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* doc/bison.texinfo (Bison Parser): Discuss system headers and their effect on the user name space. * src/bison.simple: (YYSTACK_ALLOC, YYSTACK_FREE, union yyalloc, YYSTACK_GAP_MAX, YYSTACK_BYTES, YYSTACK_RELOCATE): Do not define unless necessary, i.e. unless ! defined (yyoverflow) || defined (YYERROR_VERBOSE). (YYSIZE_T): New macro. Use it instead of size_t, to avoid infringing on user names when possible. (YYSTACK_USE_ALLOCA): Do not define; just use any existing defn. Simplify test for whather <alloca.h> exists. (<stdlib.h>): Include if we will use malloc, and if standard C or C++. (<stdio.h>): Include if YYDEBUG. (yymemcpy): Renamed from __yy_memcpy. Do not define unless ! defined (yyoverflow) && ! defined (yymemcpy). (yymemcpy, yyparse): Rename local variables as needed so that they all begin with 'yy'. (yystrlen, yystpcpy): New functions. (YY_DECL_NON_LSP_VARIABLES): Renamed from _YY_DECL_VARIABLES. All uses changed. (yyparse): size_t -> YYSIZE_T. Use yystrlen and yystpcpy instead of relying on string.h functions. Use YYSTACK_ALLOC and YYSTACK_FREE instead of malloc and free.