Re: [Flex-help] help needed in the transition from flex 2.59 to 2.6

[Will E. <wes...@gm...>]

Thanks for the additional detail. I'll look into it.

On Friday,  7 October 2016,  3:31 pm +0200, Rollastre Prostit <rol...@gm...> wrote:

> Thanks for the response.
> 
> I am sorry. You are right. I did read the version wrong.  When I say 
> 2.59 it should have been 2.5.39. But the problem is the same.
> 
> JDF@JDF /usr/bin
> $ flex -V
> flex 2.5.39
> 
> which is when it works fine as it assigns a reference to std::cin to the 
> pointer yyin  (yyin=&std::cin).
> 
> but when using flex 2.6.1
> 
> JDF@JDF /usr/bin
> $ flex --version
> flex 2.6.1
> 
> is when it uses the . operator
> 
>      yyin.rdbuf(std::cin.rdbuf());
> 
> when it should be using the -> operator.
> 
>       yyin->rdbuf(std::cin.rdbuf());
> 
> In fact, if I edit it manually, the compile error goes away.
> 
> I don't know if this is a bug or that I have to specify something in the 
> .ll file.
> 
> 
> On 07-Oct-16 1:57 PM, Will Estes wrote:
> > THe version numbers you are siting are a bit muddled. What does "flex --version" report in both cases?
> >
> > On Friday,  7 October 2016,  8:45 am +0200, Rollastre Prostit <rol...@gm...> wrote:
> >
> >> Hello list.
> >>
> >> I looks like there are some changes in the code generated by flex 2.59
> >> and 2.6 (in C++) that break my build.
> >>
> >> in 2.59 the code in question in the XXXX.lexer.cpp is this:
> >>
> >> if(!yyin)
> >>
> >> /*%if-c-only*/
> >>
> >> /*%endif*/
> >>
> >> /*%if-c++-only*/
> >>
> >> yyin=&std::cin;
> >>
> >> /*%endif*/
> >>
> >> if(!yyout)
> >>
> >> /*%if-c-only*/
> >>
> >> /*%endif*/
> >>
> >> /*%if-c++-only*/
> >>
> >> yyout=&std::cout;
> >>
> >> /*%endif*/
> >>
> >>
> >> and in 2.6 is like this:
> >> if(!yyin)
> >>
> >> /*%if-c-only*/
> >>
> >> /*%endif*/
> >>
> >> /*%if-c++-only*/
> >>
> >> yyin.rdbuf(std::cin.rdbuf());
> >>
> >> /*%endif*/
> >>
> >> if(!yyout)
> >>
> >> /*%if-c-only*/
> >>
> >> /*%endif*/
> >>
> >> /*%if-c++-only*/
> >>
> >> yyout.rdbuf(std::cout.rdbuf());
> >>
> >> /*%endif*/
> >>
> >>
> >>
> >> It turns out that the 2.59 version works fine but the 2.6 doesn't
> >> compile because yyin and yyout are pointers. I have searched for a
> >> solution for my problem in the list but I couldn't find anything. I also
> >> googled and found this
> >>
> >> http://stackoverflow.com/questions/34438023/openfoam-flex-yyin-rdbufstdcin-rdbuf-error
> >>
> >> http://htaccess9simo.blogspot.com.es/2015/12/openfoam-flex-yyinrdbufstdcinrdbuf-error.html
> >>
> >> Which basically workaround the problem by downgrading to 2.59 in the
> >> /usr/bin. I already tested this and worked for me too. But I would
> >> expect there is a better solution which doesn't require that my build
> >> system ships a specific version of flex. Does somebody know what am I
> >> doing (or not doing) that causes this problem?
> >>
> >> Thank you and sorry if the question is already posted, I just couldn't
> >> find it!
> >>
> >>
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> 
> 
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-- 
Will Estes
Flex Project Maintainer
wes...@gm...
https://github.com/westes/flex