[Octave-bug-tracker] [bug #55613] Build failure with bison 3.3.1

[Mike Miller]

Follow-up Comment #7, bug #55613 (project octave):

Right, this change doesn't alter the requirements of bison that we support at
all. To be clear, Octave currently requires bison 3.0 or newer to generate the
parser sources. This is a new requirement since 4.4, but was done about 6
months ago (https://hg.savannah.gnu.org/hgweb/octave/rev/e1c3d1c6e896). If a
user tries to build with any bison 2.x, configure will warn that it found
bison but it does not support the required syntax. This change simply adds the
-Wno-yacc option to bison's command line, which is supported by all versions
of bison that we already care about, and which fixes the bug here.

My earlier comment #3 about dropping the feature test entirely was when I
forgot or didn't remember we had already made the change 6 months ago to
require the new syntax.

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