On Montag, 8. Juni 2020 07:46:27 CEST Akim Demaille wrote: > Hi Christian, > > CC'd to help-bison FTR. > > > Le 7 juin 2020 à 18:17, Christian Schoenebeck <schoeneb...@crudebyte.com> > > a écrit : > > > > Hi Akim, > > > > I just realized that you removed YYTERROR from Bison. > > YYTERROR was not a documented feature. I'm curious: how did you use it?
I need it for the auto completion feature that we discussed before and which I am using as parser injected code in some projects here and there, e.g.: http://svn.linuxsampler.org/cgi-bin/viewvc.cgi/linuxsampler/trunk/src/network/lscp.y?revision=3054&view=markup#l1605 I received reports that the missing YYTERROR macro (weird macro name BTW) in Bison 3.6.x recently caused compilation errors due to this. > Bison 3.6 introduce symbol kinds, e.g., for Bison itself: > > enum yysymbol_kind_t > { > YYSYMBOL_YYEMPTY = -2, > YYSYMBOL_YYEOF = 0, /* "end of file" */ > YYSYMBOL_YYerror = 1, /* error */ > YYSYMBOL_YYUNDEF = 2, /* "invalid token" */ > YYSYMBOL_STRING = 3, /* "string" */ > YYSYMBOL_TSTRING = 4, /* "translatable string" */ > YYSYMBOL_PERCENT_TOKEN = 5, /* "%token" */ > YYSYMBOL_PERCENT_NTERM = 6, /* "%nterm" */ > YYSYMBOL_PERCENT_TYPE = 7, /* "%type" */ > > > so something like this should help supporting both: > > #ifndef YYTERROR > # define YYTERROR YYSYMBOL_YYerror > #endif > > Unfortunately it sends the present into the past instead of the converse. > Alternatively > > #ifdef YYTERROR > # define YYSYMBOL_YYerror YYTERROR > #endif Sounds like a plan to me! > or something like that, should allow you to use the public interface with > earlier versions of Bison. > > As I have to preserve backward compatibility to older Bison versions, that > > hard change is exactly Bison >= 3.6.0, correct? > > Yup. What is your current requirement? Actually that ifdef solution should be enough to fix the current compiler error with Bison >= 3.6.0, so fortunately that avoids Bison version checks. Thanks Akim! Best regards, Christian Schoenebeck
