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major overhaul of the way make handle jobs, inspired by dpb:
instead of forking a "job" per target, and having that job further fork
separate commands, have make maintain a list of jobs, indexed by pid
of currently running commands, and handle process termination
continuation-style.  This has lots of benefits:
- make is responsible for most printing, so we no longer need pipes nor
job control: make -j jobs see the tty.
- no more special-casing for jobs that don't really execute anything.
- unify code for make -jn and make -B, including signal handlers and
job waiting.  So make -n, make -q, +cmd now run commands in the same
way in all cases.
- unified more accurate error-reporting, as make knows precisely which
command failed. Commands are tagged with their lines, and we display failing
commands in silent mode.
- fine-grained "expensive" command handling (recursion limiter). Do it
per-command instead of per-target.

Moreover, signal response is now simpler, as we just block the signals
in a small critical sections, test for events, and sigpause (thanks a lot
to guenther@ and millert@), so running make is now almost always paused
without any busy-waiting.

Thanks to everyone who tested and gave input.

#ifndef DEFINES_H
#define DEFINES_H

/*	$OpenBSD: defines.h,v 1.11 2012/09/21 07:55:20 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.
 */

#ifdef HAS_STDBOOL_H
# include <stdbool.h>
#else
typedef int bool;
# define false 0
# define true 1
#endif

/* define common types in an opaque way */
struct GNode_;
typedef struct GNode_ GNode;

struct Location_;
typedef struct Location_ Location;

struct List_;
typedef struct List_ *Lst;

struct SymTable_;
typedef struct SymTable_ SymTable;

struct Buffer_;
typedef struct Buffer_ *Buffer;

struct Name;

struct ListNode_;
typedef struct ListNode_ *LstNode;

struct Job_;
typedef struct Job_ Job;

/* some useful defines for gcc */

#ifdef __GNUC__
# define UNUSED	__attribute__((__unused__))
# define HAS_INLINES
# define INLINE  __inline__
#else
# define UNUSED
#endif

#ifdef HAS_INLINES
# ifndef INLINE
#  define INLINE	inline
# endif
#endif

/*
 * debug control:
 *	There is one bit per module.  It is up to the module what debug
 *	information to print.
 */
extern int debug;
#define DEBUG_ARCH	0x0001
#define DEBUG_COND	0x0002
#define DEBUG_DIR	0x0004
#define DEBUG_GRAPH1	0x0008
#define DEBUG_GRAPH2	0x0010
#define DEBUG_JOB	0x0020
#define DEBUG_MAKE	0x0040
#define DEBUG_SUFF	0x0080
#define DEBUG_TARG	0x0100
#define DEBUG_VAR	0x0200
#define DEBUG_FOR	0x0400
#define DEBUG_LOUD	0x0800
#define DEBUG_PARALLEL	0x1000
#define DEBUG_NAME_MATCHING	0x2000
#define DEBUG_QUICKDEATH	0x4000
#define DEBUG_EXPENSIVE		0x8000

#define CONCAT(a,b)	a##b

#define DEBUG(module)	(debug & CONCAT(DEBUG_,module))

#endif