text: /*	$NetBSD: compat.c,v 1.113 2020/07/03 08:13:23 rillig Exp $	*/
  
  /*
   * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
   * All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Adam de Boor.
   *
   * 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.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
   */
  
  /*
   * Copyright (c) 1988, 1989 by Adam de Boor
   * Copyright (c) 1989 by Berkeley Softworks
   * All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Adam de Boor.
   *
   * 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.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
   */
  
  #ifndef MAKE_NATIVE
  static char rcsid[] = "$NetBSD: compat.c,v 1.113 2020/07/03 08:13:23 rillig Exp $";
  #else
  #include <sys/cdefs.h>
  #ifndef lint
  #if 0
  static char sccsid[] = "@(#)compat.c	8.2 (Berkeley) 3/19/94";
  #else
  __RCSID("$NetBSD: compat.c,v 1.113 2020/07/03 08:13:23 rillig Exp $");
  #endif
  #endif /* not lint */
  #endif
  
  /*-
   * compat.c --
   *	The routines in this file implement the full-compatibility
   *	mode of PMake. Most of the special functionality of PMake
   *	is available in this mode. Things not supported:
   *	    - different shells.
   *	    - friendly variable substitution.
   *
   * Interface:
   *	Compat_Run	    Initialize things for this module and recreate
   *	    	  	    thems as need creatin'
   */
  
  #ifdef HAVE_CONFIG_H
  # include   "config.h"
  #endif
  #include    <sys/types.h>
  #include    <sys/stat.h>
  #include    "wait.h"
  
  #include    <ctype.h>
  #include    <errno.h>
  #include    <signal.h>
  #include    <stdio.h>
  
  #include    "make.h"
  #include    "hash.h"
  #include    "dir.h"
  #include    "job.h"
  #include    "metachar.h"
  #include    "pathnames.h"
  
  
  static GNode	    *curTarg = NULL;
  static GNode	    *ENDNode;
  static void CompatInterrupt(int);
  static pid_t compatChild;
  static int compatSigno;
  
  /*
   * CompatDeleteTarget -- delete a failed, interrupted, or otherwise
   * duffed target if not inhibited by .PRECIOUS.
   */
  static void
  CompatDeleteTarget(GNode *gn)
  {
      if ((gn != NULL) && !Targ_Precious (gn)) {
  	char	  *p1;
  	char 	  *file = Var_Value(TARGET, gn, &p1);
  
  	if (!noExecute && eunlink(file) != -1) {
  	    Error("*** %s removed", file);
  	}
  
  	free(p1);
      }
  }
  
  /*-
   *-----------------------------------------------------------------------
   * CompatInterrupt --
   *	Interrupt the creation of the current target and remove it if
   *	it ain't precious.
   *
   * Results:
   *	None.
   *
   * Side Effects:
   *	The target is removed and the process exits. If .INTERRUPT exists,
   *	its commands are run first WITH INTERRUPTS IGNORED..
   *
   * XXX: is .PRECIOUS supposed to inhibit .INTERRUPT? I doubt it, but I've
   * left the logic alone for now. - dholland 20160826
   *
   *-----------------------------------------------------------------------
   */
  static void
  CompatInterrupt(int signo)
  {
      GNode   *gn;
  
      CompatDeleteTarget(curTarg);
  
      if ((curTarg != NULL) && !Targ_Precious (curTarg)) {
  	/*
  	 * Run .INTERRUPT only if hit with interrupt signal
  	 */
  	if (signo == SIGINT) {
  	    gn = Targ_FindNode(".INTERRUPT", TARG_NOCREATE);
  	    if (gn != NULL) {
  		Compat_Make(gn, gn);
  	    }
  	}
      }
      if (signo == SIGQUIT)
  	_exit(signo);
      /*
       * If there is a child running, pass the signal on
       * we will exist after it has exited.
       */
      compatSigno = signo;
      if (compatChild > 0) {
  	KILLPG(compatChild, signo);
      } else {
  	bmake_signal(signo, SIG_DFL);
  	kill(myPid, signo);
      }
  }
  
