Fix compile error when using bison 3.6.1 (#2320)

Workaround issue: bison 3.6.1 generated unexpected nested-comment Closes: #2320 Signed-off-by: Huang Rui <vowstar@gmail.com>
verilator · May 13, 2020 · 68d7596 · 68d7596
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diff --git a/docs/CONTRIBUTORS b/docs/CONTRIBUTORS
@@ -14,6 +14,7 @@ Garrett Smith
 Geza Lore
 Gianfranco Costamagna
 Howard Su
+Huang Rui
 Iztok Jeras
 James Hanlon
 Jeremy Bennett

diff --git a/src/bisonpre b/src/bisonpre
@@ -212,6 +212,8 @@ sub clean_output {
         $line =~ s!\(YY_\("!(YY_((char*)"!g;
         # Fix bison 2.3 glr-parser warning about yyerrorloc.YYTYPE::yydummy uninit
         $line =~ s!(YYLTYPE yyerrloc;)!$1 yyerrloc.yydummy=0;/*bisonpre*/!g;
+        # Fix bison 3.6.1 unexpected nested-comment
+        $line =~ s!/\* "/\*.*\*/"  \*/!!g;
         $fh->write($line);
     }
     $fh->close;