[Cscope-devel] [ cscope-Bugs-651667 ] recent version of Bison fails on egrep.y

[<no...@so...>]

Bugs item #651667, was opened at 2002-12-10 14:20
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Category: None
Group: None
Status: Closed
Resolution: Fixed
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Hans-Bernhard Broeker (broeker)
Summary: recent version of Bison fails on egrep.y

Initial Comment:
Tried to compile cscope source (release 15.4) under 
cygwin(setup release 2.249.2.5). It fails quickly with the 
following messages:

command being run by make:

           bison -y egrep.y && mv y.tab.c egrep.c

errors:
           egrep.y:106.3: parse error, unexpected "=", 
expecting ";" or "|"

same error shows up at lines 111.3, 120.3 124.3 134.3
another error:
            egrep.y:113.4-26: invalid $ value
same error shows up at 115.4-26 too.

Version levels of different modules in cygwin:
bash-2.05b-8
binutils-20021117-1
bison-1.75-1
byacc-1.9-1
cmake-1.4.6-1


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Comment By: Nobody/Anonymous (nobody)
Date: 2002-12-11 09:47

Message:
Logged In: NO 

Yes, without any reading the man yacc/bison pages, I 
changed the egrep.y to conform to the new syntax as 
suggested, and the compilation went well. And the cscope 
binary is working fine too. I have also used ctags with this 
cscope all under cygwin/x86.

So, I guess, those lines in egrep.y with "={...}" can be safely 
changed in the source base to use "{...}".  There are only 4 or 
5 such cases between lines 105 and 130.

Thanks.

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Comment By: Hans-Bernhard Broeker (broeker)
Date: 2002-12-11 09:28

Message:
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Egrep.y *is* fixed already, but obviously only in the CVS
version only, for now. Go figure.

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Comment By: Nobody/Anonymous (nobody)
Date: 2002-12-11 09:25

Message:
Logged In: NO 

Since this is part of cscope project, I wonder if egrep.y is 
being fixed and what the fix is, to avoid using the depricated 
interfaces in yacc/bison.

Honestly, I am not yacc/bison expert, but a user of cscope in 
daily life.

So, I can read a bit of man bison man page, and try fixing it 
myself for now, and if it works, let the community know.

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Comment By: Hans-Bernhard Broeker (broeker)
Date: 2002-12-11 06:49

Message:
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user_id=27517

After some further digging, I found this ={...} syntax is
documented as a deprecated alternative to plain {...}, and
has been so for an amazing 24 years now, according to one of
the Bison guys.

Fixed by converting to correct syntax.

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Comment By: Hans-Bernhard Broeker (broeker)
Date: 2002-12-11 04:03

Message:
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user_id=27517

Hmm.. this is a bit of a puzzle.  I've looked into the man
pages of both Unix yacc and GNU bison, but couldn't find any
mention of the "={" syntax found in those lines of the file.

For the moment, I take it this means that the version of
bison you have (1.75) cannot be used with this rather old
parser source code any more.
Or, to put it another way round, the newer Bison seems to
have broken backward compatibility to YACC in some way.

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