  /*-
   *-----------------------------------------------------------------------
   * CompatRunCommand --
   *	Execute the next command for a target. If the command returns an
   *	error, the node's made field is set to ERROR and creation stops.
   *
   * Input:
   *	cmdp		Command to execute
   *	gnp		Node from which the command came
   *
   * Results:
   *	0 if the command succeeded, 1 if an error occurred.
   *
   * Side Effects:
   *	The node's 'made' field may be set to ERROR.
   *
   *-----------------------------------------------------------------------
   */
  int
  CompatRunCommand(void *cmdp, void *gnp)
  {
      char    	  *cmdStart;	/* Start of expanded command */
      char 	  *cp, *bp;
      Boolean 	  silent,   	/* Don't print command */
  	    	  doIt;		/* Execute even if -n */
      volatile Boolean errCheck; 	/* Check errors */
      WAIT_T 	  reason;   	/* Reason for child's death */
      int	    	  status;   	/* Description of child's death */
      pid_t	  cpid;	    	/* Child actually found */
      pid_t	  retstat;    	/* Result of wait */
      LstNode 	  cmdNode;  	/* Node where current command is located */
      const char  ** volatile av;	/* Argument vector for thing to exec */
      char	** volatile mav;/* Copy of the argument vector for freeing */
      int	    	  argc;	    	/* Number of arguments in av or 0 if not
  				 * dynamically allocated */
      Boolean 	  local;    	/* TRUE if command should be executed
  				 * locally */
      Boolean 	  useShell;    	/* TRUE if command should be executed
  				 * using a shell */
      char	  * volatile cmd = (char *)cmdp;
      GNode	  *gn = (GNode *)gnp;
  
      silent = gn->type & OP_SILENT;
      errCheck = !(gn->type & OP_IGNORE);
      doIt = FALSE;
  
      cmdNode = Lst_Member(gn->commands, cmd);
      cmdStart = Var_Subst(NULL, cmd, gn, VARF_WANTRES);
  
      /*
       * brk_string will return an argv with a NULL in av[0], thus causing
       * execvp to choke and die horribly. Besides, how can we execute a null
       * command? In any case, we warn the user that the command expanded to
       * nothing (is this the right thing to do?).
       */
  
      if (*cmdStart == '\0') {
  	free(cmdStart);
  	return 0;
      }
      cmd = cmdStart;
      Lst_Replace(cmdNode, cmdStart);
  
      if ((gn->type & OP_SAVE_CMDS) && (gn != ENDNode)) {
  	(void)Lst_AtEnd(ENDNode->commands, cmdStart);
  	return 0;
      }
      if (strcmp(cmdStart, "...") == 0) {
  	gn->type |= OP_SAVE_CMDS;
  	return 0;
      }
  
      while ((*cmd == '@') || (*cmd == '-') || (*cmd == '+')) {
  	switch (*cmd) {
  	case '@':
  	    silent = DEBUG(LOUD) ? FALSE : TRUE;
  	    break;
  	case '-':
  	    errCheck = FALSE;
  	    break;
  	case '+':
  	    doIt = TRUE;
  	    if (!shellName)		/* we came here from jobs */
  		Shell_Init();
  	    break;
  	}
  	cmd++;
      }
  
      while (isspace((unsigned char)*cmd))
  	cmd++;
  
      /*
       * If we did not end up with a command, just skip it.
       */
      if (!*cmd)
  	return 0;
  
  #if !defined(MAKE_NATIVE)
      /*
       * In a non-native build, the host environment might be weird enough
       * that it's necessary to go through a shell to get the correct
       * behaviour.  Or perhaps the shell has been replaced with something
       * that does extra logging, and that should not be bypassed.
       */
      useShell = TRUE;
  #else
      /*
       * Search for meta characters in the command. If there are no meta
       * characters, there's no need to execute a shell to execute the
       * command.
       *
       * Additionally variable assignments and empty commands
       * go to the shell. Therefore treat '=' and ':' like shell
       * meta characters as documented in make(1).
       */
  
      useShell = needshell(cmd, FALSE);
  #endif
  
      /*
       * Print the command before echoing if we're not supposed to be quiet for
       * this one. We also print the command if -n given.
       */
      if (!silent || NoExecute(gn)) {
  	printf("%s\n", cmd);
  	fflush(stdout);
      }
  
