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* fix: PyPy needs to overrite broken FindPythonInterp values
Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* fix: add flag to opt-in to new (cross-compile) behavior
Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Apply suggestions from code review
Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Revert "feat: add entrypoint for cmake modules dir (#4258)"

This reverts commit 1d4a65e2.

* docs: revert changelog mention too

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* First draft of Eigen::Tensor support

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Fix build errors

* Weird allocator stuff?

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Remove unused + additional allocator junk

* Disable warning

* Use constexpr

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* clang tidy fixes

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Resolve comments

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Remove auto constexpr function

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Try again for older C++

* Oops forgot constexpr

* Move to new files as suggested

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* Fix weird tests

* Fix nits

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Oops, forgot import

* Fix clang 3.6 bug

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* More comprehensive test suite

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* Refactor allocators to make things more clear

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* Switch to std::copy

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* Switch to DSizes instead of array

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* Address feedback

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* Fix python + dummy c++ change to trigger build

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* Alignment

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* Add include guard

* Forgot inline

* Fix compiler warning

* Remove bad test

* Better type signatures

* Add guards to make compiler requirements more explicit

* style: pre-commit fixes

* Force rerun of tests due to flake

* style: pre-commit fixes

* Keep pragmas & all related comments together, add PLEASE KEEP IN SYNC

* Move headers out of detail

* style: pre-commit fixes

* Fix cmake

* Improve casting

* style: pre-commit fixes

* Add a ton more tests + refactor

* Improve names

* style: pre-commit fixes

* Update include/pybind11/eigen/tensor.h
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>

* Fix tests

* style: pre-commit fixes

* Update

* Add a test to verify that strange numpy arrays work

* Fix dumb compiler warning

* Better tests

* Better tests

* Fix tests

* style: pre-commit fixes

* More test fixes

* style: pre-commit fixes

* A ton more test coverage

* Fix tests

* style: pre-commit fixes

* style: pre-commit fixes

* Add back constexpr

* Another test

* style: pre-commit fixes

* Improve tests

* Whoops

* Less magic numbers

* Update tests/test_eigen_tensor.py
Co-authored-by: Sergiu Deitsch <sergiud@users.noreply.github.com>

* Update tests/test_eigen_tensor.py
Co-authored-by: Sergiu Deitsch <sergiud@users.noreply.github.com>

* style: pre-commit fixes

* Fix tests

* style: pre-commit fixes

* Fix memory leak

* style: pre-commit fixes

* Fix order

* style: pre-commit fixes

* Add test to make sure unsafe casts fail

* Minor bug fix to work on 32 bit machines

* Implement convert flag

* style: pre-commit fixes

* Switch to correct TensorMap const use

* style: pre-commit fixes

* Support older versions of eigen

* Weird c++ compilers

* Fix Eigen bug

* Fix another eigen bug

* Yet another eigen bug

* Potential flakes?

* style: pre-commit fixes

* Rerun tests with dummy exception to find out what is going on

* Another dummy test run

* Ablate more

* Found the broken test?

* One step closer

* one step further

* Double check

* one thing at a time

* Give up and disable the test

* Clang lies about being gcc

* Oops, fix matrix test

* style: pre-commit fixes

* Add tests to verify scalar conversions

* style: pre-commit fixes

* Fix nits

* Support no_array

* Fix tests

* style: pre-commit fixes

* Silence compiler warning

* Improve build system for ancient compilers

* Make clang happy

* Make gcc happy

* Implement Skylion's suggestions

* Fix warning

* Inline const pointer check

* Implement suggestions

* style: pre-commit fixes

* Improve tests

* Typo

* style: pre-commit fixes

* Support Google's build environment

* style: pre-commit fixes

* Update include/pybind11/eigen/tensor.h
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>

