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74439a64a2
pybind11/CMakeLists.txt
Ralf W. Grosse-Kunstleve 0e2c3e5db4
Add pybind11/gil_safe_call_once.h (to fix deadlocks in pybind11/numpy.h) (#4877) 
* LazyInitializeAtLeastOnceDestroyNever v1

* Go back to using `union` as originally suggested by jbms@. The trick (also suggested by jbms@) is to add empty ctor + dtor.

* Revert "Go back to using `union` as originally suggested by jbms@. The trick (also suggested by jbms@) is to add empty ctor + dtor."

This reverts commit e7b8c4f0fc.

* Remove `#include <stdalign.h>`

* `include\pybind11/numpy.h(24,10): fatal error C1083: Cannot open include file: 'stdalign.h': No such file or directory`

* @tkoeppe wrote: this is a C interop header (and we're not writing C)

* Suppress gcc 4.8.5 (CentOS 7) warning.

```
include/pybind11/eigen/../numpy.h:63:53: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
         return *reinterpret_cast<T *>(value_storage_);
                                                     ^
```

* Replace comments:

Document PRECONDITION.

Adopt comment suggested by @tkoeppe: https://github.com/pybind/pybind11/pull/4877#discussion_r1350356093

* Adopt suggestion by @tkoeppe:

* https://github.com/pybind/pybind11/pull/4877#issuecomment-1752969127

* https://godbolt.org/z/Wa79nKz6e

* Add `PYBIND11_CONSTINIT`, but it does not work for the current use cases:

```
g++ -o pybind11/tests/test_numpy_array.os -c -std=c++20 -fPIC -fvisibility=hidden -O0 -g -Wall -Wextra -Wconversion -Wcast-qual -Wdeprecated -Wundef -Wnon-virtual-dtor -Wunused-result -Werror -isystem /usr/include/python3.11 -isystem /usr/include/eigen3 -DPYBIND11_STRICT_ASSERTS_CLASS_HOLDER_VS_TYPE_CASTER_MIX -DPYBIND11_ENABLE_TYPE_CASTER_ODR_GUARD_IF_AVAILABLE -DPYBIND11_TEST_BOOST -Ipybind11/include -I/usr/local/google/home/rwgk/forked/pybind11/include -I/usr/local/google/home/rwgk/clone/pybind11/include /usr/local/google/home/rwgk/forked/pybind11/tests/test_numpy_array.cpp
```

```
In file included from /usr/local/google/home/rwgk/forked/pybind11/tests/test_numpy_array.cpp:10:
/usr/local/google/home/rwgk/forked/pybind11/include/pybind11/numpy.h: In static member function ‘static pybind11::detail::npy_api& pybind11::detail::npy_api::get()’:
/usr/local/google/home/rwgk/forked/pybind11/include/pybind11/numpy.h:258:82: error: ‘constinit’ variable ‘api_init’ does not have a constant initializer
  258 |         PYBIND11_CONSTINIT static LazyInitializeAtLeastOnceDestroyNever<npy_api> api_init;
      |                                                                                  ^~~~~~~~
```

```
In file included from /usr/local/google/home/rwgk/forked/pybind11/tests/test_numpy_array.cpp:10:
/usr/local/google/home/rwgk/forked/pybind11/include/pybind11/numpy.h: In static member function ‘static pybind11::object& pybind11::dtype::_dtype_from_pep3118()’:
/usr/local/google/home/rwgk/forked/pybind11/include/pybind11/numpy.h:697:13: error: ‘constinit’ variable ‘imported_obj’ does not have a constant initializer
  697 |             imported_obj;
      |             ^~~~~~~~~~~~
```

* Revert "Add `PYBIND11_CONSTINIT`, but it does not work for the current use cases:"

This reverts commit f07b28bda9.

* Reapply "Add `PYBIND11_CONSTINIT`, but it does not work for the current use cases:"

This reverts commit 36be645758.

* Add Default Member Initializer on `value_storage_` as suggested by @tkoeppe:

https://github.com/pybind/pybind11/pull/4877#issuecomment-1753201342

This fixes the errors reported under commit f07b28bda9.

