the ldflags information directly to the LIBS variable to allo

Add ldflags linker flags and mpiexec information to PETSc generated pkg-config file

The variable ldflags is introduced instead of adding the ldflags information directly to the LIBS variable to allow
users to still maintain fine scale control over the processing of the linker libraries with flags such as
--libs-only-L --libs-only-other

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Merge remote-tracking branch 'origin/release'

Merge branch 'jczhang/2025-04-15/support-openmpi-hip' into 'main'

Add UCX to support Open MPI with ROCm

See merge request petsc/petsc!8321

petsc4py: do not let setup.py add extra flags with Intel compilers

Open MPI: add UCX to support Open MPI with ROCm

Config: evaluate version string to handle version expressions

such as version = '((((1)<<24)|((18)<<16)))'.
Only after evaluation, it could be properly processed by versionToStandardForm

Config: add skipMPIDependency flag to packages to indicate if a dependency on MPI package should be added or skipped

configure: update CMake/SuiteSparse

Drop support of BlueGene

Merge remote-tracking branch 'origin/release'

Merge branch 'balay/valgrind-ucx' into 'release'

CI: switch valgrind job to use mpich with ch4:ucx

See merge request petsc/petsc!8285

CI: use lower MAKE_LOAD value - to reduce over-sbuscription for mpich/ch4

configure: print correct location of SLEPc examples

Reported-by: Victor Eijkhout <eijkhout@tacc.utexas.edu>

configure: update CMake

Merge remote-tracking branch 'origin/release'

Add initial version PetscRegressor, part of the planned machine learning (ML) toolkit

Co-authored-by: Mr. Hong Zhang <hongzhang@anl.gov>
Co-authored-by: Hansol Suh <hsuh@anl.gov>
Co-authored-by: Bar

Add initial version PetscRegressor, part of the planned machine learning (ML) toolkit

Co-authored-by: Mr. Hong Zhang <hongzhang@anl.gov>
Co-authored-by: Hansol Suh <hsuh@anl.gov>
Co-authored-by: Barry Smith <bsmith@petsc.dev>
Co-authored-by: Toby Isaac <toby.isaac@gmail.com>
Co-authored-by: Satish Balay <balay@mcs.anl.gov>

Mr. Hong Zhang developed the petsc4py interface and examples.
Hansol Suh provided extensive help with updating the code to the latest PETSc coding guidelines and APIs, some documentation development, getting documentation to build correctly, getting new tests into the test harness, and numerous big fixes plus minor changes.
Barry Smith provided extensive feedback and code to get the Fortran interfaces and documentation build working.
Toby Isaac provided a fix to prevent breakage with complex-arithmetic builds.
Satish Balay provided important help with fixing builds.

Thanks-to: Pierre Jolivet <pierre@joliv.et>
Thanks-to: Jed Brown <jed@jedbrown.org>
Thanks-to: Jose Roman <jroman@dsic.upv.es>
Thanks-to: Stefano Zampini <stefano.zampini@gmail.com>

Pierre, Jed, Jose, and Stefano provided extremely helpful feedback and suggestions during the merge review process.

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configure: update muparser/ScaLAPACK to avoid failures with CMake 4.0.0

CMake: add necessary flags for deprecated packages

Merge remote-tracking branch 'origin/release'

Merge branch 'ptscotch-bison' into 'release'

ptscotch: bison is only required to build, not link

See merge request petsc/petsc!8267

Merge branch 'balay/petsc4py-py-ver-check' into 'release'

petsc4py: update python version check [min 3.6]

See merge request petsc/petsc!8251

configure: update HYPRE and p4est