Re: Why do some versions of bison require {} here?

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From	Kaz Kylheku <157-073-9834@kylheku.com>
Newsgroups	comp.compilers
Subject	Re: Why do some versions of bison require {} here?
Date	Fri, 4 Jan 2019 03:02:33 +0000 (UTC)
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On 2019-01-03, Philipp Klaus Krause <pkk@spth.de> wrote:
> Am 01.01.19 um 10:55 schrieb Philipp Klaus Krause:
>> [Adding the empty action forces bison to reduce the rule rather than just
>> shifting and saving state for later.  I couldn't guess why that would matter
>> in this case.  Are there precedence rules?  With your change does the grammar compile
>> cleanly or does it have conflicts? -John]
>>
>
> Well, for me (but I don't see the problem without the {} on my system -
> GNU bison 3.2.2 on Debian GNU/Linux), both with and without {}, when using
> LANG=C bison -W -y -d SDCC.y
> I get 7 warning about "empty rule without %empty", but no other
> warnings. The people reporting issues seem to be using GNU bison on
> Microsoft Windows.

Another thing to look at: does it make any difference the generated .c and .h
files. (And if so, what is the difference in the y.output produced by
the -v option).

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Why do some versions of bison require {} here? Philipp Klaus Krause <pkk@spth.de> - 2019-01-01 10:55 +0100
  Re: Why do some versions of bison require {} here? Kaz Kylheku <157-073-9834@kylheku.com> - 2019-01-02 19:29 +0000
  Re: Why do some versions of bison require {} here? Philipp Klaus Krause <pkk@spth.de> - 2019-01-03 09:15 +0100
    Re: Why do some versions of bison require {} here? Kaz Kylheku <157-073-9834@kylheku.com> - 2019-01-04 03:02 +0000

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