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

[Rollastre P. <rol...@gm...>]

Hi, it's been a while now and I was wondering if there has been some 
progress/feedback on this issue. (?)

Best and kind regards.


On 07-Oct-16 4:40 PM, Will Estes wrote:
> 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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