♻️ replace Python.cmake

Signed-off-by: burgholzer <burgholzer@me.com>

CMakeLists.txt

@@ -19,8 +19,22 @@ if(BUILD_MQT_CORE_BINDINGS)
   set(BINDINGS
       ON
       CACHE INTERNAL "Enable settings related to Python bindings")
-  include(cmake/Python.cmake)
-  find_python()
+  # Some common settings for finding Python
+  set(Python_FIND_VIRTUALENV
+      FIRST
+      CACHE STRING "Give precedence to virtualenvs when searching for Python")
+  set(Python_FIND_FRAMEWORK
+      LAST
+      CACHE STRING "Prefer Brew/Conda to Apple framework Python")
+  set(Python_ARTIFACTS_INTERACTIVE
+      ON
+      CACHE BOOL "Prevent multiple searches for Python and instead cache the results.")
+
+  # top-level call to find Python
+  find_package(
+    Python 3.8 REQUIRED
+    COMPONENTS Interpreter Development.Module
+    OPTIONAL_COMPONENTS Development.SABIModule)
 endif()
 
 # check if this is the master project or used via add_subdirectory

cmake/ExternalDependencies.cmake

@@ -4,6 +4,22 @@ include(FetchContent)
 include(CMakeDependentOption)
 set(FETCH_PACKAGES "")
 
+if(BUILD_MQT_CORE_BINDINGS)
+  if(NOT SKBUILD)
+    # Manually detect the installed pybind11 package and import it into CMake.
+    execute_process(
+      COMMAND "${Python_EXECUTABLE}" -m pybind11 --cmakedir
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+      OUTPUT_VARIABLE pybind11_DIR)
+    list(APPEND CMAKE_PREFIX_PATH "${pybind11_DIR}")
+  endif()
+
+  message(STATUS "Python executable: ${Python_EXECUTABLE}")
+
+  # add pybind11 library
+  find_package(pybind11 CONFIG REQUIRED)
+endif()
+
 set(JSON_VERSION
     3.11.3
     CACHE STRING "nlohmann_json version")