Re: [Flex-help] Error changing yylex return.

[Chris v. <che...@gm...>]

Hey Fabricio,

To first order, your code all looks fine to me.  It seems like your
redeclaration is not making it into main.c -- I'd suggest maybe next
looking at the generated flex.h and seeing what it's doing with YY_DECL and
yylex.  Maybe your %{..%} block has to be moved earlier or later in the
first section?

-Chris



On Mon, Feb 29, 2016 at 2:06 PM, Fabricio S. Paranhos <
fab...@gm...> wrote:

> Hello,
>
> I'm trying to change the default return value (int) from yylex to a
> structure. According to FLEX manual it's possible to change how yylex is
> declared[1]:
>
>  >This definition may be changed by defining the YY_DECL macro. For
>  >example, you could use:
>  >
>  >         #define YY_DECL float lexscan( a, b ) float a, b;
>  >
>
> In my flex file I declared this way:
>
>  >#define YY_DECL struct token yylex(yyscan_t yyscanner)
>
> But after using this macro and compiling the final main program I got
> the following GCC error:
>
>  >main.c: In function ‘main’:
>  >main.c:14:7: error: incompatible types when assigning to type ‘struct
>  >token’ from type ‘int’
>  >   lol = yylex(scanner);
>
>
> Even after changing how yylex is declared the final result didn't
> change. After some search on the web I found this[2] stack overflow
> question, but I got the same error from GCC...
>
> Anybody can help?
>
> Here are some additional info:
> OS:   Debian 8 64bit
> GCC:  Debian 4.9.2-10 4.9.2
> Flex: 2.5.39
>
> And here are my source files:
> https://gist.github.com/anonymous/49beeae0d85b4a7f91d6
>
> Thanks in advance.
>
> [1]
> http://flex.sourceforge.net/manual/Generated-Scanner.html#Generated-Scanner
> [2]
> https://stackoverflow.com/questions/3796598/returning-non-ints-from-yylex
> --
> Fabrício S. Paranhos
>
>
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