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diff --git a/storage/innobase/pars/make_flex.sh b/storage/innobase/pars/make_flex.sh
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+#!/bin/bash
+#
+# Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved.
+# Copyright (c) 2017, 2019, MariaDB Corporation.
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
+#
+# generate lexer files from flex input files.
+
+set -eu
+
+TMPFILE=_flex_tmp.cc
+OUTFILE=lexyy.cc
+
+flex -o $TMPFILE pars0lex.l
+
+# The Microsoft compiler needs its includes done in a certain order.
+echo '#include "univ.i"' > $OUTFILE
+
+# flex assigns a pointer to an int in one place without a cast, resulting in
+# a warning on Win64. Add the cast. Also define some symbols as static.
+sed -e '
+s/'"$TMPFILE"'/'"$OUTFILE"'/;
+s/^void *yyset_extra *( *YY_EXTRA_TYPE *user_defined *) *;//
+s/\(int offset = \)\((yy_c_buf_p) - (yytext_ptr)\);/\1(int)(\2);/;
+s/\(void yy\(restart\|_\(delete\|flush\)_buffer\)\)/static \1/;
+s/\(void yy_switch_to_buffer\)/MY_ATTRIBUTE((unused)) static \1/;
+s/\(void yy\(push\|pop\)_buffer_state\)/MY_ATTRIBUTE((unused)) static \1/;
+s/\(YY_BUFFER_STATE yy_create_buffer\)/static \1/;
+s/\(\(int\|void\) yy[gs]et_\)/MY_ATTRIBUTE((unused)) static \1/;
+s/\(void \*\?yy\(\(re\)\?alloc\|free\)\)/static \1/;
+s/extern int yy\(leng\|_flex_debug\|lineno\);//;
+s/\(int yy\(leng\|lineno\|_flex_debug\)\)/static \1/;
+s/\(int yylex_destroy\)/MY_ATTRIBUTE((unused)) static \1/;
+s/^\(\(FILE\|char\) *\* *yyget\)/MY_ATTRIBUTE((unused)) static \1/;
+s/^extern \(\(FILE\|char\) *\* *yy\).*//;
+s/^\(FILE\|char\) *\* *yy/static &/;
+' < $TMPFILE >> $OUTFILE
+
+rm $TMPFILE