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[3.13] gh-129838: Don't redefine _Py_NO_SANITIZE_UNDEFINED (GH-129839)#130366

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Merged
vstinner merged 1 commit intopython:3.13frommiss-islington:backport-568db40-3.13
Feb 20, 2025
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,2 @@
Don't redefine ``_Py_NO_SANITIZE_UNDEFINED`` when compiling with a recent
GCC version and undefined sanitizer enabled.
9 changes: 5 additions & 4 deletionsModules/faulthandler.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -34,14 +34,15 @@
#define PUTS(fd, str) (void)_Py_write_noraise(fd, str, strlen(str))


// clang uses __attribute__((no_sanitize("undefined")))
// GCC 4.9+ uses __attribute__((no_sanitize_undefined))
#if defined(__has_feature) // Clang
// Clang and GCC 9.0+ use __attribute__((no_sanitize("undefined")))
#if defined(__has_feature)
# if __has_feature(undefined_behavior_sanitizer)
# define _Py_NO_SANITIZE_UNDEFINED __attribute__((no_sanitize("undefined")))
# endif
#endif
#if defined(__GNUC__) \

// GCC 4.9+ uses __attribute__((no_sanitize_undefined))
#if !defined(_Py_NO_SANITIZE_UNDEFINED) && defined(__GNUC__) \
&& ((__GNUC__ >= 5) || (__GNUC__ == 4) && (__GNUC_MINOR__ >= 9))
# define _Py_NO_SANITIZE_UNDEFINED __attribute__((no_sanitize_undefined))
#endif
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