Test also the internal C API in test_cppext

Author: vstinner

Lib/test/test_cppext/__init__.py

@@ -24,7 +24,7 @@
 @support.requires_venv_with_pip()
 @support.requires_subprocess()
 @support.requires_resource('cpu')
-class TestCPPExt(unittest.TestCase):
+class BaseTests:
     def test_build(self):
         self.check_build('_testcppext')
 
@@ -34,10 +34,6 @@ def test_build_cpp03(self):
         # Please ask the C API WG before adding a new C++11-only feature.
         self.check_build('_testcpp03ext', std='c++03')
 
-    @support.requires_gil_enabled('incompatible with Free Threading')
-    def test_build_limited_cpp03(self):
-        self.check_build('_test_limited_cpp03ext', std='c++03', limited=True)
-
     @unittest.skipIf(support.MS_WINDOWS, "MSVC doesn't support /std:c++11")
     def test_build_cpp11(self):
         self.check_build('_testcpp11ext', std='c++11')
@@ -48,10 +44,6 @@ def test_build_cpp11(self):
     def test_build_cpp14(self):
         self.check_build('_testcpp14ext', std='c++14')
 
-    @support.requires_gil_enabled('incompatible with Free Threading')
-    def test_build_limited(self):
-        self.check_build('_testcppext_limited', limited=True)
-
     def check_build(self, extension_name, std=None, limited=False):
         venv_dir = 'env'
         with support.setup_venv_with_pip_setuptools(venv_dir) as python_exe:
@@ -111,5 +103,19 @@ def run_cmd(operation, cmd):
         run_cmd('Import', cmd)
 
 
+class TestPublicCAPI(BaseTests, unittest.TestCase):
+    @support.requires_gil_enabled('incompatible with Free Threading')
+    def test_build_limited_cpp03(self):
+        self.check_build('_test_limited_cpp03ext', std='c++03', limited=True)
+
+    @support.requires_gil_enabled('incompatible with Free Threading')
+    def test_build_limited(self):
+        self.check_build('_testcppext_limited', limited=True)
+
+
+class TestInteralCAPI(BaseTests, unittest.TestCase):
+    TEST_INTERNAL_C_API = True
+
+
 if __name__ == "__main__":
     unittest.main()

Lib/test/test_cppext/extension.cpp

@@ -6,8 +6,17 @@
 // Always enable assertions
 #undef NDEBUG
 
+#ifdef TEST_INTERNAL_C_API
+#  define Py_BUILD_CORE 1
+#endif
+
 #include "Python.h"
 
+#ifdef TEST_INTERNAL_C_API
+   // gh-135906: Check for compiler warnings in the internal C API
+#  include "internal/pycore_frame.h"
+#endif
+
 #ifndef MODULE_NAME
 #  error "MODULE_NAME macro must be defined"
 #endif

Lib/test/test_cppext/setup.py

@@ -47,6 +47,7 @@ def main():
     std = os.environ.get("CPYTHON_TEST_CPP_STD", "")
     module_name = os.environ["CPYTHON_TEST_EXT_NAME"]
     limited = bool(os.environ.get("CPYTHON_TEST_LIMITED", ""))
+    internal = bool(int(os.environ.get("TEST_INTERNAL_C_API", "0")))
 
     cppflags = list(CPPFLAGS)
     cppflags.append(f'-DMODULE_NAME={module_name}')
@@ -82,6 +83,9 @@ def main():
         version = sys.hexversion
         cppflags.append(f'-DPy_LIMITED_API={version:#x}')
 
+    if internal:
+        cppflags.append('-DTEST_INTERNAL_C_API=1')
+
     # On Windows, add PCbuild\amd64\ to include and library directories
     include_dirs = []
     library_dirs = []