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Fix for Bug#56138 "valgrind errors about overlapping memory when double-assigning same variable",

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and related small fixes.
This commit is contained in:
Guilhem Bichot
2010-11-22 09:57:59 +01:00
parent 871930e708
commit b5586c67ec
5 changed files with 19 additions and 8 deletions
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8
sql/sql_select.cc
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@ -4034,8 +4034,12 @@ update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,
continue;
}
#ifdef HAVE_purify
/* Valgrind complains about overlapped memcpy when save_pos==use. */
#if defined(__GNUC__) && !MY_GNUC_PREREQ(4,4)
/*
Old gcc used a memcpy(), which is undefined if save_pos==use:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19410
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39480
*/
if (save_pos != use)
#endif
*save_pos= *use;