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GeezerVison is showing github.com — CYGWIN: Python-3.16.0a1 doesn't select correct strerror_r() · Issue #161198 · python/cpython

CYGWIN: Python-3.16.0a1 doesn't select correct strerror_r() #161198

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CYGWIN: Python-3.16.0a1 doesn't select correct strerror_r()#161198
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OS-unsupportedOS-windowsbuildThe build process and cross-buildThe build process and cross-buildtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

@carlo-bramini
carlo-bramini
opened on Nov 2, 2026
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Bug report

Python-3.16.0a1 has been released, so I tried to build it on Cygwin.
Unfortunately, this error happens:

Python-3.16.0a1/Python/fileutils.c: In function ‘_Py_strerror’:
Python-3.16.0a1/Python/fileutils.c:3353:15: error: initialization of ‘int’ from ‘char *’ makes integer from pointer without a cast [-Wint-conversion]
 3353 |     int len = strerror_r(code, small_buffer, buflen);
      |               ^~~~~~~~~~
Python-3.16.0a1/Python/fileutils.c:3373:17: error: assignment to ‘int’ from ‘char *’ makes integer from pointer without a cast [-Wint-conversion]
 3373 |             len = strerror_r(code, buffer, buflen);
      |                 ^
make: *** [Makefile:3361: Python/fileutils.o] Error 1

I'm thinking that this error comes from a recent change because I had not it in the past builds.
Evidently, Cygwin is also using the GNU version of strerror_r() but the current code doesn't take care of it.
At the moment, I fixed the error with this change:

--- origsrc/Python-3.16.0a1/Python/fileutils.c	2026-10-13 17:05:54.000000000 +0200
+++ src/Python-3.16.0a1/Python/fileutils.c	2026-11-02 13:13:18.366198700 +0100
@@ -3319,7 +3319,7 @@ _Py_strerror(int code)
    // Check which strerror_r() API is used
 #  if defined(__GLIBC__) && !((_POSIX_C_SOURCE >= 200112L) && !defined(_GNU_SOURCE))
 #    define Py_STRERROR_R_GNU
-#  elif defined(__ANDROID__) && defined(_GNU_SOURCE)
+#  elif (defined(__ANDROID__) || defined(__CYGWIN__)) && defined(_GNU_SOURCE)
 #    define Py_STRERROR_R_GNU
 #  endif
 #endif

However, is there a special reason because this test is not done at configure time?
Any comments?
See also issue #149879 "Enhance Cygwin support".

CPython versions tested on:

3.16

Operating systems tested on:

Windows

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  1. carlo-bramini
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on Nov 2, 2026
  2. aisk
    added
    OS-windows
    OS-unsupported
    on Nov 2, 2026
  3. github-project-automation
    added this to Unsupported platformson Nov 2, 2026
  4. aisk
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    buildThe build process and cross-buildThe build process and cross-build
    on Nov 2, 2026
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