python/pybind11/tools/pybind11Config.cmake.in

#[=============================================================================[.rst:

pybind11Config.cmake
####################

Exported variables
==================

This module sets the following variables in your project:

``pybind11_FOUND``
  true if pybind11 and all required components found on the system
``pybind11_VERSION``
  pybind11 version in format Major.Minor.Release
``pybind11_VERSION_TYPE``
  pybind11 version type (``dev*`` or empty for a release)
``pybind11_INCLUDE_DIRS``
  Directories where pybind11 and python headers are located.
``pybind11_INCLUDE_DIR``
  Directory where pybind11 headers are located.
``pybind11_DEFINITIONS``
  Definitions necessary to use pybind11, namely USING_pybind11.
``pybind11_LIBRARIES``
  Compile flags and python libraries (as needed) to link against.
``pybind11_LIBRARY``
  Empty.

Available components: None


Exported targets
================

If pybind11 is found, this module defines the following ``IMPORTED``
interface library targets:

``pybind11::module``
  for extension modules.
``pybind11::embed``
  for embedding the Python interpreter.

Python headers, libraries (as needed by platform), and the C++ standard
are attached to the target.

Advanced targets are also supplied - these are primary for users building
complex applications, and they are available in all modes:

``pybind11::headers``
  Just the pybind11 headers and minimum compile requirements.
``pybind11::pybind11``
  Python headers too.
``pybind11::python_link_helper``
  Just the "linking" part of ``pybind11:module``, for CMake < 3.15.
``pybind11::thin_lto``
  An alternative to ``INTERPROCEDURAL_OPTIMIZATION``.
``pybind11::lto``
  An alternative to ``INTERPROCEDURAL_OPTIMIZATION`` (also avoids thin LTO on clang).
``pybind11::windows_extras``
  Adds bigobj and mp for MSVC.

Modes
=====

There are two modes provided; classic, which is built on the old Python
discovery packages in CMake, or the new FindPython mode, which uses FindPython
from 3.12+ forward (3.15+ _highly_ recommended).

New FindPython mode
^^^^^^^^^^^^^^^^^^^

To activate this mode, either call ``find_package(Python COMPONENTS Interpreter Development)``
before finding this package, or set the ``PYBIND11_FINDPYTHON`` variable to ON. In this mode,
you can either use the basic targets, or use the FindPython tools:

.. code-block:: cmake

  find_package(Python COMPONENTS Interpreter Development)
  find_package(pybind11 CONFIG)

  # pybind11 method:
  pybind11_add_module(MyModule1 src1.cpp)

  # Python method:
  Python_add_library(MyModule2 src2.cpp)
  target_link_libraries(MyModule2 pybind11::headers)
  set_target_properties(MyModule2 PROPERTIES
                                  INTERPROCEDURAL_OPTIMIZATION ON
                                  CXX_VISIBILITY_PRESET ON
                                  VISIBILITY_INLINES_HIDDEN ON)

If you build targets yourself, you may be interested in stripping the output
for reduced size; this is the one other feature that the helper function gives you.

Classic mode
^^^^^^^^^^^^

Set PythonLibsNew variables to influence python detection and
CMAKE_CXX_STANDARD to influence standard setting.

.. code-block:: cmake

  find_package(pybind11 CONFIG REQUIRED)

  # Create an extension module
  add_library(mylib MODULE main.cpp)
  target_link_libraries(mylib PUBLIC pybind11::module)

  # Or embed the Python interpreter into an executable
  add_executable(myexe main.cpp)
  target_link_libraries(myexe PUBLIC pybind11::embed)


Hints
=====

The following variables can be set to guide the search for this package:

``pybind11_DIR``
  CMake variable, set to directory containing this Config file.
``CMAKE_PREFIX_PATH``
  CMake variable, set to root directory of this package.
``PATH``
  Environment variable, set to bin directory of this package.
``CMAKE_DISABLE_FIND_PACKAGE_pybind11``
  CMake variable, disables ``find_package(pybind11)`` when not ``REQUIRED``,
  perhaps to force internal build.

Commands
========

pybind11_add_module
^^^^^^^^^^^^^^^^^^^

This module defines the following commands to assist with creating Python modules:

.. code-block:: cmake

  pybind11_add_module(<target>
    [STATIC|SHARED|MODULE]
    [THIN_LTO] [OPT_SIZE] [NO_EXTRAS] [WITHOUT_SOABI]
    <files>...
    )

Add a module and setup all helpers. You can select the type of the library; the
default is ``MODULE``. There are several options:

``OPT_SIZE``
  Optimize for size, even if the ``CMAKE_BUILD_TYPE`` is not ``MinSizeRel``.
``THIN_LTO``
  Use thin TLO instead of regular if there's a choice (pybind11's selection
  is disabled if ``CMAKE_INTERPROCEDURAL_OPTIMIZATIONS`` is set).
``WITHOUT_SOABI``
  Disable the SOABI component (``PYBIND11_NEWPYTHON`` mode only).
``NO_EXTRAS``
  Disable all extras, exit immediately after making the module.

pybind11_strip
^^^^^^^^^^^^^^

.. code-block:: cmake

  pybind11_strip(<target>)

Strip a target after building it (linux/macOS), called by ``pybind11_add_module``.

pybind11_extension
^^^^^^^^^^^^^^^^^^

.. code-block:: cmake

    pybind11_extension(<target>)

Sets the Python extension name correctly for Python on your platform, called by
``pybind11_add_module``.

pybind11_find_import(module)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. code-block:: cmake

    pybind11_find_import(<module> [VERSION <number>] [REQUIRED] [QUIET])

See if a module is installed. Use the registered name (the one on PyPI). You
can specify a ``VERSION``, and you can specify ``REQUIRED`` or ``QUIET``. Only available if
``NOPYTHON`` mode is not active.  Sets ``module_VERSION`` and ``module_FOUND``. Caches the
result once a valid install is found.

Suggested usage
===============

Using ``find_package`` with version info is not recommended except for release versions.

.. code-block:: cmake

  find_package(pybind11 CONFIG)
  find_package(pybind11 2.9 EXACT CONFIG REQUIRED)

#]=============================================================================]
@PACKAGE_INIT@

# Location of pybind11/pybind11.h
# This will be relative unless explicitly set as absolute
set(pybind11_INCLUDE_DIR "@pybind11_INCLUDEDIR@")

set(pybind11_LIBRARY "")
set(pybind11_DEFINITIONS USING_pybind11)
set(pybind11_VERSION_TYPE "@pybind11_VERSION_TYPE@")

check_required_components(pybind11)

if(TARGET pybind11::python_link_helper)
  # This has already been setup elsewhere, such as with a previous call or
  # add_subdirectory
  return()
endif()

include("${CMAKE_CURRENT_LIST_DIR}/pybind11Targets.cmake")

# Easier to use / remember
add_library(pybind11::headers IMPORTED INTERFACE)
set_target_properties(pybind11::headers PROPERTIES INTERFACE_LINK_LIBRARIES
                                                   pybind11::pybind11_headers)

include("${CMAKE_CURRENT_LIST_DIR}/pybind11Common.cmake")

if(NOT pybind11_FIND_QUIETLY)
  message(
    STATUS
      "Found pybind11: ${pybind11_INCLUDE_DIR} (found version \"${pybind11_VERSION}${pybind11_VERSION_TYPE}\")"
  )
endif()