yacc, byacc, bison

car@access5.digex.net (Mr. Blue)
9 Jun 1998 12:22:55 -0400

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yacc, byacc, bison car@access5.digex.net (1998-06-09)
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From: car@access5.digex.net (Mr. Blue)
Newsgroups: comp.compilers
Date: 9 Jun 1998 12:22:55 -0400
Organization: Express Access Online Communications, Greenbelt, MD USA
Keywords: yacc, parse, question, comment

Can someone summarize the differences between these 3 tools? What
are the relative advantages/disadvantages to help one choose one over
the others?

[The differences are more political than functional. The original
yacc belongs to whoever owns the Bell Labs Unix source code now and is
still considered proprietary. Berkeley Yacc is freely available under
the Berkeley "just don't sue us" license, while Bison, which is
derived from Berkeley yacc is copylefted, although bison-generated
parsers now aren't. Bison has a grab bag of extra features added in.
Other than the reentrant parser option, I don't find the added stuff
very useful. -John]

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