Backport XCode 27 support to 3.14 (#3545)

* Upstream fix (3.14.7): 51f6e01941 * Dependency patch (3.14.6): e29411d405 * Test on XCode 27
2026-10-02 23:41:06 +09:00 · 2026-09-16 20:39:57 +03:00 · 2026-09-16 20:39:57 +03:00 · 8bd6b02444
commit 8bd6b02444
parent 676b71e7b5
14 changed files with 1339 additions and 0 deletions
--- a/.github/workflows/modified_scripts_build.yml
+++ b/.github/workflows/modified_scripts_build.yml
@ -96,6 +96,7 @@ jobs:
          - macos-15-intel
          - macos-26
          - macos-26-intel
          - xcode-27
        exclude: ${{fromJson(needs.discover_modified_scripts.outputs.versions_macos_build_exclude)}}
    runs-on: ${{ matrix.os }}
    steps:
@ -164,6 +165,7 @@ jobs:
          - macos-15-intel
          - macos-26
          - macos-26-intel
          - xcode-27
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v7
--- a/plugins/python-build/share/python-build/patches/3.14.0/Python-3.14.0/0003-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.0/Python-3.14.0/0003-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
@ -0,0 +1,105 @@
 From bf2d8d5a2c8fd2e0c5b4368ea7180c57971bc156 Mon Sep 17 00:00:00 2001
 From: Russell Keith-Magee <russell@keith-magee.com>
 Date: Tue, 26 May 2026 13:07:16 +0800
 Subject: [PATCH] [3.14] gh-150443: Exclude explicit dup3 and pipe2 checks on
 iOS builds. (GH-150444) (#150447)
 Exclude explicit dup3 and pipe2 checks on iOS builds.
 (cherry picked from commit 629da5c914b4407e01c1dc06cbcbd8dce825fef3)
 ---
 configure    | 26 +++++++++++++-------------
 configure.ac |  6 +++---
 2 files changed, 16 insertions(+), 16 deletions(-)
 diff --git a/configure b/configure
 index d31c24dffa2..29190f296af 100755
 --- a/configure
 +++ b/configure
@@ -19250,12 +19250,6 @@ if test "x$ac_cv_func_dup" = xyes
 then :
   printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
 if test "x$ac_cv_func_execv" = xyes
@@ -19730,12 +19724,6 @@ if test "x$ac_cv_func_pipe" = xyes
 then :
   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
 if test "x$ac_cv_func_plock" = xyes
@@ -20381,7 +20369,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20392,6 +20386,12 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
 diff --git a/configure.ac b/configure.ac
 index af7a9623d7b..4c5bf12cc50 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5214,7 +5214,7 @@ fi
 # checks for library functions
 AC_CHECK_FUNCS([ \
   accept4 alarm bind_textdomain_codeset chmod chown clock closefrom close_range confstr \
 -  copy_file_range ctermid dladdr dup dup3 execv explicit_bzero explicit_memset \
 +  copy_file_range ctermid dladdr dup execv explicit_bzero explicit_memset \
   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
   gai_strerror getegid geteuid getgid getgrent getgrgid getgrgid_r \
@@ -5224,7 +5224,7 @@ AC_CHECK_FUNCS([ \
   getspnam getuid getwd grantpt if_nameindex initgroups kill killpg lchown linkat \
   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
 -  pipe2 plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
 +  plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
   posix_spawn_file_actions_addclosefrom_np \
   pread preadv preadv2 process_vm_readv \
   pthread_cond_timedwait_relative_np pthread_condattr_setclock pthread_init \
@@ -5255,7 +5255,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([getentropy getgroups system])
 +  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.0/Python-3.14.0/0004-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.0/Python-3.14.0/0004-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
@ -0,0 +1,101 @@
 From b871bbe60698c7a6bb6409cf4c091088e119eeb3 Mon Sep 17 00:00:00 2001
 From: Ned Deily <nad@python.org>
 Date: Wed, 5 Aug 2026 00:27:28 -0700
 Subject: [PATCH] [3.14] gh-153711: Avoid use of dup3 and pipe2 calls
 introduced in macOS 27 (#155206)
 ---
 ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
 configure                                     | 32 +++++++++++--------
 configure.ac                                  |  8 ++++-
 3 files changed, 29 insertions(+), 14 deletions(-)
 create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 new file mode 100644
 index 00000000000..90804c179a4
 --- /dev/null
 +++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
@@ -0,0 +1,3 @@
 +On macOS, do not attempt to use the :manpage:`dup3(2)` and
 +:manpage:`pipe2(2)` system calls introduced in
 +macOS 27 to prevent problems when running on older systems.