* style: pre-commit fixes

* Test cleanup per Skylion

* Switch to remvove_cv_t

* Cleaner test

* style: pre-commit fixes

* Remove tensor from eigen.h, update tests

* style: pre-commit fixes
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rwgk@google.com>
Co-authored-by: Aaron Gokaslan <aaronGokaslan@gmail.com>
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
Co-authored-by: Sergiu Deitsch <sergiud@users.noreply.github.com>

* [pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/Lucas-C/pre-commit-hooks: v1.3.0 → v1.3.1](https://github.com/Lucas-C/pre-commit-hooks/compare/v1.3.0...v1.3.1)
- [github.com/sirosen/texthooks: 0.3.1 → 0.4.0](https://github.com/sirosen/texthooks/compare/0.3.1...0.4.0)
- [github.com/PyCQA/pylint: v2.14.5 → v2.15.0](https://github.com/PyCQA/pylint/compare/v2.14.5...v2.15.0)
- [github.com/codespell-project/codespell: v2.1.0 → v2.2.1](https://github.com/codespell-project/codespell/compare/v2.1.0...v2.2.1

)

* Introduce .codespell-ignore-lines for safer (line-based instead of word-based) suppressions.

* Fix two issues: 1. ensure sort order; 2. remove duplicates
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rwgk@google.com>

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* add installation support for pkg-config dependency detection

pkg-config is a buildsystem-agnostic alternative to
`pybind11Config.cmake` that can be used from build systems other than
cmake.

Fixes #230

* tests: add test for pkg config
Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Use sysconfig in Python >= 3.10

Rely on sysconfig for installation paths for Python >= 3.10. distutils
has been deprecated and will be removed.

Fixes: #3677

* Explicitly select the posix_prefix scheme for platinclude on Debian

Debian's default scheme is posix_local, for installing locally-built
packages to /usr/local/.  We want to find the Python headers in /usr/,
so search posix_prefix.

* chore: drop Python 3.5 support

* chore: more fstrings with flynt's help

* ci: drop Python 3.5

* chore: bump dependency versions

* docs: touch up py::args

* tests: remove deprecation warning

* Ban smartquotes

* Very minor tweaks (by-product of reviewing PR #3719).
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rwgk@google.com>

* `#error BYE_BYE_GOLDEN_SNAKE`

* Removing everything related to 2.7 from ci.yml

* Commenting-out Centos7

* Removing `PYTHON: 27` from .appveyor.yml

* "PY2" removal, mainly from tests. C++ code is not touched.

* Systematic removal of `u` prefix from `u"..."` and `u'...'` literals. Collateral cleanup of a couple minor other things.

* Cleaning up around case-insensitive hits for `[^a-z]py.*2` in tests/.

* Removing obsolete Python 2 mention in compiling.rst

* Proper `#error` for Python 2.

* Using PY_VERSION_HEX to guard `#error "PYTHON 2 IS NO LONGER SUPPORTED.`

* chore: bump pre-commit

* style: run pre-commit for pyupgrade 3+

* tests: use sys.version_info, not PY

* chore: more Python 2 removal

* Uncommenting Centos7 block (PR #3691 showed that it is working again).

* Update pre-commit hooks

* Fix pre-commit hook

* refactor: remove Python 2 from CMake

* refactor: remove Python 2 from setup code

* refactor: simplify, better static typing

* feat: fail with nice messages

* refactor: drop Python 2 C++ code

* docs: cleanup for Python 3

* revert: intree

revert: intree

* docs: minor touchup to py2 statement
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>

* Fix module extension detection for python 3.10

* Fix for python < 3.10

* Use importlib

* ci: support Python 3.11-dev

Also update 3.10 to final, better PyPy usage

* fix: use PyFrame_GetCode on Python 3.9+

* ci: some bitiness of pypy not supported on win

* chore: update CMake support to 3.22rc1 to quiet warning

* fix: use dev version of py to fix Py 3.11

* tests: print proper Eigen version

* ci: include pypy2, not sure why

* ci: avoid running on Python 3.11 for now

* ci: fix runs

* ci: simpler PyPy usage, drop unmaintained scipy + pypy index

* ci: only binary numpy, wait on pypy 3.8

* refactor: address review

The new FindPython-based variant of the CMake scripts caches information
about the chosen Python version that can become stale. For example,
suppose I configure a simple pybind11-based project as follows

```
cmake -S . -B build -GNinja -DPython_ROOT=<path to python 3.8>
```

