bpo-36763: PyConfig_Read() handles PySys_AddXOption() (GH-15431)

PyConfig_Read() is now responsible to handle early calls to
PySys_AddXOption() and PySys_AddWarnOption().

Options added by PySys_AddXOption() are now handled the same way than
PyConfig.xoptions and command line -X options.

For example, PySys_AddXOption(L"faulthandler") enables faulthandler
as expected.

1 files changed, 49 insertions, 0 deletions

diff --git a/Programs/_testembed.c b/Programs/_testembed.c
index 38730095dab..c3ccc0ec325 100644
--- a/Programs/_testembed.c
+++ b/Programs/_testembed.c
@@ -1375,6 +1375,54 @@ fail:
 }
 
 
+static int test_init_sys_add(void)
+{
+    PySys_AddXOption(L"sysadd_xoption");
+    PySys_AddXOption(L"faulthandler");
+    PySys_AddWarnOption(L"ignore:::sysadd_warnoption");
+
+    PyConfig config;
+    PyStatus status;
+    status = PyConfig_InitPythonConfig(&config);
+    if (PyStatus_Exception(status)) {
+        goto fail;
+    }
+
+    wchar_t* argv[] = {
+        L"python3",
+        L"-W",
+        L"ignore:::cmdline_warnoption",
+        L"-X",
+        L"cmdline_xoption",
+    };
+    config_set_argv(&config, Py_ARRAY_LENGTH(argv), argv);
+    config.parse_argv = 1;
+
+    status = PyWideStringList_Append(&config.xoptions,
+                                     L"config_xoption");
+    if (PyStatus_Exception(status)) {
+        goto fail;
+    }
+
+    status = PyWideStringList_Append(&config.warnoptions,
+                                     L"ignore:::config_warnoption");
+    if (PyStatus_Exception(status)) {
+        goto fail;
+    }
+
+    config_set_program_name(&config);
+    init_from_config_clear(&config);
+
+    dump_config();
+    Py_Finalize();
+    return 0;
+
+fail:
+    PyConfig_Clear(&config);
+    Py_ExitStatusException(status);
+}
+
+
 static void configure_init_main(PyConfig *config)
 {
     wchar_t* argv[] = {
@@ -1510,6 +1558,7 @@ static struct TestCase TestCases[] = {
     {"test_init_read_set", test_init_read_set},
     {"test_init_run_main", test_init_run_main},
     {"test_init_main", test_init_main},
+    {"test_init_sys_add", test_init_sys_add},
     {"test_run_main", test_run_main},
     {"test_open_code_hook", test_open_code_hook},
     {"test_audit", test_audit},