avoid unintentional %union size increases

9b3f177c · Sergei Golubchik · 103a32fd · 9b3f177c
Commit 9b3f177c authored Jan 10, 2019 by Sergei Golubchik
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sql/sql_yacc.yy sql/sql_yacc.yy +2 -0

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--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -788,6 +788,8 @@ Virtual_column_info *add_virtual_expression(THD *thd, Item *expr)
 }
 %{
+/* avoid unintentional %union size increases, it's what a parser stack made of */
+static_assert(sizeof(YYSTYPE) == sizeof(void*)*2+8, "%union size check");
 bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
 %}