file.h

   1 /* Definition of target file data structures for GNU Make.
   2 Copyright (C) 1988, 89, 90, 91, 92, 93, 94 Free Software Foundation, Inc.
   3 This file is part of GNU Make.
   4
   5 GNU Make is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 GNU Make is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GNU Make; see the file COPYING.  If not, write to
  17 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  18
  19 /* Structure that represents the info on one file
  20    that the makefile says how to make.
  21    All of these are chained together through `next'.  */
  22
  23 struct file
  24   {
  25     struct file *next;
  26     char *name;
  27     struct dep *deps;
  28     struct commands *cmds;      /* Commands to execute for this target.  */
  29     int command_flags;          /* Flags OR'd in for cmds; see commands.h.  */
  30     char *stem;                 /* Implicit stem, if an implicit
  31                                    rule has been used */
  32     struct dep *also_make;      /* Targets that are made by making this.  */
  33     time_t last_mtime;          /* File's modtime, if already known.  */
  34     struct file *prev;          /* Previous entry for same file name;
  35                                    used when there are multiple double-colon
  36                                    entries for the same file.  */
  37
  38     /* File that this file was renamed to.  After any time that a
  39        file could be renamed, call `check_renamed' (below).  */
  40     struct file *renamed;
  41
  42     /* List of variable sets used for this file.  */
  43     struct variable_set_list *variables;
  44
  45     /* Immediate dependent that caused this target to be remade,
  46        or nil if there isn't one.  */
  47     struct file *parent;
  48
  49     /* For a double-colon entry, this is the first double-colon entry for
  50        the same file.  Otherwise this is null.  */
  51     struct file *double_colon;
  52
  53     short int update_status;    /* Status of the last attempt to update,
  54                                    or -1 if none has been made.  */
  55
  56     enum                        /* State of the commands.  */
  57       {         /* Note: It is important that cs_not_started be zero.  */
  58         cs_not_started,         /* Not yet started.  */
  59         cs_deps_running,        /* Dep commands running.  */
  60         cs_running,             /* Commands running.  */
  61         cs_finished             /* Commands finished.  */
  62       } command_state ENUM_BITFIELD (2);
  63
  64     unsigned int precious:1;    /* Non-0 means don't delete file on quit */
  65     unsigned int tried_implicit:1; /* Nonzero if have searched
  66                                       for implicit rule for making
  67                                       this file; don't search again.  */
  68     unsigned int updating:1;    /* Nonzero while updating deps of this file */
  69     unsigned int updated:1;     /* Nonzero if this file has been remade.  */
  70     unsigned int is_target:1;   /* Nonzero if file is described as target.  */
  71     unsigned int cmd_target:1;  /* Nonzero if file was given on cmd line.  */
  72     unsigned int phony:1;       /* Nonzero if this is a phony file
  73                                    i.e., a dependency of .PHONY.  */
  74     unsigned int intermediate:1;/* Nonzero if this is an intermediate file.  */
  75     unsigned int dontcare:1;    /* Nonzero if no complaint is to be made if
  76                                    this target cannot be remade.  */
  77   };
  78
  79 /* Number of intermediate files entered.  */
  80
  81 extern unsigned int num_intermediates;
  82
  83 extern struct file *default_goal_file, *suffix_file, *default_file;
  84
  85
  86 extern struct file *lookup_file (), *enter_file ();
  87 extern void remove_intermediates (), snap_deps ();
  88 extern void rename_file (), file_hash_enter ();
  89 extern void set_command_state ();
  90
  91
  92 extern time_t f_mtime ();
  93 #define file_mtime_1(f, v) \
  94   ((f)->last_mtime != (time_t) 0 ? (f)->last_mtime : f_mtime ((f), v))
  95 #define file_mtime(f) file_mtime_1 ((f), 1)
  96 #define file_mtime_no_search(f) file_mtime_1 ((f), 0)
  97
  98 /* Modtime value to use for `infinitely new'.  We used to get the current time
  99    from the system and use that whenever we wanted `new'.  But that causes
 100    trouble when the machine running make and the machine holding a file have
 101    different ideas about what time it is; and can also lose for `force'
 102    targets, which need to be considered newer than anything that depends on
 103    them, even if said dependents' modtimes are in the future.
 104
 105    NOTE: This assumes 32-bit `time_t's, but I cannot think of a portable way
 106    to produce the largest representable integer of a given signed type.  */
 107 #define NEW_MTIME       ((time_t) 0x7fffffff)
 108
 109
 110 #define check_renamed(file) \
 111   while ((file)->renamed != 0) (file) = (file)->renamed /* No ; here.  */