FindPython*: New implementation for Python stuff

Fixes: #16142

Tests/FindPython/CMakeLists.txt

@@ -0,0 +1,69 @@
+add_test(NAME FindPython.Python2 COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindPython/Python2"
+  "${CMake_BINARY_DIR}/Tests/FindPython/Python2"
+  ${build_generator_args}
+  --build-project TestPython2
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )
+
+add_test(NAME FindPython.Python2Fail COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindPython/Python2Fail"
+  "${CMake_BINARY_DIR}/Tests/FindPython/Python2Fail"
+  ${build_generator_args}
+  --build-project TestPython2Fail
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )
+set_tests_properties(FindPython.Python2Fail PROPERTIES
+  PASS_REGULAR_EXPRESSION "Could NOT find Python2 \\(missing: foobar\\)")
+
+add_test(NAME FindPython.Python3 COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindPython/Python3"
+  "${CMake_BINARY_DIR}/Tests/FindPython/Python3"
+  ${build_generator_args}
+  --build-project TestPython3
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )
+
+add_test(NAME FindPython.Python3Fail COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindPython/Python3Fail"
+  "${CMake_BINARY_DIR}/Tests/FindPython/Python3Fail"
+  ${build_generator_args}
+  --build-project TestPython3Fail
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )
+set_tests_properties(FindPython.Python3Fail PROPERTIES
+  PASS_REGULAR_EXPRESSION "Could NOT find Python3 \\(missing: foobar\\)")
+
+add_test(NAME FindPython.Python COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindPython/Python"
+  "${CMake_BINARY_DIR}/Tests/FindPython/Python"
+  ${build_generator_args}
+  --build-project TestPython
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )
+
+add_test(NAME FindPython.MultiplePackages COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindPython/MultiplePackages"
+  "${CMake_BINARY_DIR}/Tests/FindPython/MultiplePackages"
+  ${build_generator_args}
+  --build-project TestMultiplePackages
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )

Tests/FindPython/MultiplePackages/CMakeLists.txt

@@ -0,0 +1,33 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(TestMultiplePackages C)
+
+find_package (Python2 REQUIRED COMPONENTS Interpreter Development)
+find_package (Python3 REQUIRED COMPONENTS Interpreter Development)
+
+# Must find Python 3
+find_package (Python REQUIRED)
+
+if (NOT Python3_EXECUTABLE STREQUAL Python_EXECUTABLE)
+  message (FATAL_ERROR
+    "Python interpreters do not match:\n"
+    "  Python_EXECUTABLE='${Python_EXECUTABLE}'\n"
+    "  Python3_EXECUTABLE='${Python3_EXECUTABLE}'\n"
+    )
+endif()
+
+
+Python2_add_library (spam2 MODULE ../spam.c)
+target_compile_definitions (spam2 PRIVATE PYTHON2)
+
+Python3_add_library (spam3 MODULE ../spam.c)
+target_compile_definitions (spam3 PRIVATE PYTHON3)
+
+
+add_test (NAME python2_spam2
+          COMMAND "${CMAKE_COMMAND}" -E env "PYTHONPATH=$<TARGET_FILE_DIR:spam3>"
+          "${Python2_EXECUTABLE}" -c "import spam2; spam2.system(\"cd\")")
+
+add_test (NAME python3_spam3
+          COMMAND "${CMAKE_COMMAND}" -E env "PYTHONPATH=$<TARGET_FILE_DIR:spam3>"
+          "${Python3_EXECUTABLE}" -c "import spam3; spam3.system(\"cd\")")

Tests/FindPython/Python/CMakeLists.txt

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(TestPython C)
+
+include(CTest)
+
+find_package(Python 3 REQUIRED COMPONENTS Interpreter Development)
+if (NOT Python_FOUND)
+  message (FATAL_ERROR "Fail to found Python 3")
+endif()
+
+Python_add_library (spam3 MODULE ../spam.c)
+target_compile_definitions (spam3 PRIVATE PYTHON3)
+
+add_test (NAME python_spam3
+          COMMAND "${CMAKE_COMMAND}" -E env "PYTHONPATH=$<TARGET_FILE_DIR:spam3>"
+          "${Python_EXECUTABLE}" -c "import spam3; spam3.system(\"cd\")")