      /*
       * If we're not supposed to execute any commands, this is as far as
       * we go...
       */
      if (!doIt && NoExecute(gn)) {
  	return 0;
      }
      if (DEBUG(JOB))
  	fprintf(debug_file, "Execute: '%s'\n", cmd);
  
  again:
      if (useShell) {
  	/*
  	 * We need to pass the command off to the shell, typically
  	 * because the command contains a "meta" character.
  	 */
  	static const char *shargv[5];
  	int shargc;
  
  	shargc = 0;
  	shargv[shargc++] = shellPath;
  	/*
  	 * The following work for any of the builtin shell specs.
  	 */
  	if (errCheck && shellErrFlag) {
  	    shargv[shargc++] = shellErrFlag;
  	}
  	if (DEBUG(SHELL))
  		shargv[shargc++] = "-xc";
  	else
  		shargv[shargc++] = "-c";
  	shargv[shargc++] = cmd;
  	shargv[shargc++] = NULL;
  	av = shargv;
  	argc = 0;
  	bp = NULL;
  	mav = NULL;
      } else {
  	/*
  	 * No meta-characters, so no need to exec a shell. Break the command
  	 * into words to form an argument vector we can execute.
  	 */
  	mav = brk_string(cmd, &argc, TRUE, &bp);
  	if (mav == NULL) {
  		useShell = 1;
  		goto again;
  	}
  	av = (void *)mav;
      }
  
      local = TRUE;
  
  #ifdef USE_META
      if (useMeta) {
  	meta_compat_start();
      }
  #endif
  
      /*
       * Fork and execute the single command. If the fork fails, we abort.
       */
      compatChild = cpid = vFork();
      if (cpid < 0) {
  	Fatal("Could not fork");
      }
      if (cpid == 0) {
  	Var_ExportVars();
  #ifdef USE_META
  	if (useMeta) {
  	    meta_compat_child();
  	}
  #endif
  	if (local)
  	    (void)execvp(av[0], (char *const *)UNCONST(av));
  	else
  	    (void)execv(av[0], (char *const *)UNCONST(av));
  	execError("exec", av[0]);
  	_exit(1);
      }
  
      free(mav);
      free(bp);
  
      Lst_Replace(cmdNode, NULL);
  
  #ifdef USE_META
      if (useMeta) {
  	meta_compat_parent(cpid);
      }
  #endif
  
      /*
       * The child is off and running. Now all we can do is wait...
       */
      while (1) {
  
  	while ((retstat = wait(&reason)) != cpid) {
  	    if (retstat > 0)
  		JobReapChild(retstat, reason, FALSE); /* not ours? */
  	    if (retstat == -1 && errno != EINTR) {
  		break;
  	    }
  	}
  
  	if (retstat > -1) {
  	    if (WIFSTOPPED(reason)) {
  		status = WSTOPSIG(reason);		/* stopped */
  	    } else if (WIFEXITED(reason)) {
  		status = WEXITSTATUS(reason);		/* exited */
  #if defined(USE_META) && defined(USE_FILEMON_ONCE)
  		if (useMeta) {
  		    meta_cmd_finish(NULL);
  		}
  #endif
  		if (status != 0) {
  		    if (DEBUG(ERROR)) {
  		        fprintf(debug_file, "\n*** Failed target:  %s\n*** Failed command: ",
  			    gn->name);
  		        for (cp = cmd; *cp; ) {
      			    if (isspace((unsigned char)*cp)) {
  				fprintf(debug_file, " ");
  			        while (isspace((unsigned char)*cp))
  				    cp++;
  			    } else {
  				fprintf(debug_file, "%c", *cp);
  			        cp++;
  			    }
  		        }
  			fprintf(debug_file, "\n");
  		    }
  		    printf("*** Error code %d", status);
  		}
  	    } else {
  		status = WTERMSIG(reason);		/* signaled */
  		printf("*** Signal %d", status);
  	    }
  
  
  	    if (!WIFEXITED(reason) || (status != 0)) {
  		if (errCheck) {
  #ifdef USE_META
  		    if (useMeta) {
  			meta_job_error(NULL, gn, 0, status);
  		    }
  #endif
  		    gn->made = ERROR;
  		    if (keepgoing) {
  			/*
  			 * Abort the current target, but let others
  			 * continue.
  			 */
  			printf(" (continuing)\n");
  		    } else {
  			printf("\n");
  		    }
  		    if (deleteOnError) {
  			    CompatDeleteTarget(gn);
  		    }
  		} else {
  		    /*
  		     * Continue executing commands for this target.
  		     * If we return 0, this will happen...
  		     */
  		    printf(" (ignored)\n");
  		    status = 0;
  		}
  	    }
  	    break;
  	} else {
  	    Fatal("error in wait: %d: %s", retstat, strerror(errno));
  	    /*NOTREACHED*/
  	}
      }
      free(cmdStart);
      compatChild = 0;
      if (compatSigno) {
  	bmake_signal(compatSigno, SIG_DFL);
  	kill(myPid, compatSigno);
      }
  