* Fix copy-paste-missed-a-change mishap in commit 88cec1152a.

* Semi-paranoid placement new (based on https://github.com/pybind/pybind11/pull/4877#discussion_r1350573114).

* Move PYBIND11_CONSTINIT to detail/common.h

* Move code to the right places, rename new class and some variables.

* Fix oversight: update tests/extra_python_package/test_files.py

* Get the name right first.

* Use `std::call_once`, `std::atomic`, following a pattern developed by @tkoeppe

* Make the API more self-documenting (and possibly more easily reusable).

* google-clang-tidy IWYU fixes

* Rewrite comment as suggested by @tkoeppe

* Update test_exceptions.cpp and exceptions.rst

* Fix oversight in previous commit: add `PYBIND11_CONSTINIT`

* Make `get_stored()` non-const for simplicity.

As suggested by @tkoeppe: not seeing any reasonable use in which `get_stored` has to be const.

* Add comment regarding `KeyboardInterrupt` behavior, based heavily on information provided by @jbms.

* Add `assert(PyGILState_Check())` in `gil_scoped_release` ctor (simple & non-simple implementation) as suggested by @EthanSteinberg.

* Fix oversight in previous commit (missing include cassert).

* Remove use of std::atomic, leaving comments with rationale, why it is not needed.

* Rewrite comment re `std:optional` based on deeper reflection (aka 2nd thoughts).

* Additional comment with the conclusion of a discussion under PR #4877.

