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80384c |
Remove overly optimistic definition of strmov() as stpcpy().
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80384c |
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mysql uses this macro with overlapping source and destination strings,
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which is verboten per spec, and fails on some Red Hat platforms.
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Deleting the definition is sufficient to make it fall back to a
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byte-at-a-time copy loop, which should consistently give the
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expected behavior.
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Note: the particular case that prompted this patch is reported and fixed
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at http://bugs.mysql.com/bug.php?id=48864. However, my faith in upstream's
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ability to detect this type of error is low, and I also see little evidence
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of any real performance gain from optimizing these calls. So I'm keeping
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this patch.
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diff -up mysql-5.6.10/include/m_string.h.orig mysql-5.6.10/include/m_string.h
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--- mysql-5.6.10/include/m_string.h.orig 2013-01-22 17:54:49.000000000 +0100
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+++ mysql-5.6.10/include/m_string.h 2013-02-19 14:12:58.866241727 +0100
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@@ -65,15 +65,6 @@ extern void *(*my_str_malloc)(size_t);
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extern void *(*my_str_realloc)(void *, size_t);
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extern void (*my_str_free)(void *);
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-#if defined(HAVE_STPCPY) && MY_GNUC_PREREQ(3, 4) && !defined(__INTEL_COMPILER)
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-#define strmov(A,B) __builtin_stpcpy((A),(B))
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-#elif defined(HAVE_STPCPY)
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-#define strmov(A,B) stpcpy((A),(B))
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-#ifndef stpcpy
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-extern char *stpcpy(char *, const char *); /* For AIX with gcc 2.95.3 */
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-#endif
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-#endif
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-
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/* Declared in int2str() */
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extern char _dig_vec_upper[];
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extern char _dig_vec_lower[];
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