 diff --git a/configure b/configure
 index 29190f296af..2217e59d15f 100755
 --- a/configure
 +++ b/configure
@@ -20369,13 +20369,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 -fi
 -ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20386,12 +20380,6 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
@@ -20400,6 +20388,24 @@ then :
 fi
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 +fi
 +
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
 diff --git a/configure.ac b/configure.ac
 index 4c5bf12cc50..4ad84af4d17 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5255,7 +5255,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 +  AC_CHECK_FUNCS([getentropy getgroups system])
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  AC_CHECK_FUNCS([dup3 pipe2])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.1/Python-3.14.1/0002-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.1/Python-3.14.1/0002-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
@ -0,0 +1,105 @@
 From bc2b13dee7629b9c86dc53106311fe26de1a98a5 Mon Sep 17 00:00:00 2001
 From: Russell Keith-Magee <russell@keith-magee.com>
 Date: Tue, 26 May 2026 13:07:16 +0800
 Subject: [PATCH] [3.14] gh-150443: Exclude explicit dup3 and pipe2 checks on
 iOS builds. (GH-150444) (#150447)
 Exclude explicit dup3 and pipe2 checks on iOS builds.
 (cherry picked from commit 629da5c914b4407e01c1dc06cbcbd8dce825fef3)
 ---
 configure    | 26 +++++++++++++-------------
 configure.ac |  6 +++---
 2 files changed, 16 insertions(+), 16 deletions(-)
 diff --git a/configure b/configure
 index 46eb0665bf4..3f138a8ff11 100755
 --- a/configure
 +++ b/configure
@@ -19281,12 +19281,6 @@ if test "x$ac_cv_func_dup" = xyes
 then :
   printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
 if test "x$ac_cv_func_execv" = xyes
@@ -19761,12 +19755,6 @@ if test "x$ac_cv_func_pipe" = xyes
 then :
   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
 if test "x$ac_cv_func_plock" = xyes
@@ -20412,7 +20400,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20423,6 +20417,12 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
 diff --git a/configure.ac b/configure.ac
 index bd4446e9488..9fdb671d44d 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5239,7 +5239,7 @@ fi
 # checks for library functions
 AC_CHECK_FUNCS([ \
   accept4 alarm bind_textdomain_codeset chmod chown clock closefrom close_range confstr \
 -  copy_file_range ctermid dladdr dup dup3 execv explicit_bzero explicit_memset \
 +  copy_file_range ctermid dladdr dup execv explicit_bzero explicit_memset \
   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
   gai_strerror getegid geteuid getgid getgrent getgrgid getgrgid_r \
@@ -5249,7 +5249,7 @@ AC_CHECK_FUNCS([ \
   getspnam getuid getwd grantpt if_nameindex initgroups kill killpg lchown linkat \
   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
 -  pipe2 plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
 +  plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
   posix_spawn_file_actions_addclosefrom_np \
   pread preadv preadv2 process_vm_readv \
   pthread_cond_timedwait_relative_np pthread_condattr_setclock pthread_init \
@@ -5280,7 +5280,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([getentropy getgroups system])
 +  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.1/Python-3.14.1/0003-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.1/Python-3.14.1/0003-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
@ -0,0 +1,101 @@
 From 2d7a52cf26a57b14fde53897d782db55e63fb356 Mon Sep 17 00:00:00 2001
 From: Ned Deily <nad@python.org>
 Date: Wed, 5 Aug 2026 00:27:28 -0700
 Subject: [PATCH] [3.14] gh-153711: Avoid use of dup3 and pipe2 calls
 introduced in macOS 27 (#155206)
 ---
 ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
 configure                                     | 32 +++++++++++--------
 configure.ac                                  |  8 ++++-
 3 files changed, 29 insertions(+), 14 deletions(-)
 create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 new file mode 100644
 index 00000000000..90804c179a4
 --- /dev/null
 +++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
@@ -0,0 +1,3 @@
 +On macOS, do not attempt to use the :manpage:`dup3(2)` and
 +:manpage:`pipe2(2)` system calls introduced in
 +macOS 27 to prevent problems when running on older systems.