      return status;
  }
  
  /*-
   *-----------------------------------------------------------------------
   * Compat_Make --
   *	Make a target.
   *
   * Input:
   *	gnp		The node to make
   *	pgnp		Parent to abort if necessary
   *
   * Results:
   *	0
   *
   * Side Effects:
   *	If an error is detected and not being ignored, the process exits.
   *
   *-----------------------------------------------------------------------
   */
  int
  Compat_Make(void *gnp, void *pgnp)
  {
      GNode *gn = (GNode *)gnp;
      GNode *pgn = (GNode *)pgnp;
  
      if (!shellName)		/* we came here from jobs */
  	Shell_Init();
      if (gn->made == UNMADE && (gn == pgn || (pgn->type & OP_MADE) == 0)) {
  	/*
  	 * First mark ourselves to be made, then apply whatever transformations
  	 * the suffix module thinks are necessary. Once that's done, we can
  	 * descend and make all our children. If any of them has an error
  	 * but the -k flag was given, our 'make' field will be set FALSE again.
  	 * This is our signal to not attempt to do anything but abort our
  	 * parent as well.
  	 */
  	gn->flags |= REMAKE;
  	gn->made = BEINGMADE;
  	if ((gn->type & OP_MADE) == 0)
  	    Suff_FindDeps(gn);
  	Lst_ForEach(gn->children, Compat_Make, gn);
  	if ((gn->flags & REMAKE) == 0) {
  	    gn->made = ABORTED;
  	    pgn->flags &= ~REMAKE;
  	    goto cohorts;
  	}
  
  	if (Lst_Member(gn->iParents, pgn) != NULL) {
  	    char *p1;
  	    Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), pgn);
  	    free(p1);
  	}
  
  	/*
  	 * All the children were made ok. Now cmgn->mtime contains the
  	 * modification time of the newest child, we need to find out if we
  	 * exist and when we were modified last. The criteria for datedness
  	 * are defined by the Make_OODate function.
  	 */
  	if (DEBUG(MAKE)) {
  	    fprintf(debug_file, "Examining %s...", gn->name);
  	}
  	if (! Make_OODate(gn)) {
  	    gn->made = UPTODATE;
  	    if (DEBUG(MAKE)) {
  		fprintf(debug_file, "up-to-date.\n");
  	    }
  	    goto cohorts;
  	} else if (DEBUG(MAKE)) {
  	    fprintf(debug_file, "out-of-date.\n");
  	}
  
  	/*
  	 * If the user is just seeing if something is out-of-date, exit now
  	 * to tell him/her "yes".
  	 */
  	if (queryFlag) {
  	    exit(1);
  	}
  
  	/*
  	 * We need to be re-made. We also have to make sure we've got a $?
  	 * variable. To be nice, we also define the $> variable using
  	 * Make_DoAllVar().
  	 */
  	Make_DoAllVar(gn);
  
  	/*
  	 * Alter our type to tell if errors should be ignored or things
  	 * should not be printed so CompatRunCommand knows what to do.
  	 */
  	if (Targ_Ignore(gn)) {
  	    gn->type |= OP_IGNORE;
  	}
  	if (Targ_Silent(gn)) {
  	    gn->type |= OP_SILENT;
  	}
  
  	if (Job_CheckCommands(gn, Fatal)) {
  	    /*
  	     * Our commands are ok, but we still have to worry about the -t
  	     * flag...
  	     */
  	    if (!touchFlag || (gn->type & OP_MAKE)) {
  		curTarg = gn;
  #ifdef USE_META
  		if (useMeta && !NoExecute(gn)) {
  		    meta_job_start(NULL, gn);
  		}
  #endif
  		Lst_ForEach(gn->commands, CompatRunCommand, gn);
  		curTarg = NULL;
  	    } else {
  		Job_Touch(gn, gn->type & OP_SILENT);
  	    }
  	} else {
  	    gn->made = ERROR;
  	}
  #ifdef USE_META
  	if (useMeta && !NoExecute(gn)) {
  	    if (meta_job_finish(NULL) != 0)
  		gn->made = ERROR;
  	}
  #endif
  
