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A set of big related changes. okay millert@, tested further by kettenis@
and matthieu@

This all revolves around putting ALL global variables into one single big
hash, and using flags. This removes some impossible to understand stuff,
like old varfind, and allows for some nice stuff.
- each time we reference a global variable, we create it, possibly as a dummy
variable.
- each time we go to the environment, we remember it, thus we no longer go
back to it.

Lists of dependant changes:
- isolate changes to oldVars and checkEnvFirst.
- remove VAR_CMD and VAR_GLOBAL contexts. The only distinction is in parsevar.
Split Parse_DoVar into Parse_DoVar and Parse_CmdlineVar
- rework var modules around obtain_global_var, observe flags in various
functions like Var_Value and Var_Seti.
- Var_Seti/Var_Appendi are almost the same code, use that internally.
- add magic to handle the very special SHELL variable.
- introduce Var_Definedi for the cases where we don't want the actual
value, to simplify tests.
- add keyword .poison, parse it and set global flags accordingly.
- do poison_checks where needed.
- document poison.
- in for loops, set variable temporarily, so that Var_SubstVar will also
substitute it in varmodifiers expressions.

#ifndef COND_H
#define COND_H
/*	$OpenPackages$ */
/*	$OpenBSD: cond.h,v 1.3 2007/07/08 17:44:20 espie Exp $ */

/*
 * Copyright (c) 2001 Marc Espie.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
 * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* cond
 *	Parse Makefile conditionals.
 */

/* Values returned by Cond_Eval.  */
#define COND_PARSE	0	/* Parse the next lines */
#define COND_SKIP	1	/* Skip the next lines */
#define COND_INVALID	2	/* Not a conditional statement */
#define COND_ISFOR	3
#define COND_ISUNDEF	4
#define COND_ISINCLUDE	5
#define COND_ISPOISON	6

/* whattodo = Cond_Eval(line);
 *	Parses a conditional expression (without the leading dot),
 *	and returns a decision value.
 *	State is kept internally, since conditionals nest.  */
extern int Cond_Eval(const char *);

/* Cond_End();
 *	To call at end of parsing, checks that all conditionals were
 *	closed.  */
extern void Cond_End(void);

#endif