 diff --git a/configure b/configure
 index 3f138a8ff11..e38f8d8ab32 100755
 --- a/configure
 +++ b/configure
@@ -20400,13 +20400,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 -fi
 -ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20417,12 +20411,6 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
@@ -20431,6 +20419,24 @@ then :
 fi
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 +fi
 +
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
 diff --git a/configure.ac b/configure.ac
 index 9fdb671d44d..9e301b6ce6e 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5280,7 +5280,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 +  AC_CHECK_FUNCS([getentropy getgroups system])
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  AC_CHECK_FUNCS([dup3 pipe2])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.2/Python-3.14.2/0002-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.2/Python-3.14.2/0002-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
@ -0,0 +1,105 @@
 From 5c927bf09aae2221636300e45187c27b8018766d Mon Sep 17 00:00:00 2001
 From: Russell Keith-Magee <russell@keith-magee.com>
 Date: Tue, 26 May 2026 13:07:16 +0800
 Subject: [PATCH] [3.14] gh-150443: Exclude explicit dup3 and pipe2 checks on
 iOS builds. (GH-150444) (#150447)
 Exclude explicit dup3 and pipe2 checks on iOS builds.
 (cherry picked from commit 629da5c914b4407e01c1dc06cbcbd8dce825fef3)
 ---
 configure    | 26 +++++++++++++-------------
 configure.ac |  6 +++---
 2 files changed, 16 insertions(+), 16 deletions(-)
 diff --git a/configure b/configure
 index 46eb0665bf4..3f138a8ff11 100755
 --- a/configure
 +++ b/configure
@@ -19281,12 +19281,6 @@ if test "x$ac_cv_func_dup" = xyes
 then :
   printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
 if test "x$ac_cv_func_execv" = xyes
@@ -19761,12 +19755,6 @@ if test "x$ac_cv_func_pipe" = xyes
 then :
   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
 if test "x$ac_cv_func_plock" = xyes
@@ -20412,7 +20400,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20423,6 +20417,12 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
 diff --git a/configure.ac b/configure.ac
 index bd4446e9488..9fdb671d44d 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5239,7 +5239,7 @@ fi
 # checks for library functions
 AC_CHECK_FUNCS([ \
   accept4 alarm bind_textdomain_codeset chmod chown clock closefrom close_range confstr \
 -  copy_file_range ctermid dladdr dup dup3 execv explicit_bzero explicit_memset \
 +  copy_file_range ctermid dladdr dup execv explicit_bzero explicit_memset \
   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
   gai_strerror getegid geteuid getgid getgrent getgrgid getgrgid_r \
@@ -5249,7 +5249,7 @@ AC_CHECK_FUNCS([ \
   getspnam getuid getwd grantpt if_nameindex initgroups kill killpg lchown linkat \
   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
 -  pipe2 plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
 +  plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
   posix_spawn_file_actions_addclosefrom_np \
   pread preadv preadv2 process_vm_readv \
   pthread_cond_timedwait_relative_np pthread_condattr_setclock pthread_init \
@@ -5280,7 +5280,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([getentropy getgroups system])
 +  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.2/Python-3.14.2/0003-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.2/Python-3.14.2/0003-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
@ -0,0 +1,101 @@
 From cb9757118e29df43276f01701e73fe50c57b1b25 Mon Sep 17 00:00:00 2001
 From: Ned Deily <nad@python.org>
 Date: Wed, 5 Aug 2026 00:27:28 -0700
 Subject: [PATCH] [3.14] gh-153711: Avoid use of dup3 and pipe2 calls
 introduced in macOS 27 (#155206)
 ---
 ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
 configure                                     | 32 +++++++++++--------
 configure.ac                                  |  8 ++++-
 3 files changed, 29 insertions(+), 14 deletions(-)
 create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 new file mode 100644
 index 00000000000..90804c179a4
 --- /dev/null
 +++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
@@ -0,0 +1,3 @@
 +On macOS, do not attempt to use the :manpage:`dup3(2)` and
 +:manpage:`pipe2(2)` system calls introduced in
 +macOS 27 to prevent problems when running on older systems.