  	if (gn->made != ERROR) {
  	    /*
  	     * If the node was made successfully, mark it so, update
  	     * its modification time and timestamp all its parents. Note
  	     * that for .ZEROTIME targets, the timestamping isn't done.
  	     * This is to keep its state from affecting that of its parent.
  	     */
  	    gn->made = MADE;
  	    pgn->flags |= Make_Recheck(gn) == 0 ? FORCE : 0;
  	    if (!(gn->type & OP_EXEC)) {
  		pgn->flags |= CHILDMADE;
  		Make_TimeStamp(pgn, gn);
  	    }
  	} else if (keepgoing) {
  	    pgn->flags &= ~REMAKE;
  	} else {
  	    PrintOnError(gn, "\nStop.");
  	    exit(1);
  	}
      } else if (gn->made == ERROR) {
  	/*
  	 * Already had an error when making this beastie. Tell the parent
  	 * to abort.
  	 */
  	pgn->flags &= ~REMAKE;
      } else {
  	if (Lst_Member(gn->iParents, pgn) != NULL) {
  	    char *p1;
  	    Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), pgn);
  	    free(p1);
  	}
  	switch(gn->made) {
  	    case BEINGMADE:
  		Error("Graph cycles through %s", gn->name);
  		gn->made = ERROR;
  		pgn->flags &= ~REMAKE;
  		break;
  	    case MADE:
  		if ((gn->type & OP_EXEC) == 0) {
  		    pgn->flags |= CHILDMADE;
  		    Make_TimeStamp(pgn, gn);
  		}
  		break;
  	    case UPTODATE:
  		if ((gn->type & OP_EXEC) == 0) {
  		    Make_TimeStamp(pgn, gn);
  		}
  		break;
  	    default:
  		break;
  	}
      }
  
  cohorts:
      Lst_ForEach(gn->cohorts, Compat_Make, pgnp);
      return 0;
  }
  
  /*-
   *-----------------------------------------------------------------------
   * Compat_Run --
   *	Initialize this mode and start making.
   *
   * Input:
   *	targs		List of target nodes to re-create
   *
   * Results:
   *	None.
   *
   * Side Effects:
   *	Guess what?
   *
   *-----------------------------------------------------------------------
   */
  void
  Compat_Run(Lst targs)
  {
      GNode   	  *gn = NULL;/* Current root target */
      int	    	  errors;   /* Number of targets not remade due to errors */
  
      if (!shellName)
  	Shell_Init();
  
      if (bmake_signal(SIGINT, SIG_IGN) != SIG_IGN) {
  	bmake_signal(SIGINT, CompatInterrupt);
      }
      if (bmake_signal(SIGTERM, SIG_IGN) != SIG_IGN) {
  	bmake_signal(SIGTERM, CompatInterrupt);
      }
      if (bmake_signal(SIGHUP, SIG_IGN) != SIG_IGN) {
  	bmake_signal(SIGHUP, CompatInterrupt);
      }
      if (bmake_signal(SIGQUIT, SIG_IGN) != SIG_IGN) {
  	bmake_signal(SIGQUIT, CompatInterrupt);
      }
  
      ENDNode = Targ_FindNode(".END", TARG_CREATE);
      ENDNode->type = OP_SPECIAL;
      /*
       * If the user has defined a .BEGIN target, execute the commands attached
       * to it.
       */
      if (!queryFlag) {
  	gn = Targ_FindNode(".BEGIN", TARG_NOCREATE);
  	if (gn != NULL) {
  	    Compat_Make(gn, gn);
              if (gn->made == ERROR) {
                  PrintOnError(gn, "\nStop.");
                  exit(1);
              }
  	}
      }
  
      /*
       * Expand .USE nodes right now, because they can modify the structure
       * of the tree.
       */
      Make_ExpandUse(targs);
  
      /*
       * For each entry in the list of targets to create, call Compat_Make on
       * it to create the thing. Compat_Make will leave the 'made' field of gn
       * in one of several states:
       *	    UPTODATE	    gn was already up-to-date
       *	    MADE  	    gn was recreated successfully
       *	    ERROR 	    An error occurred while gn was being created
       *	    ABORTED	    gn was not remade because one of its inferiors
       *	    	  	    could not be made due to errors.
       */
      errors = 0;
      while (!Lst_IsEmpty (targs)) {
  	gn = (GNode *)Lst_DeQueue(targs);
  	Compat_Make(gn, gn);
  
  	if (gn->made == UPTODATE) {
  	    printf("`%s' is up to date.\n", gn->name);
  	} else if (gn->made == ABORTED) {
  	    printf("`%s' not remade because of errors.\n", gn->name);
  	    errors += 1;
  	}
      }
  
      /*
       * If the user has defined a .END target, run its commands.
       */
      if (errors == 0) {
  	Compat_Make(ENDNode, ENDNode);
  	if (gn->made == ERROR) {
  	    PrintOnError(gn, "\nStop.");
  	    exit(1);
  	}
      }
  }
  