python: use built-in CMake FindPython module from CMake 3.12 or higher

cmake/FindPython.cmake

@@ -1,36 +0,0 @@
-#
-# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
-# SPDX-FileCopyrightText: 2009 Julien Louis <ptitlouis@sysif.net>
-#
-# SPDX-License-Identifier: GPL-3.0-or-later
-#
-# This file is part of WeeChat, the extensible chat client.
-#
-# WeeChat is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
-#
-# WeeChat is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with WeeChat.  If not, see <https://www.gnu.org/licenses/>.
-#
-
-# - Find Python
-# This module finds if Python is installed and determines where the include files
-# and libraries are. It also determines what the name of the library is. This
-# code sets the following variables:
-#
-#  PYTHON_EXECUTABLE   = full path to the python binary
-#  PYTHON_INCLUDE_DIRS = path to where python.h can be found
-#  PYTHON_LIBRARIES = path to where libpython.so* can be found
-#  PYTHON_LDFLAGS = python compiler options for linking
-
-pkg_check_modules(PYTHON python3-embed IMPORTED_TARGET GLOBAL)
-if(NOT PYTHON_FOUND)
-  pkg_check_modules(PYTHON python3 IMPORTED_TARGET GLOBAL)
-endif()

src/plugins/CMakeLists.txt

@@ -124,8 +124,12 @@ else()
 endif()
 
 if(ENABLE_SCRIPTS AND ENABLE_PYTHON)
-  find_package(Python)
-  if(PYTHON_FOUND)
+  if(CMAKE_VERSION VERSION_LESS "3.18.0")
+    find_package(Python 3.0 COMPONENTS Development)
+  else()
+    find_package(Python 3.0 COMPONENTS Development.Embed)
+  endif()
+  if(Python_FOUND)
     add_subdirectory(python)
   else()
     message(SEND_ERROR "Python not found")

src/plugins/python/CMakeLists.txt

@@ -25,8 +25,10 @@ add_library(python MODULE
 )
 set_target_properties(python PROPERTIES PREFIX "")
 
-if(PYTHON_FOUND)
-  target_link_libraries(python PkgConfig::PYTHON weechat_plugins_scripts coverage_config)
+if(Python_FOUND)
+  include_directories(${Python_INCLUDE_DIRS})
+  add_definitions(${Python_DEFINITIONS})
+  target_link_libraries(python ${Python_LIBRARIES} weechat_plugins_scripts coverage_config)
 endif()
 
 install(TARGETS python LIBRARY DESTINATION "${WEECHAT_LIBDIR}/plugins")