 diff --git a/configure b/configure
 index 3f138a8ff11..e38f8d8ab32 100755
 --- a/configure
 +++ b/configure
@@ -20400,13 +20400,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 -fi
 -ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20417,12 +20411,6 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
@@ -20431,6 +20419,24 @@ then :
 fi
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 +fi
 +
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
 diff --git a/configure.ac b/configure.ac
 index 9fdb671d44d..9e301b6ce6e 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5280,7 +5280,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 +  AC_CHECK_FUNCS([getentropy getgroups system])
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  AC_CHECK_FUNCS([dup3 pipe2])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.3/Python-3.14.3/0002-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.3/Python-3.14.3/0002-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
@ -0,0 +1,105 @@
 From 14dbab4f78b96ddc611b50558c50b548ae744032 Mon Sep 17 00:00:00 2001
 From: Russell Keith-Magee <russell@keith-magee.com>
 Date: Tue, 26 May 2026 13:07:16 +0800
 Subject: [PATCH] [3.14] gh-150443: Exclude explicit dup3 and pipe2 checks on
 iOS builds. (GH-150444) (#150447)
 Exclude explicit dup3 and pipe2 checks on iOS builds.
 (cherry picked from commit 629da5c914b4407e01c1dc06cbcbd8dce825fef3)
 ---
 configure    | 26 +++++++++++++-------------
 configure.ac |  6 +++---
 2 files changed, 16 insertions(+), 16 deletions(-)
 diff --git a/configure b/configure
 index 645628fecf2..2dae6dd38dc 100755
 --- a/configure
 +++ b/configure
@@ -19281,12 +19281,6 @@ if test "x$ac_cv_func_dup" = xyes
 then :
   printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
 if test "x$ac_cv_func_execv" = xyes
@@ -19761,12 +19755,6 @@ if test "x$ac_cv_func_pipe" = xyes
 then :
   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
 if test "x$ac_cv_func_plock" = xyes
@@ -20412,7 +20400,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20423,6 +20417,12 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
 diff --git a/configure.ac b/configure.ac
 index d81c76fc122..20411ee381c 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5239,7 +5239,7 @@ fi
 # checks for library functions
 AC_CHECK_FUNCS([ \
   accept4 alarm bind_textdomain_codeset chmod chown clock closefrom close_range confstr \
 -  copy_file_range ctermid dladdr dup dup3 execv explicit_bzero explicit_memset \
 +  copy_file_range ctermid dladdr dup execv explicit_bzero explicit_memset \
   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
   gai_strerror getegid geteuid getgid getgrent getgrgid getgrgid_r \
@@ -5249,7 +5249,7 @@ AC_CHECK_FUNCS([ \
   getspnam getuid getwd grantpt if_nameindex initgroups kill killpg lchown linkat \
   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
 -  pipe2 plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
 +  plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
   posix_spawn_file_actions_addclosefrom_np \
   pread preadv preadv2 process_vm_readv \
   pthread_cond_timedwait_relative_np pthread_condattr_setclock pthread_init \
@@ -5280,7 +5280,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([getentropy getgroups system])
 +  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.3/Python-3.14.3/0003-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.3/Python-3.14.3/0003-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
@ -0,0 +1,101 @@
 From 78204cc8e5beb318cee9bf831146bd339602c4c3 Mon Sep 17 00:00:00 2001
 From: Ned Deily <nad@python.org>
 Date: Wed, 5 Aug 2026 00:27:28 -0700
 Subject: [PATCH] [3.14] gh-153711: Avoid use of dup3 and pipe2 calls
 introduced in macOS 27 (#155206)
 ---
 ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
 configure                                     | 32 +++++++++++--------
 configure.ac                                  |  8 ++++-
 3 files changed, 29 insertions(+), 14 deletions(-)
 create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 new file mode 100644
 index 00000000000..90804c179a4
 --- /dev/null
 +++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
@@ -0,0 +1,3 @@
 +On macOS, do not attempt to use the :manpage:`dup3(2)` and
 +:manpage:`pipe2(2)` system calls introduced in
 +macOS 27 to prevent problems when running on older systems.