* https://github.com/pybind/pybind11/pull/4877#issuecomment-1757363179

* Small comment changes suggested by @tkoeppe.
2023-10-11 21:05:31 -07:00

335 lines
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CMake
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# CMakeLists.txt -- Build system for the pybind11 modules
#
# Copyright (c) 2015 Wenzel Jakob <wenzel@inf.ethz.ch>
#
# All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.
# Propagate this policy (FindPythonInterp removal) so it can be detected later
if(NOT CMAKE_VERSION VERSION_LESS "3.27")
cmake_policy(GET CMP0148 _pybind11_cmp0148)
endif()
cmake_minimum_required(VERSION 3.5)
# The `cmake_minimum_required(VERSION 3.5...3.26)` syntax does not work with
# some versions of VS that have a patched CMake 3.11. This forces us to emulate
# the behavior using the following workaround:
if(${CMAKE_VERSION} VERSION_LESS 3.26)
cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
else()
cmake_policy(VERSION 3.26)
endif()
if(_pybind11_cmp0148)
cmake_policy(SET CMP0148 ${_pybind11_cmp0148})
unset(_pybind11_cmp0148)
endif()
# Avoid infinite recursion if tests include this as a subdirectory
if(DEFINED PYBIND11_MASTER_PROJECT)
return()
endif()
# Extract project version from source
file(STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/include/pybind11/detail/common.h"
pybind11_version_defines REGEX "#define PYBIND11_VERSION_(MAJOR|MINOR|PATCH) ")
foreach(ver ${pybind11_version_defines})
if(ver MATCHES [[#define PYBIND11_VERSION_(MAJOR|MINOR|PATCH) +([^ ]+)$]])
set(PYBIND11_VERSION_${CMAKE_MATCH_1} "${CMAKE_MATCH_2}")
endif()
endforeach()
if(PYBIND11_VERSION_PATCH MATCHES [[\.([a-zA-Z0-9]+)$]])
set(pybind11_VERSION_TYPE "${CMAKE_MATCH_1}")
endif()
string(REGEX MATCH "^[0-9]+" PYBIND11_VERSION_PATCH "${PYBIND11_VERSION_PATCH}")
project(
pybind11
LANGUAGES CXX
VERSION "${PYBIND11_VERSION_MAJOR}.${PYBIND11_VERSION_MINOR}.${PYBIND11_VERSION_PATCH}")
# Standard includes
include(GNUInstallDirs)
include(CMakePackageConfigHelpers)
include(CMakeDependentOption)
if(NOT pybind11_FIND_QUIETLY)
message(STATUS "pybind11 v${pybind11_VERSION} ${pybind11_VERSION_TYPE}")
endif()
# Check if pybind11 is being used directly or via add_subdirectory
if(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
### Warn if not an out-of-source builds
if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
set(lines
"You are building in-place. If that is not what you intended to "
"do, you can clean the source directory with:\n"
"rm -r CMakeCache.txt CMakeFiles/ cmake_uninstall.cmake pybind11Config.cmake "
"pybind11ConfigVersion.cmake tests/CMakeFiles/\n")
message(AUTHOR_WARNING ${lines})
endif()
set(PYBIND11_MASTER_PROJECT ON)
if(OSX AND CMAKE_VERSION VERSION_LESS 3.7)
# Bug in macOS CMake < 3.7 is unable to download catch
message(WARNING "CMAKE 3.7+ needed on macOS to download catch, and newer HIGHLY recommended")
elseif(WINDOWS AND CMAKE_VERSION VERSION_LESS 3.8)
# Only tested with 3.8+ in CI.
message(WARNING "CMAKE 3.8+ tested on Windows, previous versions untested")
endif()
message(STATUS "CMake ${CMAKE_VERSION}")
if(CMAKE_CXX_STANDARD)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
endif()
set(pybind11_system "")
set_property(GLOBAL PROPERTY USE_FOLDERS ON)
else()
set(PYBIND11_MASTER_PROJECT OFF)
set(pybind11_system SYSTEM)
endif()
# Options
option(PYBIND11_INSTALL "Install pybind11 header files?" ${PYBIND11_MASTER_PROJECT})
option(PYBIND11_TEST "Build pybind11 test suite?" ${PYBIND11_MASTER_PROJECT})
option(PYBIND11_NOPYTHON "Disable search for Python" OFF)
option(PYBIND11_SIMPLE_GIL_MANAGEMENT
"Use simpler GIL management logic that does not support disassociation" OFF)
set(PYBIND11_INTERNALS_VERSION
""
CACHE STRING "Override the ABI version, may be used to enable the unstable ABI.")
if(PYBIND11_SIMPLE_GIL_MANAGEMENT)
add_compile_definitions(PYBIND11_SIMPLE_GIL_MANAGEMENT)
endif()
