FindPython*: Manage weak link for Python modules

Add new target Python::Module which take care of platform requirements
for Python module development.

Fixes: #18100

9 files changed, 134 insertions, 0 deletions

diff --git a/Tests/FindPython/CMakeLists.txt b/Tests/FindPython/CMakeLists.txt
index d6f50e7..8dfcf40 100644
--- a/Tests/FindPython/CMakeLists.txt
+++ b/Tests/FindPython/CMakeLists.txt
@@ -79,6 +79,28 @@ if(CMake_TEST_FindPython)
     --build-options ${build_options}
     --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
     )
+
+  add_test(NAME FindPython.Python2Embedded COMMAND
+    ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+    --build-and-test
+    "${CMake_SOURCE_DIR}/Tests/FindPython/Python2Embedded"
+    "${CMake_BINARY_DIR}/Tests/FindPython/Python2Embedded"
+    ${build_generator_args}
+    --build-project TestPython2Embedded
+    --build-options ${build_options}
+    --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+    )
+  add_test(NAME FindPython.Python3Embedded COMMAND
+    ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+    --build-and-test
+    "${CMake_SOURCE_DIR}/Tests/FindPython/Python3Embedded"
+    "${CMake_BINARY_DIR}/Tests/FindPython/Python3Embedded"
+    ${build_generator_args}
+    --build-project TestPython3Embedded
+    --build-options ${build_options}
+    --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+    )
+
 endif()
 
 if(CMake_TEST_FindPython_NumPy)
diff --git a/Tests/FindPython/Python/CMakeLists.txt b/Tests/FindPython/Python/CMakeLists.txt
index f7fc243..62c805e 100644
--- a/Tests/FindPython/Python/CMakeLists.txt
+++ b/Tests/FindPython/Python/CMakeLists.txt
@@ -16,6 +16,9 @@ endif()
 if(NOT TARGET Python::Python)
   message(SEND_ERROR "Python::Python not found")
 endif()
+if(NOT TARGET Python::Module)
+  message(SEND_ERROR "Python::Module not found")
+endif()
 
 Python_add_library (spam3 MODULE ../spam.c)
 target_compile_definitions (spam3 PRIVATE PYTHON3)
diff --git a/Tests/FindPython/Python2/CMakeLists.txt b/Tests/FindPython/Python2/CMakeLists.txt
index a0753f6..274745a 100644
--- a/Tests/FindPython/Python2/CMakeLists.txt
+++ b/Tests/FindPython/Python2/CMakeLists.txt
@@ -21,6 +21,9 @@ endif()
 if(NOT TARGET Python2::Python)
   message(SEND_ERROR "Python2::Python not found")
 endif()
+if(NOT TARGET Python2::Module)
+  message(SEND_ERROR "Python2::Module not found")
+endif()
 
 Python2_add_library (spam2 MODULE ../spam.c)
 target_compile_definitions (spam2 PRIVATE PYTHON2)
diff --git a/Tests/FindPython/Python2Embedded/CMakeLists.txt b/Tests/FindPython/Python2Embedded/CMakeLists.txt
new file mode 100644
index 0000000..0115dea
--- /dev/null
+++ b/Tests/FindPython/Python2Embedded/CMakeLists.txt
@@ -0,0 +1,29 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(TestPython2Embedded C)
+
+include(CTest)
+
+find_package(Python2 REQUIRED COMPONENTS Development)
+if (NOT Python2_FOUND)
+  message (FATAL_ERROR "Fail to found Python 2")
+endif()
+
+if(NOT TARGET Python2::Python)
+  message(SEND_ERROR "Python2::Python not found")
+endif()
+
+Python2_add_library (display_time2 SHARED ../display_time.c)
+set_property (TARGET display_time2 PROPERTY WINDOWS_EXPORT_ALL_SYMBOLS ON)
+target_compile_definitions (display_time2 PRIVATE PYTHON2)
+
+add_executable (main2 ../main.c)
+target_link_libraries (main2 PRIVATE display_time2)
+
+if (WIN32 OR CYGWIN OR MSYS OR MINGW)
+  list (JOIN Python2_RUNTIME_LIBRARY_DIRS "$<SEMICOLON>" RUNTIME_DIRS)
+  add_test (NAME Python2.Embedded COMMAND "${CMAKE_COMMAND}" -E env "PATH=${RUNTIME_DIRS}" $<TARGET_FILE:main2>)
+else()
+  add_test (NAME Python2.Embedded COMMAND main2)
+endif()
+set_property (TEST Python2.Embedded PROPERTY PASS_REGULAR_EXPRESSION "Today is")
diff --git a/Tests/FindPython/Python3/CMakeLists.txt b/Tests/FindPython/Python3/CMakeLists.txt
index 65eea4c..b21a15b 100644
--- a/Tests/FindPython/Python3/CMakeLists.txt
+++ b/Tests/FindPython/Python3/CMakeLists.txt
@@ -21,6 +21,9 @@ endif()
 if(NOT TARGET Python3::Python)
   message(SEND_ERROR "Python2::Python not found")
 endif()
+if(NOT TARGET Python3::Module)
+  message(SEND_ERROR "Python2::Module not found")
+endif()
 
