From: Nick Bowler <nbowler@draconx.ca>
Date: Sat, 23 Jan 2021 22:23:29 +0000 (-0500)
Subject: Add Bison-related configure tests.
X-Git-Url: https://git.draconx.ca/gitweb/dxcommon.git/commitdiff_plain/a525f18001c5d6339d125548c403df0bcd044f2b?hp=a525f18001c5d6339d125548c403df0bcd044f2b

Add Bison-related configure tests.

Recent versions of Bison have made a bunch of incompatible behaviour
changes.  Implement configure tests to identify some issues, so that
build compatibility with multiple versions can be achieved.

As part of this, we introduce a basic macro for finding Bison in the
first place, which will verify support for "modern" features like %code
blocks which are needed by all my Bison-using projects.
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