cmake_dependent_option(
USE_PYTHON_INCLUDE_DIR
"Install pybind11 headers in Python include directory instead of default installation prefix"
OFF "PYBIND11_INSTALL" OFF)
cmake_dependent_option(PYBIND11_FINDPYTHON "Force new FindPython" OFF
"NOT CMAKE_VERSION VERSION_LESS 3.12" OFF)
# NB: when adding a header don't forget to also add it to setup.py
set(PYBIND11_HEADERS
include/pybind11/detail/class.h
include/pybind11/detail/common.h
include/pybind11/detail/descr.h
include/pybind11/detail/init.h
include/pybind11/detail/internals.h
include/pybind11/detail/type_caster_base.h
include/pybind11/detail/typeid.h
include/pybind11/attr.h
include/pybind11/buffer_info.h
include/pybind11/cast.h
include/pybind11/chrono.h
include/pybind11/common.h
include/pybind11/complex.h
include/pybind11/options.h
include/pybind11/eigen.h
include/pybind11/eigen/common.h
include/pybind11/eigen/matrix.h
include/pybind11/eigen/tensor.h
include/pybind11/embed.h
include/pybind11/eval.h
include/pybind11/gil.h
include/pybind11/gil_safe_call_once.h
include/pybind11/iostream.h
include/pybind11/functional.h
include/pybind11/numpy.h
include/pybind11/operators.h
include/pybind11/pybind11.h
include/pybind11/pytypes.h
include/pybind11/stl.h
include/pybind11/stl_bind.h
include/pybind11/stl/filesystem.h
include/pybind11/type_caster_pyobject_ptr.h
include/pybind11/typing.h)
# Compare with grep and warn if mismatched
if(PYBIND11_MASTER_PROJECT AND NOT CMAKE_VERSION VERSION_LESS 3.12)
file(
GLOB_RECURSE _pybind11_header_check
LIST_DIRECTORIES false
RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}"
CONFIGURE_DEPENDS "include/pybind11/*.h")
set(_pybind11_here_only ${PYBIND11_HEADERS})
set(_pybind11_disk_only ${_pybind11_header_check})
list(REMOVE_ITEM _pybind11_here_only ${_pybind11_header_check})
list(REMOVE_ITEM _pybind11_disk_only ${PYBIND11_HEADERS})
if(_pybind11_here_only)
message(AUTHOR_WARNING "PYBIND11_HEADERS has extra files:" ${_pybind11_here_only})
endif()
if(_pybind11_disk_only)
message(AUTHOR_WARNING "PYBIND11_HEADERS is missing files:" ${_pybind11_disk_only})
endif()
endif()
# CMake 3.12 added list(TRANSFORM <list> PREPEND
# But we can't use it yet
string(REPLACE "include/" "${CMAKE_CURRENT_SOURCE_DIR}/include/" PYBIND11_HEADERS
"${PYBIND11_HEADERS}")
# Cache variable so this can be used in parent projects
set(pybind11_INCLUDE_DIR
"${CMAKE_CURRENT_LIST_DIR}/include"
CACHE INTERNAL "Directory where pybind11 headers are located")
# Backward compatible variable for add_subdirectory mode
if(NOT PYBIND11_MASTER_PROJECT)
set(PYBIND11_INCLUDE_DIR
"${pybind11_INCLUDE_DIR}"
CACHE INTERNAL "")
endif()
# Note: when creating targets, you cannot use if statements at configure time -
# you need generator expressions, because those will be placed in the target file.
# You can also place ifs *in* the Config.in, but not here.
# This section builds targets, but does *not* touch Python
# Non-IMPORT targets cannot be defined twice
if(NOT TARGET pybind11_headers)
# Build the headers-only target (no Python included):
# (long name used here to keep this from clashing in subdirectory mode)
add_library(pybind11_headers INTERFACE)
add_library(pybind11::pybind11_headers ALIAS pybind11_headers) # to match exported target
add_library(pybind11::headers ALIAS pybind11_headers) # easier to use/remember
target_include_directories(
pybind11_headers ${pybind11_system} INTERFACE $<BUILD_INTERFACE:${pybind11_INCLUDE_DIR}>
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
target_compile_features(pybind11_headers INTERFACE cxx_inheriting_constructors cxx_user_literals
cxx_right_angle_brackets)
if(NOT "${PYBIND11_INTERNALS_VERSION}" STREQUAL "")
target_compile_definitions(
pybind11_headers INTERFACE "PYBIND11_INTERNALS_VERSION=${PYBIND11_INTERNALS_VERSION}")
endif()
else()
# It is invalid to install a target twice, too.
set(PYBIND11_INSTALL OFF)
endif()
include("${CMAKE_CURRENT_SOURCE_DIR}/tools/pybind11Common.cmake")