 diff --git a/configure b/configure
 index 2dae6dd38dc..74c9f7e0a3c 100755
 --- a/configure
 +++ b/configure
@@ -20400,13 +20400,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 -fi
 -ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20417,12 +20411,6 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
@@ -20431,6 +20419,24 @@ then :
 fi
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 +fi
 +
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
 diff --git a/configure.ac b/configure.ac
 index 20411ee381c..9c4fef6971e 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5280,7 +5280,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 +  AC_CHECK_FUNCS([getentropy getgroups system])
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  AC_CHECK_FUNCS([dup3 pipe2])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.4/Python-3.14.4/0002-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.4/Python-3.14.4/0002-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
@ -0,0 +1,105 @@
 From 3ccb6c32cce56e55823dc406e2cdd8f33d588bba Mon Sep 17 00:00:00 2001
 From: Russell Keith-Magee <russell@keith-magee.com>
 Date: Tue, 26 May 2026 13:07:16 +0800
 Subject: [PATCH] [3.14] gh-150443: Exclude explicit dup3 and pipe2 checks on
 iOS builds. (GH-150444) (#150447)
 Exclude explicit dup3 and pipe2 checks on iOS builds.
 (cherry picked from commit 629da5c914b4407e01c1dc06cbcbd8dce825fef3)
 ---
 configure    | 26 +++++++++++++-------------
 configure.ac |  6 +++---
 2 files changed, 16 insertions(+), 16 deletions(-)
 diff --git a/configure b/configure
 index 8cfdda5a29b..c3e9474bbec 100755
 --- a/configure
 +++ b/configure
@@ -19321,12 +19321,6 @@ if test "x$ac_cv_func_dup" = xyes
 then :
   printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
 if test "x$ac_cv_func_execv" = xyes
@@ -19801,12 +19795,6 @@ if test "x$ac_cv_func_pipe" = xyes
 then :
   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
 if test "x$ac_cv_func_plock" = xyes
@@ -20452,7 +20440,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20463,6 +20457,12 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
 diff --git a/configure.ac b/configure.ac
 index 1acb91fd27b..67128cc4ad0 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5242,7 +5242,7 @@ fi
 # checks for library functions
 AC_CHECK_FUNCS([ \
   accept4 alarm bind_textdomain_codeset chmod chown clock closefrom close_range confstr \
 -  copy_file_range ctermid dladdr dup dup3 execv explicit_bzero explicit_memset \
 +  copy_file_range ctermid dladdr dup execv explicit_bzero explicit_memset \
   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
   gai_strerror getegid geteuid getgid getgrent getgrgid getgrgid_r \
@@ -5252,7 +5252,7 @@ AC_CHECK_FUNCS([ \
   getspnam getuid getwd grantpt if_nameindex initgroups kill killpg lchown linkat \
   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
 -  pipe2 plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
 +  plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
   posix_spawn_file_actions_addclosefrom_np \
   pread preadv preadv2 process_vm_readv \
   pthread_cond_timedwait_relative_np pthread_condattr_setclock pthread_init \
@@ -5283,7 +5283,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([getentropy getgroups system])
 +  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.4/Python-3.14.4/0003-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.4/Python-3.14.4/0003-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
@ -0,0 +1,101 @@
 From 0883623df9ba2ea83d2f9dc3031ac9d975824d98 Mon Sep 17 00:00:00 2001
 From: Ned Deily <nad@python.org>
 Date: Wed, 5 Aug 2026 00:27:28 -0700
 Subject: [PATCH] [3.14] gh-153711: Avoid use of dup3 and pipe2 calls
 introduced in macOS 27 (#155206)
 ---
 ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
 configure                                     | 32 +++++++++++--------
 configure.ac                                  |  8 ++++-
 3 files changed, 29 insertions(+), 14 deletions(-)
 create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 new file mode 100644
 index 00000000000..90804c179a4
 --- /dev/null
 +++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
@@ -0,0 +1,3 @@
 +On macOS, do not attempt to use the :manpage:`dup3(2)` and
 +:manpage:`pipe2(2)` system calls introduced in
 +macOS 27 to prevent problems when running on older systems.
