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alloca function (when available) to extend the parser stack, due to widespread problems in unchecked stack-overflow detection. * data/glr.c (YYMAXDEPTH): Remove undef when zero. It's the user's responsibility to set it to a positive value. This lets the user specify a value that is not a preprocessor constant. * data/yacc.c (YYMAXDEPTH): Likewise. (YYSTACK_ALLOC): Define only if YYSTACK_USE_ALLOCA is nonzero. * doc/bison.texinfo (Stack Overflow): YYMAXDEPTH no longer needs to be a compile-time constant. However, explain the constraints on it. Also, explain the constraints on YYINITDEPTH. (Table of Symbols): Explain that alloca is no longer the default. Explain the user's responsibility if they define YYSTACK_USE_ALLOCA to 1.