# https://github.com/jtojnar/cmake-snips/#concatenating-paths-when-building-pkg-config-files
# TODO: cmake 3.20 adds the cmake_path() function, which obsoletes this snippet
include("${CMAKE_CURRENT_SOURCE_DIR}/tools/JoinPaths.cmake")
# Relative directory setting
if(USE_PYTHON_INCLUDE_DIR AND DEFINED Python_INCLUDE_DIRS)
file(RELATIVE_PATH CMAKE_INSTALL_INCLUDEDIR ${CMAKE_INSTALL_PREFIX} ${Python_INCLUDE_DIRS})
elseif(USE_PYTHON_INCLUDE_DIR AND DEFINED PYTHON_INCLUDE_DIR)
file(RELATIVE_PATH CMAKE_INSTALL_INCLUDEDIR ${CMAKE_INSTALL_PREFIX} ${PYTHON_INCLUDE_DIRS})
endif()
if(PYBIND11_INSTALL)
install(DIRECTORY ${pybind11_INCLUDE_DIR}/pybind11 DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
set(PYBIND11_CMAKECONFIG_INSTALL_DIR
"${CMAKE_INSTALL_DATAROOTDIR}/cmake/${PROJECT_NAME}"
CACHE STRING "install path for pybind11Config.cmake")
if(IS_ABSOLUTE "${CMAKE_INSTALL_INCLUDEDIR}")
set(pybind11_INCLUDEDIR "${CMAKE_INSTALL_FULL_INCLUDEDIR}")
else()
set(pybind11_INCLUDEDIR "\$\{PACKAGE_PREFIX_DIR\}/${CMAKE_INSTALL_INCLUDEDIR}")
endif()
configure_package_config_file(
tools/${PROJECT_NAME}Config.cmake.in "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
INSTALL_DESTINATION ${PYBIND11_CMAKECONFIG_INSTALL_DIR})
if(CMAKE_VERSION VERSION_LESS 3.14)
# Remove CMAKE_SIZEOF_VOID_P from ConfigVersion.cmake since the library does
# not depend on architecture specific settings or libraries.
set(_PYBIND11_CMAKE_SIZEOF_VOID_P ${CMAKE_SIZEOF_VOID_P})
unset(CMAKE_SIZEOF_VOID_P)
write_basic_package_version_file(
${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
VERSION ${PROJECT_VERSION}
COMPATIBILITY AnyNewerVersion)
set(CMAKE_SIZEOF_VOID_P ${_PYBIND11_CMAKE_SIZEOF_VOID_P})
else()
# CMake 3.14+ natively supports header-only libraries
write_basic_package_version_file(
${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
VERSION ${PROJECT_VERSION}
COMPATIBILITY AnyNewerVersion ARCH_INDEPENDENT)
endif()
install(
FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
tools/FindPythonLibsNew.cmake
tools/pybind11Common.cmake
tools/pybind11Tools.cmake
tools/pybind11NewTools.cmake
DESTINATION ${PYBIND11_CMAKECONFIG_INSTALL_DIR})
if(NOT PYBIND11_EXPORT_NAME)
set(PYBIND11_EXPORT_NAME "${PROJECT_NAME}Targets")
endif()
install(TARGETS pybind11_headers EXPORT "${PYBIND11_EXPORT_NAME}")
install(
EXPORT "${PYBIND11_EXPORT_NAME}"
NAMESPACE "pybind11::"
DESTINATION ${PYBIND11_CMAKECONFIG_INSTALL_DIR})
# pkg-config support
if(NOT prefix_for_pc_file)
set(prefix_for_pc_file "${CMAKE_INSTALL_PREFIX}")
endif()
join_paths(includedir_for_pc_file "\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}")
configure_file("${CMAKE_CURRENT_SOURCE_DIR}/tools/pybind11.pc.in"
"${CMAKE_CURRENT_BINARY_DIR}/pybind11.pc" @ONLY)
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/pybind11.pc"
DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/pkgconfig/")
# Uninstall target
if(PYBIND11_MASTER_PROJECT)
configure_file("${CMAKE_CURRENT_SOURCE_DIR}/tools/cmake_uninstall.cmake.in"
"${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake" IMMEDIATE @ONLY)
add_custom_target(uninstall COMMAND ${CMAKE_COMMAND} -P
${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)
endif()
endif()
# BUILD_TESTING takes priority, but only if this is the master project
if(PYBIND11_MASTER_PROJECT AND DEFINED BUILD_TESTING)
if(BUILD_TESTING)
if(_pybind11_nopython)
message(FATAL_ERROR "Cannot activate tests in NOPYTHON mode")
else()
add_subdirectory(tests)
endif()
endif()
else()
if(PYBIND11_TEST)
if(_pybind11_nopython)
message(FATAL_ERROR "Cannot activate tests in NOPYTHON mode")
else()
add_subdirectory(tests)
endif()
endif()
endif()
# Better symmetry with find_package(pybind11 CONFIG) mode.
if(NOT PYBIND11_MASTER_PROJECT)
set(pybind11_FOUND
TRUE
CACHE INTERNAL "True if pybind11 and all required components found on the system")
endif()
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