[PATCH 05/22] tools/utils: update Bison parser directives

[Elliott Mitchell <ehem+xen@xxxxxxx>]

Update per Bison's obsolete warnings.  Testing indicates these are simple
and safe.

Signed-off-by: Elliott Mitchell <ehem+xen@xxxxxxx>
---
Someone check for acceptable Bison versions?

I'm testing with Flex 2.6.4 and Bison 3.7.5.
---
 tools/libs/util/libxlu_cfg_y.y | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/tools/libs/util/libxlu_cfg_y.y b/tools/libs/util/libxlu_cfg_y.y
index 020fc63eb3..e53d8ed337 100644
--- a/tools/libs/util/libxlu_cfg_y.y
+++ b/tools/libs/util/libxlu_cfg_y.y
@@ -28,9 +28,9 @@
 }
 
 %locations
-%pure-parser
+%define api.pure
 %defines
-%error-verbose
+%define parse.error verbose
 %name-prefix "xlu__cfg_yy"
 %parse-param { CfgParseContext *ctx }
 %lex-param { ctx_scanner }
@@ -48,7 +48,7 @@
 file:  stmts
  |     stmts assignment
 
-stmts:  /* empty */
+stmts:  %empty
  |      stmts stmt
 
 stmt:   assignment endstmt
@@ -67,13 +67,12 @@ value:  atom                         { $$= 
xlu__cfg_string_mk(ctx,$1,&@1); }
 atom:   STRING                   { $$= $1; }
  |      NUMBER                   { $$= $1; }
 
-valuelist: /* empty */           { $$= xlu__cfg_list_mk(ctx,NULL,&yylloc); }
+valuelist: %empty               { $$= xlu__cfg_list_mk(ctx,NULL,&yylloc); }
  |      values                  { $$= $1; }
  |      values ',' nlok         { $$= $1; }
 
 values: value nlok                  { $$= xlu__cfg_list_mk(ctx,$1,&@1); }
  |      values ',' nlok value nlok  { xlu__cfg_list_append(ctx,$1,$4); $$= $1; 
}
 
-nlok:
-        /* nothing */
+nlok:   %empty
  |      nlok NEWLINE
-- 
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