Merge branch 'PR--config-cross-compilation' into 'main'

config,petsc4py: support cross-compilation

See merge request petsc/petsc!3859

config,petsc4py: support cross-compilation

On some HPC clusters it is necessary to cross-compile because the build hosts
(login nodes) have a different architecture (or CPU family) from worker ndoes

config,petsc4py: support cross-compilation

On some HPC clusters it is necessary to cross-compile because the build hosts
(login nodes) have a different architecture (or CPU family) from worker ndoes,
for example on ALCF Theta HPC cluster workers are Xeon Phi, so turning on
cpu-family optimizations turns the build into a cross-compilation. The current
./configure fails with SIGILL (Illegal instruction) when it tries to import
`numpy`, which had been cross-compiled and cannot run on the build host.

This patch simply adds (to `./configure` and to `petsc4py`'s `setup.py`) a
means to suppress autodetection operations that involve loading dependencies
for checks and to get meta info like include. Users who cross-compile can use
these arguments to pass the meta info explicitly so that it doesn't need to
be autodetected on the build host.

To interface into `setup.py` an env var is used, because there doesn't seem
to be any better alternative. We don't want to mess with setuptools's
built-in processing of command-line arguments; and extending that seems to
be possible only per command, which is not useful for getting the information
we need at the top-level scope and is also needlessly complicated.

Signed-off-by: Alexei Colin <acolin@isi.edu>

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Merge remote-tracking branch 'origin/release'

Merge branch 'dalcinl/petsc4py' into 'release'

petsc4py: Fixes for proper tarball generation

See merge request petsc/petsc!3811

petsc4py: Build of extension modules now depends on PETSc header files

petsc4py: Cython wrapper generator should not depend on PETSc header files

Merge remote-tracking branch 'origin/release'

Merge branch 'dalcinl/petsc4py/release' into 'release'

petsc4py: Update Cython

See merge request petsc/petsc!3533

petsc4py: Update Cython build

* Set `language_level` to `3str` if supported (Cython >= 0.29)
* Initial preparations for upcoming release Cython 3.0
* Require Cython >= 0.24, older versions do not lo

petsc4py: Update Cython build

* Set `language_level` to `3str` if supported (Cython >= 0.29)
* Initial preparations for upcoming release Cython 3.0
* Require Cython >= 0.24, older versions do not longer work

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petsc4py: require Cython for in-tree petsc4py

Merge branch 'barry/2020-11-13/fix-petsc4py-dependencies' into 'master'

Barry/2020 11 13/fix petsc4py dependencies

See merge request petsc/petsc!3417

Fix petsc4py dependencies on PETSc includes, if any change it reruns cython

This also includes configuring with a new PETSC_ARCH

Also doesn't recompile the C code everytime make all is run when it

Fix petsc4py dependencies on PETSc includes, if any change it reruns cython

This also includes configuring with a new PETSC_ARCH

Also doesn't recompile the C code everytime make all is run when it does not need to

Remove --download-petsc4py that makes a symbolic link of src/binding/petsc4py
Instead support --with-petsc4py that just builds petsc4py in place without the link

Lisandro Dalcin provided the fix for python 2 and OSX hardening requirement

Commit-type: bug-fix
/spend 2.5h
Thanks-to: Satish Balay <balay@mcs.anl.gov>
Thanks-to: Lisandro Dalcin

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Merge branch 'barry/2020-11-11/docs-mofem' into 'master'

Barry/2020 11 11/docs mofem

See merge request petsc/petsc!3412

Update docs regarding Petsc4py installing, location, and add link to petsc4py docs

Commit-type: docs
/spend 1h

Merge branch 'balay/import-petsc4py' into 'master'

Balay/import petsc4py

Closes #276, #25, #121, and #667

See merge request petsc/petsc!3093

Add 'src/binding/petsc4py/' from commit '9d8b840ed7f345b561d77f5729d2e92238bc13e0'

git-subtree-dir: src/binding/petsc4py
git-subtree-mainline: 2d88a74bccb5e37fbc4e61aca4ca0ae8418199f0
git-subtree-sp

Add 'src/binding/petsc4py/' from commit '9d8b840ed7f345b561d77f5729d2e92238bc13e0'

git-subtree-dir: src/binding/petsc4py
git-subtree-mainline: 2d88a74bccb5e37fbc4e61aca4ca0ae8418199f0
git-subtree-split: 9d8b840ed7f345b561d77f5729d2e92238bc13e0

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