bpo-38304: PyConfig_InitPythonConfig() cannot fail anymore (GH-16509)

PyConfig_InitPythonConfig() and PyConfig_InitIsolatedConfig() no
longer return PyStatus: they cannot fail anymore.

Author: vstinner

Doc/c-api/init_config.rst

@@ -343,12 +343,12 @@ PyConfig
 
    Structure methods:
 
-   .. c:function:: PyStatus PyConfig_InitPythonConfig(PyConfig *config)
+   .. c:function:: void PyConfig_InitPythonConfig(PyConfig *config)
 
       Initialize configuration with :ref:`Python Configuration
       <init-python-config>`.
 
-   .. c:function:: PyStatus PyConfig_InitIsolatedConfig(PyConfig *config)
+   .. c:function:: void PyConfig_InitIsolatedConfig(PyConfig *config)
 
       Initialize configuration with :ref:`Isolated Configuration
       <init-isolated-conf>`.
@@ -724,12 +724,9 @@ Example setting the program name::
     void init_python(void)
     {
         PyStatus status;
-        PyConfig config;
 
-        status = PyConfig_InitPythonConfig(&config);
-        if (PyStatus_Exception(status)) {
-            goto fail;
-        }
+        PyConfig config;
+        PyConfig_InitPythonConfig(&config);
 
         /* Set the program name. Implicitly preinitialize Python. */
         status = PyConfig_SetString(&config, &config.program_name,
@@ -756,12 +753,9 @@ configuration, and then override some parameters::
     PyStatus init_python(const char *program_name)
     {
         PyStatus status;
-        PyConfig config;
 
-        status = PyConfig_InitPythonConfig(&config);
-        if (PyStatus_Exception(status)) {
-            goto done;
-        }
+        PyConfig config;
+        PyConfig_InitPythonConfig(&config);
 
         /* Set the program name before reading the configuraton
            (decode byte string from the locale encoding).
@@ -843,13 +837,9 @@ Example of customized Python always running in isolated mode::
     int main(int argc, char **argv)
     {
         PyStatus status;
-        PyConfig config;
-
-        status = PyConfig_InitPythonConfig(&config);
-        if (PyStatus_Exception(status)) {
-            goto fail;
-        }
 
+        PyConfig config;
+        PyConfig_InitPythonConfig(&config);
         config.isolated = 1;
 
         /* Decode command line arguments.
@@ -1034,14 +1024,9 @@ phases::
     void init_python(void)
     {
         PyStatus status;
-        PyConfig config;
-
-        status = PyConfig_InitPythonConfig(&config);
-        if (PyStatus_Exception(status)) {
-            PyConfig_Clear(&config);
-            Py_ExitStatusException(status);
-        }
 
+        PyConfig config;
+        PyConfig_InitPythonConfig(&config);
         config._init_main = 0;
 
         /* ... customize 'config' configuration ... */

Include/cpython/initconfig.h

@@ -404,8 +404,8 @@ typedef struct {
     int _init_main;
 } PyConfig;
 
-PyAPI_FUNC(PyStatus) PyConfig_InitPythonConfig(PyConfig *config);
-PyAPI_FUNC(PyStatus) PyConfig_InitIsolatedConfig(PyConfig *config);
+PyAPI_FUNC(void) PyConfig_InitPythonConfig(PyConfig *config);
+PyAPI_FUNC(void) PyConfig_InitIsolatedConfig(PyConfig *config);
 PyAPI_FUNC(void) PyConfig_Clear(PyConfig *);
 PyAPI_FUNC(PyStatus) PyConfig_SetString(
     PyConfig *config,

Include/internal/pycore_initconfig.h

@@ -144,7 +144,7 @@ typedef enum {
     _PyConfig_INIT_ISOLATED = 3
 } _PyConfigInitEnum;
 
-PyAPI_FUNC(PyStatus) _PyConfig_InitCompatConfig(PyConfig *config);
+PyAPI_FUNC(void) _PyConfig_InitCompatConfig(PyConfig *config);
 extern PyStatus _PyConfig_Copy(
     PyConfig *config,
     const PyConfig *config2);

Modules/main.c

@@ -61,11 +61,7 @@ pymain_init(const _PyArgv *args)
     }
 
     PyConfig config;
-
-    status = PyConfig_InitPythonConfig(&config);
-    if (_PyStatus_EXCEPTION(status)) {
-        goto done;
-    }
+    PyConfig_InitPythonConfig(&config);
 
     /* pass NULL as the config: config is read from command line arguments,
        environment variables, configuration files */

PC/python_uwp.cpp

@@ -193,10 +193,7 @@ wmain(int argc, wchar_t **argv)
         }
     }
 
-    status = PyConfig_InitPythonConfig(&config);
-    if (PyStatus_Exception(status)) {
-        goto fail_without_config;
-    }
+    PyConfig_InitPythonConfig(&config);
 
     status = PyConfig_SetArgv(&config, argc, argv);
     if (PyStatus_Exception(status)) {

Programs/_freeze_importlib.c

@@ -76,17 +76,12 @@ main(int argc, char *argv[])
     }
     text[text_size] = '\0';
 
-    PyStatus status;
     PyConfig config;
-
-    status = PyConfig_InitIsolatedConfig(&config);
-    if (PyStatus_Exception(status)) {
-        PyConfig_Clear(&config);
-        Py_ExitStatusException(status);
-    }
+    PyConfig_InitIsolatedConfig(&config);
 
     config.site_import = 0;
 
+    PyStatus status;
     status = PyConfig_SetString(&config, &config.program_name,
                                 L"./_freeze_importlib");
     if (PyStatus_Exception(status)) {