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incompatibility between 2.7 and 3.0.2

From: Aharon Robbins
Subject: incompatibility between 2.7 and 3.0.2
Date: Mon, 08 Sep 2014 07:08:06 +0300
User-agent: Heirloom mailx 12.5 6/20/10


We're doing some experimental gawk development, and have found that
there is a difference if using bison 2.7 or 3.0.2.  If you check out
the gawk repository from savannah and checkout the 'comment' branch,

        ./configure && make && make check

Only a few tests will fail, which we're working on.

However, if you remove awkgram.c and use bison 3.0.2 to regenerate
it, then run

        make && make check

A larger number of tests fail with errors due to line numbers being
off and also a core dump, apparently from a semantic action not
getting run, or run correctly.

I'd prefer to be using the current bison for my development, but this
is something of a showstopper.

Can anyone shed some light?



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