 diff --git a/configure b/configure
 index c3e9474bbec..89233599659 100755
 --- a/configure
 +++ b/configure
@@ -20440,13 +20440,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 -fi
 -ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20457,12 +20451,6 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
@@ -20471,6 +20459,24 @@ then :
 fi
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 +fi
 +
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
 diff --git a/configure.ac b/configure.ac
 index 67128cc4ad0..c004fce7770 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5283,7 +5283,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 +  AC_CHECK_FUNCS([getentropy getgroups system])
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  AC_CHECK_FUNCS([dup3 pipe2])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.5/Python-3.14.5/0002-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.5/Python-3.14.5/0002-3.14-gh-150443-Exclude-explicit-dup3-and-pipe2-check.patch
@ -0,0 +1,105 @@
 From 972bdb3578e667c1fad1b09f3ec6355229c069cd Mon Sep 17 00:00:00 2001
 From: Russell Keith-Magee <russell@keith-magee.com>
 Date: Tue, 26 May 2026 13:07:16 +0800
 Subject: [PATCH] [3.14] gh-150443: Exclude explicit dup3 and pipe2 checks on
 iOS builds. (GH-150444) (#150447)
 Exclude explicit dup3 and pipe2 checks on iOS builds.
 (cherry picked from commit 629da5c914b4407e01c1dc06cbcbd8dce825fef3)
 ---
 configure    | 26 +++++++++++++-------------
 configure.ac |  6 +++---
 2 files changed, 16 insertions(+), 16 deletions(-)
 diff --git a/configure b/configure
 index 30590a397f8..a5308e561aa 100755
 --- a/configure
 +++ b/configure
@@ -19375,12 +19375,6 @@ if test "x$ac_cv_func_dup" = xyes
 then :
   printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
 if test "x$ac_cv_func_execv" = xyes
@@ -19855,12 +19849,6 @@ if test "x$ac_cv_func_pipe" = xyes
 then :
   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
 if test "x$ac_cv_func_plock" = xyes
@@ -20506,7 +20494,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20517,6 +20511,12 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
 diff --git a/configure.ac b/configure.ac
 index 87c0ead45a6..4ff68cd36a5 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5264,7 +5264,7 @@ fi
 # checks for library functions
 AC_CHECK_FUNCS([ \
   accept4 alarm bind_textdomain_codeset chmod chown clock closefrom close_range confstr \
 -  copy_file_range ctermid dladdr dup dup3 execv explicit_bzero explicit_memset \
 +  copy_file_range ctermid dladdr dup execv explicit_bzero explicit_memset \
   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
   gai_strerror getegid geteuid getgid getgrent getgrgid getgrgid_r \
@@ -5274,7 +5274,7 @@ AC_CHECK_FUNCS([ \
   getspnam getuid getwd grantpt if_nameindex initgroups kill killpg lchown linkat \
   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
 -  pipe2 plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
 +  plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
   posix_spawn_file_actions_addclosefrom_np \
   pread preadv preadv2 process_vm_readv \
   pthread_cond_timedwait_relative_np pthread_condattr_setclock pthread_init \
@@ -5305,7 +5305,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([getentropy getgroups system])
 +  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.5/Python-3.14.5/0003-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.5/Python-3.14.5/0003-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
@ -0,0 +1,101 @@
 From d9fe3c8f79460f2ed5309b9fd667cfdc2a3a0462 Mon Sep 17 00:00:00 2001
 From: Ned Deily <nad@python.org>
 Date: Wed, 5 Aug 2026 00:27:28 -0700
 Subject: [PATCH] [3.14] gh-153711: Avoid use of dup3 and pipe2 calls
 introduced in macOS 27 (#155206)
 ---
 ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
 configure                                     | 32 +++++++++++--------
 configure.ac                                  |  8 ++++-
 3 files changed, 29 insertions(+), 14 deletions(-)
 create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 new file mode 100644
 index 00000000000..90804c179a4
 --- /dev/null
 +++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
@@ -0,0 +1,3 @@
 +On macOS, do not attempt to use the :manpage:`dup3(2)` and
 +:manpage:`pipe2(2)` system calls introduced in
 +macOS 27 to prevent problems when running on older systems.
