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gh-154271: Define _XOPEN_SOURCE=600 on Solaris to enable socket ancillary data and forkserver #154273

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gh-154271: Define _XOPEN_SOURCE=600 on Solaris to enable socket ancillary data and forkserver #154273

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gh-154271: Define _XOPEN_SOURCE=600 on Solaris to enable socket ancil…
serhiy-storchaka Jul 20, 2026
7c914af
Merge remote-tracking branch 'upstream/main' into solaris-xopen-source
serhiy-storchaka Jul 22, 2026
3b3e480
Define _XOPEN_SOURCE in a single place and mention illumos
serhiy-storchaka Jul 22, 2026
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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Build/2026-07-20-20-30-00.gh-issue-154271.solxopen.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
Define ``_XOPEN_SOURCE=600`` on Solaris and illumos, so that on illumos the
socket module is built with :meth:`~socket.socket.sendmsg`,
:meth:`~socket.socket.recvmsg` and the ``CMSG_*`` helpers. This also
enables the ``forkserver`` :mod:`multiprocessing` start method.
16 changes: 11 additions & 5 deletions configure
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15 changes: 10 additions & 5 deletions configure.ac
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Expand Up @@ -871,11 +871,8 @@ case $ac_sys_system/$ac_sys_release in
# Marc Recht
NetBSD/1.5 | NetBSD/1.5.* | NetBSD/1.6 | NetBSD/1.6.* | NetBSD/1.6@<:@A-S@:>@)
define_xopen_source=no;;
# From the perspective of Solaris, _XOPEN_SOURCE is not so much a
# request to enable features supported by the standard as a request
# to disable features not supported by the standard. The best way
# for Python to use Solaris is simply to leave _XOPEN_SOURCE out
# entirely and define __EXTENSIONS__ instead.
# On Solaris, _XOPEN_SOURCE=800 hides platform specific features.
# A lower level is defined below.
SunOS/*)
define_xopen_source=no;;
# On UnixWare 7, u_long is never defined with _XOPEN_SOURCE,
Expand Down Expand Up @@ -941,6 +938,14 @@ then
# with -std=c11. Defining _ISOC23_SOURCE makes them visible again.
AC_DEFINE([_ISOC23_SOURCE], [1],
[Define to activate ISO C23 library declarations])
elif test "$ac_sys_system" = "SunOS"
then
# On illumos the socket ancillary-data API (CMSG_*, sendmsg(), recvmsg())
# is declared only with _XOPEN_SOURCE >= 600; Solaris declares it anyway.
# __EXTENSIONS__ keeps the platform specific features which _XOPEN_SOURCE
# would otherwise hide. See gh-57208.
AC_DEFINE([_XOPEN_SOURCE], [600],
[Define to the level of X/Open that your system supports])
fi

# On HP-UX mbstate_t requires _INCLUDE__STDC_A1_SOURCE
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