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[3.11] gh-99069: Consolidate checks for static_assert (GH-94766) #103282

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Apr 5, 2023
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[3.11] gh-99069: Consolidate checks for static_assert (GH-94766) #103282

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29 changes: 16 additions & 13 deletions Include/pymacro.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3,20 +3,23 @@

// gh-91782: On FreeBSD 12, if the _POSIX_C_SOURCE and _XOPEN_SOURCE macros are
// defined, <sys/cdefs.h> disables C11 support and <assert.h> does not define
// the static_assert() macro. Define the static_assert() macro in Python until
// <sys/cdefs.h> suports C11:
// the static_assert() macro.
// https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255290
#if defined(__FreeBSD__) && !defined(static_assert)
# define static_assert _Static_assert
#endif

// static_assert is defined in glibc from version 2.16. Before it requires
// compiler support (gcc >= 4.6) and is called _Static_assert.
// In C++ 11 static_assert is a keyword, redefining is undefined behaviour.
#if (defined(__GLIBC__) \
&& (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 16)) \
&& !(defined(__cplusplus) && __cplusplus >= 201103L) \
&& !defined(static_assert))
//
// macOS <= 10.10 doesn't define static_assert in assert.h at all despite
// having C11 compiler support.
//
// static_assert is defined in glibc from version 2.16. Compiler support for
// the C11 _Static_assert keyword is in gcc >= 4.6.
//
// MSVC makes static_assert a keyword in C11-17, contrary to the standards.
//
// In C++11 and C2x, static_assert is a keyword, redefining is undefined
// behaviour. So only define if building as C (if __STDC_VERSION__ is defined),
// not C++, and only for C11-17.
#if !defined(static_assert) && (defined(__GNUC__) || defined(__clang__)) \
&& defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L \
&& __STDC_VERSION__ <= 201710L
# define static_assert _Static_assert
#endif

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Build/2023-02-11-05-31-05.gh-issue-99069.X4LDvY.rst
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@@ -0,0 +1 @@
Extended workaround defining ``static_assert`` when missing from the libc headers to all clang and gcc builds. In particular, this fixes building on macOS <= 10.10.