 diff --git a/configure b/configure
 index a5308e561aa..76ca500c68b 100755
 --- a/configure
 +++ b/configure
@@ -20494,13 +20494,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 -fi
 -ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20511,12 +20505,6 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
@@ -20525,6 +20513,24 @@ then :
 fi
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 +fi
 +
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
 diff --git a/configure.ac b/configure.ac
 index 4ff68cd36a5..b9f5217704f 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5305,7 +5305,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 +  AC_CHECK_FUNCS([getentropy getgroups system])
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  AC_CHECK_FUNCS([dup3 pipe2])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3
--- a/plugins/python-build/share/python-build/patches/3.14.6/Python-3.14.6/0002-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
+++ b/plugins/python-build/share/python-build/patches/3.14.6/Python-3.14.6/0002-3.14-gh-153711-Avoid-use-of-dup3-and-pipe2-calls-int.patch
@ -0,0 +1,101 @@
 From 39bab3a49d6f952c55c036aef1872c7d6f701039 Mon Sep 17 00:00:00 2001
 From: Ned Deily <nad@python.org>
 Date: Wed, 5 Aug 2026 00:27:28 -0700
 Subject: [PATCH] [3.14] gh-153711: Avoid use of dup3 and pipe2 calls
 introduced in macOS 27 (#155206)
 ---
 ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
 configure                                     | 32 +++++++++++--------
 configure.ac                                  |  8 ++++-
 3 files changed, 29 insertions(+), 14 deletions(-)
 create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
 new file mode 100644
 index 00000000000..90804c179a4
 --- /dev/null
 +++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
@@ -0,0 +1,3 @@
 +On macOS, do not attempt to use the :manpage:`dup3(2)` and
 +:manpage:`pipe2(2)` system calls introduced in
 +macOS 27 to prevent problems when running on older systems.
 diff --git a/configure b/configure
 index 2088290f0ee..6d669963272 100755
 --- a/configure
 +++ b/configure
@@ -20494,13 +20494,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 -if test "x$ac_cv_func_dup3" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 -
 -fi
 -ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 +  ac_fn_c_check_func "$LINENO" "getentropy" "ac_cv_func_getentropy"
 if test "x$ac_cv_func_getentropy" = xyes
 then :
   printf "%s\n" "#define HAVE_GETENTROPY 1" >>confdefs.h
@@ -20511,12 +20505,6 @@ if test "x$ac_cv_func_getgroups" = xyes
 then :
   printf "%s\n" "#define HAVE_GETGROUPS 1" >>confdefs.h
 -fi
 -ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 -if test "x$ac_cv_func_pipe2" = xyes
 -then :
 -  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 -
 fi
 ac_fn_c_check_func "$LINENO" "system" "ac_cv_func_system"
 if test "x$ac_cv_func_system" = xyes
@@ -20525,6 +20513,24 @@ then :
 fi
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
 +if test "x$ac_cv_func_dup3" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
 +
 +fi
 +ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
 +if test "x$ac_cv_func_pipe2" = xyes
 +then :
 +  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
 +
 +fi
 +
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
 diff --git a/configure.ac b/configure.ac
 index aed14946731..900bf6215e0 100644
 --- a/configure.ac
 +++ b/configure.ac
@@ -5305,7 +5305,13 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
 -  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 +  AC_CHECK_FUNCS([getentropy getgroups system])
 +fi
 +# In addition, macOS introduced dup3 and pipe2 in macOS 27, late in the
 +# lifetime of this version of Python. Rather than adding weaklinking
 +# support for them, just continue to ignore them.
 +if test "$ac_sys_system" != "iOS" -a "$ac_sys_system" != "Darwin"; then
 +  AC_CHECK_FUNCS([dup3 pipe2])
 fi
 AC_CHECK_DECL([dirfd],
 -- 
 2.55.0.windows.3