Tests/FindPython/Python2/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(TestPython2 C)
+
+include(CTest)
+
+find_package(Python2 3 QUIET)
+if (Python2_FOUND)
+  message (FATAL_ERROR "Wrong python version found: ${Python2_VERSION}")
+endif()
+
+find_package(Python2 REQUIRED COMPONENTS Interpreter Development)
+if (NOT Python2_FOUND)
+  message (FATAL_ERROR "Fail to found Python 2")
+endif()
+
+Python2_add_library (spam2 MODULE ../spam.c)
+target_compile_definitions (spam2 PRIVATE PYTHON2)
+
+add_test (NAME python2_spam2
+          COMMAND "${CMAKE_COMMAND}" -E env "PYTHONPATH=$<TARGET_FILE_DIR:spam2>"
+          "${Python2_EXECUTABLE}" -c "import spam2; spam2.system(\"cd\")")

Tests/FindPython/Python2Fail/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(TestPython2Fail C)
+
+include(CTest)
+
+find_package(Python2 REQUIRED COMPONENTS Interpreter Development foobar)
+
+Python2_add_library (spam2 MODULE ../spam.c)
+target_compile_definitions (spam2 PRIVATE PYTHON2)
+
+add_test (NAME python2_spam2
+          COMMAND "${CMAKE_COMMAND}" -E env "PYTHONPATH=$<TARGET_FILE_DIR:spam2>"
+          "${Python2_EXECUTABLE}" -c "import spam2; spam2.system(\"cd\")")

Tests/FindPython/Python3/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(TestPython3 C)
+
+include(CTest)
+
+find_package(Python3 2 QUIET)
+if (Python3_FOUND)
+  message (FATAL_ERROR "Wrong python version found: ${Python3_VERSION}")
+endif()
+
+find_package(Python3 REQUIRED COMPONENTS Interpreter Development)
+if (NOT Python3_FOUND)
+  message (FATAL_ERROR "Fail to found Python 3")
+endif()
+
+Python3_add_library (spam3 MODULE ../spam.c)
+target_compile_definitions (spam3 PRIVATE PYTHON3)
+
+add_test (NAME python3_spam3
+          COMMAND "${CMAKE_COMMAND}" -E env "PYTHONPATH=$<TARGET_FILE_DIR:spam3>"
+          "${Python3_EXECUTABLE}" -c "import spam3; spam3.system(\"cd\")")

Tests/FindPython/Python3Fail/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(TestPython3Fail C)
+
+include(CTest)
+
+find_package(Python3 REQUIRED COMPONENTS Interpreter Development foobar)
+
+Python3_add_library (spam3 MODULE ../spam.c)
+target_compile_definitions (spam3 PRIVATE PYTHON3)
+
+add_test (NAME python3_spam3
+          COMMAND "${CMAKE_COMMAND}" -E env "PYTHONPATH=$<TARGET_FILE_DIR:spam3>"
+          "${Python3_EXECUTABLE}" -c "import spam3; spam3.system(\"cd\")")

Tests/FindPython/spam.c

@@ -0,0 +1,41 @@
+
+#include <Python.h>
+
+static PyObject* spam_system(PyObject* self, PyObject* args)
+{
+  const char* command;
+  int sts;
+
+  if (!PyArg_ParseTuple(args, "s", &command))
+    return NULL;
+  sts = system(command);
+  /* return PyLong_FromLong(sts); */
+  return Py_BuildValue("i", sts);
+}
+
+static PyMethodDef SpamMethods[] = {
+  { "system", spam_system, METH_VARARGS, "Execute a shell command." },
+  { NULL, NULL, 0, NULL } /* Sentinel */
+};
+
+#if defined(PYTHON2)
+PyMODINIT_FUNC initspam2(void)
+{
+  (void)Py_InitModule("spam2", SpamMethods);
+}
+#endif
+
+#if defined(PYTHON3)
+static struct PyModuleDef spammodule = {
+  PyModuleDef_HEAD_INIT, "spam3", /* name of module */
+  NULL,                           /* module documentation, may be NULL */
+  -1, /* size of per-interpreter state of the module,
+         or -1 if the module keeps state in global variables. */
+  SpamMethods
+};
+
+PyMODINIT_FUNC PyInit_spam3(void)
+{
+  return PyModule_Create(&spammodule);
+}
+#endif