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gh-154136: Define _ISOC23_SOURCE to fix building the math module on FreeBSD #154138

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serhiy-storchaka merged 1 commit into from
Jul 20, 2026
+19 −0
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gh-154136: Define _ISOC23_SOURCE to fix building the math module on FreeBSD #154138

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Build/2026-07-19-16-45-00.gh-issue-154136.mathpi.rst
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@@ -0,0 +1,3 @@
Fix building the :mod:`math` module on FreeBSD.
Define ``_ISOC23_SOURCE`` to make the C23 library declarations
(such as ``sinpi()`` in ``math.h``) visible.
7 changes: 7 additions & 0 deletions configure
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6 changes: 6 additions & 0 deletions configure.ac
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Expand Up @@ -935,6 +935,12 @@ then

AC_DEFINE([_POSIX_C_SOURCE], [202405L],
[Define to activate features from IEEE Std 1003.1-2024])

# Defining _POSIX_C_SOURCE and _XOPEN_SOURCE hides C23 library
# declarations on FreeBSD (e.g. sinpi() in math.h) when compiling
# with -std=c11. Defining _ISOC23_SOURCE makes them visible again.
AC_DEFINE([_ISOC23_SOURCE], [1],
[Define to activate ISO C23 library declarations])
fi

# On HP-UX mbstate_t requires _INCLUDE__STDC_A1_SOURCE
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3 changes: 3 additions & 0 deletions pyconfig.h.in
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Expand Up @@ -2143,6 +2143,9 @@
/* Define to include mbstate_t for mbrtowc */
#undef _INCLUDE__STDC_A1_SOURCE

/* Define to activate ISO C23 library declarations */
#undef _ISOC23_SOURCE

/* This must be defined on some systems to enable large file support. */
#undef _LARGEFILE_SOURCE

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