which will generate `my_extension.cpython-38-x86_64-linux-gnu.so`.
A subsequent change to the python version like

```
cmake -S . -B build -GNinja -DPython_ROOT=<path to python 3.9>
```

does not update all necessary build system information. In particular,
the compiled file is still called
`my_extension.cpython-38-x86_64-linux-gnu.so`.

This commit fixes the problem by detecting changes in
`Python_EXECUTABLE` and re-running Python as needed.

Note that the previous way of detecting Python does not seem to be
affected, it always specifies the right suffix.

* Apply isort

* Tweak isort config

* Add env.py as a known_first_party

* Add one missing known first party

* Make config compat with older isort versions

* Add another comment

* Revert pyproject setting

* Rollback of PR #3030 (Working around Centos 8 failure).

* Adding `-DCMAKE_BUILD_TYPE=Release`

* Improving existing workaround (undoing the originally intended rollback).

* Fixing minor documentation bug.

* mingw64 platform string is like mingw_xxx not "mingw"

See https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-python/0099-Change-the-get_platform-method-in-sysconfig-and-dist.patch



* Mingw: Do not dllexport exceptions

This is a fix for errors like:

D:/a/pybind11/pybind11/include/pybind11/detail/common.h:735:23: error: 'dllexport' implies default visibility, but 'class pybind11::builtin_exception' has already been declared with a different visibility
  735 | class PYBIND11_EXPORT builtin_exception : public std::runtime_error {
      |                       ^~~~~~~~~~~~~~~~~

* GHA: Test Mingw64 build

* fix: avoid thin binaries on mingw

* fix: drop lto on MinGW

* Mingw64: disable PYBIND11_DEPRECATED

It trigger many warnings for unknown reasons
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>

* mingw64 platform string is like mingw_xxx not "mingw"

See https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-python/0099-Change-the-get_platform-method-in-sysconfig-and-dist.patch



* Mingw: Do not dllexport exceptions

This is a fix for errors like:

D:/a/pybind11/pybind11/include/pybind11/detail/common.h:735:23: error: 'dllexport' implies default visibility, but 'class pybind11::builtin_exception' has already been declared with a different visibility
  735 | class PYBIND11_EXPORT builtin_exception : public std::runtime_error {
      |                       ^~~~~~~~~~~~~~~~~

* GHA: Test Mingw64 build

* fix: avoid thin binaries on mingw

* fix: drop lto on MinGW

* Mingw64: disable PYBIND11_DEPRECATED

It trigger many warnings for unknown reasons
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>

[skip ci]

* Splitting out pybind11/stl/filesystem.h.

To solve breakages like: https://github.com/deepmind/open_spiel/runs/2999582108

Mostly following the suggestion here: https://github.com/pybind/pybind11/pull/2730#issuecomment-750507575

Except using pybind11/stl/filesystem.h instead of pybind11/stlfs.h, as decided via chat.

stl.h restored to the exact state before merging PR #2730 via:
```
git checkout 733f8de2 stl.h
```

* Properly including new stl subdirectory in pip wheel config.

This now passes interactively:
```
pytest tests/extra_python_package/
```

* iwyu cleanup.

iwyuh.py -c -std=c++17 -DPYBIND11_TEST_BOOST -Ipybind11/include -I/usr/include/python3.9 -I/usr/include/eigen3 include/pybind11/stl/filesystem.h

* Adding PYBIND11_HAS_FILESYSTEM_IS_OPTIONAL.

* Eliminating else after return.

On Windows, clang-cl does not understand /MP.
```
clang-cl: warning: argument unused during compilation: '/MP' [-Wunused-command-line-argument]
```
with Clang 10.0.0