 Python3_add_library (spam3 MODULE ../spam.c)
 target_compile_definitions (spam3 PRIVATE PYTHON3)
diff --git a/Tests/FindPython/Python3Embedded/CMakeLists.txt b/Tests/FindPython/Python3Embedded/CMakeLists.txt
new file mode 100644
index 0000000..4eb7ebc
--- /dev/null
+++ b/Tests/FindPython/Python3Embedded/CMakeLists.txt
@@ -0,0 +1,29 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(TestPython3Embedded C)
+
+include(CTest)
+
+find_package(Python3 REQUIRED COMPONENTS Development)
+if (NOT Python3_FOUND)
+  message (FATAL_ERROR "Fail to found Python 3")
+endif()
+
+if(NOT TARGET Python3::Python)
+  message(SEND_ERROR "Python3::Python not found")
+endif()
+
+Python3_add_library (display_time3 SHARED ../display_time.c)
+set_property (TARGET display_time3 PROPERTY WINDOWS_EXPORT_ALL_SYMBOLS ON)
+target_compile_definitions (display_time3 PRIVATE PYTHON3)
+
+add_executable (main3 ../main.c)
+target_link_libraries (main3 PRIVATE display_time3)
+
+if (WIN32 OR CYGWIN OR MSYS OR MINGW)
+  list (JOIN Python3_RUNTIME_LIBRARY_DIRS "$<SEMICOLON>" RUNTIME_DIRS)
+  add_test (NAME Python3.Embedded COMMAND "${CMAKE_COMMAND}" -E env "PATH=${RUNTIME_DIRS}" $<TARGET_FILE:main3>)
+else()
+  add_test (NAME Python3.Embedded COMMAND main3)
+endif()
+set_property (TEST Python3.Embedded PROPERTY PASS_REGULAR_EXPRESSION "Today is")
diff --git a/Tests/FindPython/display_time.c b/Tests/FindPython/display_time.c
new file mode 100644
index 0000000..0e78434
--- /dev/null
+++ b/Tests/FindPython/display_time.c
@@ -0,0 +1,36 @@
+
+#include <stdio.h>
+
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+
+#include "display_time.h"
+
+void display_time()
+{
+#if defined(PYTHON3)
+  wchar_t* program = Py_DecodeLocale("display_time", NULL);
+  if (program == NULL) {
+    fprintf(stderr, "Fatal error: cannot decode argv[0]\n");
+    exit(1);
+  }
+  char* cmd = "from time import time,ctime\n"
+              "print('Today is', ctime(time()))\n";
+#else
+  char* program = "display_time";
+  char* cmd = "from time import time,ctime\n"
+              "print 'Today is', ctime(time())\n";
+#endif
+
+  Py_SetProgramName(program); /* optional but recommended */
+  Py_Initialize();
+  PyRun_SimpleString(cmd);
+#if defined(PYTHON3)
+  if (Py_FinalizeEx() < 0) {
+    exit(120);
+  }
+  PyMem_RawFree(program);
+#else
+  Py_Finalize();
+#endif
+}
diff --git a/Tests/FindPython/display_time.h b/Tests/FindPython/display_time.h
new file mode 100644
index 0000000..d825e02
--- /dev/null
+++ b/Tests/FindPython/display_time.h
@@ -0,0 +1,2 @@
+
+void display_time();
diff --git a/Tests/FindPython/main.c b/Tests/FindPython/main.c
new file mode 100644
index 0000000..0acba29
--- /dev/null
+++ b/Tests/FindPython/main.c
@@ -0,0 +1,7 @@
+
+#include "display_time.h"
+
+int main()
+{
+  display_time();
+}