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gh-133256: Add _Py_NONSTRING macro #133257

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Merged
merged 1 commit into from
May 1, 2025
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gh-133256: Add _Py_NONSTRING macro #133257

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2 changes: 1 addition & 1 deletion Include/internal/pycore_debug_offsets.h
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Expand Up @@ -59,7 +59,7 @@ extern "C" {


typedef struct _Py_DebugOffsets {
char cookie[8];
char cookie[8] _Py_NONSTRING;
uint64_t version;
uint64_t free_threaded;
// Runtime state offset;
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15 changes: 15 additions & 0 deletions Include/pyport.h
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Expand Up @@ -685,4 +685,19 @@ extern "C" {
#endif


// _Py_NONSTRING: The nonstring variable attribute specifies that an object or
// member declaration with type array of char, signed char, or unsigned char,
// or pointer to such a type is intended to store character arrays that do not
// necessarily contain a terminating NUL.
//
// Usage:
//
// char name [8] _Py_NONSTRING;
#if _Py__has_attribute(nonstring)
# define _Py_NONSTRING __attribute__((nonstring))
#else
# define _Py_NONSTRING
#endif


#endif /* Py_PYPORT_H */
2 changes: 1 addition & 1 deletion Modules/fcntlmodule.c
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Expand Up @@ -24,7 +24,7 @@

#define GUARDSZ 8
// NUL followed by random bytes.
static const char guard[GUARDSZ] = "\x00\xfa\x69\xc4\x67\xa3\x6c\x58";
static const char guard[GUARDSZ] _Py_NONSTRING = "\x00\xfa\x69\xc4\x67\xa3\x6c\x58";

/*[clinic input]
module fcntl
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