ffi: fix Py_DecodeLocale() signature

Closes PyO3#1766.
indygreg · Aug 8, 2021 · 709380d · 709380d
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fix incorrect calculation of `dictoffset` on 32-bit Windows. [#1475](https://github.com/PyO3/pyo3/pull/1475)
 - Fix regression in 0.13.2 leading to linking to incorrect Python library on Windows "gnu" targets. [#1759](https://github.com/PyO3/pyo3/pull/1759)
 - Fix compiler warning: deny trailing semicolons in expression macro. [#1762](https://github.com/PyO3/pyo3/pull/1762)
+- Fix incorrect FFI definition of `Py_DecodeLocale`. The 2nd argument is now `*mut Py_ssize_t` instead of `Py_ssize_t`. [#1766](https://github.com/PyO3/pyo3/pull/1766)
 
 ## [0.14.1] - 2021-07-04
 

diff --git a/src/ffi/sysmodule.rs b/src/ffi/sysmodule.rs
@@ -4,7 +4,7 @@ use libc::wchar_t;
 use std::os::raw::{c_char, c_int};
 
 extern "C" {
-    pub fn Py_DecodeLocale(arg1: *const c_char, arg2: Py_ssize_t) -> *mut wchar_t;
+    pub fn Py_DecodeLocale(arg1: *const c_char, arg2: *mut Py_ssize_t) -> *mut wchar_t;
     #[cfg_attr(PyPy, link_name = "PyPySys_GetObject")]
     pub fn PySys_GetObject(arg1: *const c_char) -> *mut PyObject;
     #[cfg_attr(PyPy, link_name = "PyPySys_SetObject")]