Rebuild the InnoDB lexical analyzers with flex 2.6.4

InnoDB includes 3 parsers, which use 3 lexical analyzers that
are generated with flex. Flex versions before 2.6 emitted
the keyword "register", which is deprecated in C++17.

The lexical analyzers were regenerated as follows:

for s in storage/innobase storage/xtradb
do
	(cd "$s"/pars; ./make_flex.sh)
	touch "$s"/fts/*.l
	make -C "$s"/fts -f Makefile.query
done

storage/innobase/include/pars0pars.h

 /*****************************************************************************
 
 Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 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
@@ -109,11 +110,11 @@ pars_sql(
 Retrieves characters to the lexical analyzer.
 @return number of characters copied or 0 on EOF */
 UNIV_INTERN
-int
+size_t
 pars_get_lex_chars(
 /*===============*/
 	char*	buf,		/*!< in/out: buffer where to copy */
-	int	max_size);	/*!< in: maximum number of characters which fit
+	size_t	max_size);	/*!< in: maximum number of characters which fit
 				in the buffer */
 /*************************************************************//**
 Called by yyparse on error. */

storage/innobase/pars/make_flex.sh

 #!/bin/bash
 #
 # Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved.
+# Copyright (c) 2017, 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
@@ -31,6 +32,7 @@ echo '#include "univ.i"' > $OUTFILE
 # a warning on Win64.  Add the cast.  Also define some symbols as static.
 sed -e '
 s/'"$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/;
@@ -38,11 +40,12 @@ 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\(leng\|lineno\|_flex_debug\)\)/static \2/;
+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/\(extern \)\?\(int yylex \)/UNIV_INTERN \2/;
 s/^\(\(FILE\|char\) *\* *yyget\)/MY_ATTRIBUTE((unused)) static \1/;
-s/^\(extern \)\?\(\(FILE\|char\) *\* *yy\)/static \2/;
+s/^extern \(\(FILE\|char\) *\* *yy\).*//;
+s/^\(FILE\|char\) *\* *yy/static &/;
 ' < $TMPFILE >> $OUTFILE
 
 rm $TMPFILE

storage/innobase/pars/pars0lex.l

 /*****************************************************************************
 
 Copyright (c) 1997, 2011, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 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
@@ -64,9 +65,8 @@ Created 12/14/1997 Heikki Tuuri
 #define realloc(P, A)	ut_realloc(P, A)
 #define exit(A) 	ut_error
 
-/* Note: We cast &result to int* from yysize_t* */
 #define YY_INPUT(buf, result, max_size) \
-	pars_get_lex_chars(buf, (int*) &result, max_size)
+	result = pars_get_lex_chars(buf, max_size)
 
 /* String buffer for removing quotes */
 static ulint	stringbuf_len_alloc = 0; /* Allocated length */

storage/innobase/pars/pars0pars.cc

 /*****************************************************************************
 
 Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 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
@@ -2153,16 +2154,14 @@ pars_stored_procedure_call(
 /*************************************************************//**
 Retrieves characters to the lexical analyzer. */
 UNIV_INTERN
-int
+size_t
 pars_get_lex_chars(
 /*===============*/
 	char*	buf,		/*!< in/out: buffer where to copy */
-	int	max_size)	/*!< in: maximum number of characters which fit
+	size_t	max_size)	/*!< in: maximum number of characters which fit
 				in the buffer */
 {
-	int	len;
-
-	len = static_cast<int>(
+	size_t len = size_t(
 		pars_sym_tab_global->string_len
 		- pars_sym_tab_global->next_char_pos);
 	if (len == 0) {

storage/xtradb/include/pars0pars.h

 /*****************************************************************************
 
 Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 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
@@ -109,11 +110,11 @@ pars_sql(
 Retrieves characters to the lexical analyzer.
 @return number of characters copied or 0 on EOF */
 UNIV_INTERN
-int
+size_t
 pars_get_lex_chars(
 /*===============*/
 	char*	buf,		/*!< in/out: buffer where to copy */
-	int	max_size);	/*!< in: maximum number of characters which fit
+	size_t	max_size);	/*!< in: maximum number of characters which fit
 				in the buffer */
 /*************************************************************//**
 Called by yyparse on error. */

storage/xtradb/pars/make_flex.sh

 #!/bin/bash
 #
 # Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved.
+# Copyright (c) 2017, 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
@@ -31,6 +32,7 @@ echo '#include "univ.i"' > $OUTFILE
 # a warning on Win64.  Add the cast.  Also define some symbols as static.
 sed -e '
 s/'"$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/;
@@ -38,11 +40,12 @@ 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\(leng\|lineno\|_flex_debug\)\)/static \2/;
+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/\(extern \)\?\(int yylex \)/UNIV_INTERN \2/;
 s/^\(\(FILE\|char\) *\* *yyget\)/MY_ATTRIBUTE((unused)) static \1/;
-s/^\(extern \)\?\(\(FILE\|char\) *\* *yy\)/static \2/;
+s/^extern \(\(FILE\|char\) *\* *yy\).*//;
+s/^\(FILE\|char\) *\* *yy/static &/;
 ' < $TMPFILE >> $OUTFILE
 
 rm $TMPFILE

storage/xtradb/pars/pars0lex.l

 /*****************************************************************************
 
 Copyright (c) 1997, 2011, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 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
@@ -64,9 +65,8 @@ Created 12/14/1997 Heikki Tuuri
 #define realloc(P, A)	ut_realloc(P, A)
 #define exit(A) 	ut_error
 
-/* Note: We cast &result to int* from yysize_t* */
 #define YY_INPUT(buf, result, max_size) \
-	pars_get_lex_chars(buf, (int*) &result, max_size)
+	result = pars_get_lex_chars(buf, max_size)
 
 /* String buffer for removing quotes */
 static ulint	stringbuf_len_alloc = 0; /* Allocated length */
@@ -697,10 +697,8 @@ void
 pars_lexer_close(void)
 /*==================*/
 {
-        if (yy_buffer_stack)
-  	  yylex_destroy();
-        if (stringbuf)
-  	  free(stringbuf);
+	yylex_destroy();
+	free(stringbuf);
 	stringbuf = NULL;
 	stringbuf_len_alloc = stringbuf_len = 0;
 }

storage/xtradb/pars/pars0pars.cc

 /*****************************************************************************
 
 Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 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
@@ -2153,16 +2154,14 @@ pars_stored_procedure_call(
 /*************************************************************//**
 Retrieves characters to the lexical analyzer. */
 UNIV_INTERN
-int
+size_t
 pars_get_lex_chars(
 /*===============*/
 	char*	buf,		/*!< in/out: buffer where to copy */
-	int	max_size)	/*!< in: maximum number of characters which fit
+	size_t	max_size)	/*!< in: maximum number of characters which fit
 				in the buffer */
 {
-	int	len;
-
-	len = static_cast<int>(
+	size_t len = size_t(
 		pars_sym_tab_global->string_len
 		- pars_sym_tab_global->next_char_pos);
 	if (len == 0) {