Fix autoconf macros for detecting DOS-style pathnames.
[make.git] / variable.c
bloba0eef9b69241c9c5dc32b9338eb7cdd2ceb696b4
1 /* Internals of variables for GNU Make.
2 Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011,
4 2012 Free Software Foundation, Inc.
5 This file is part of GNU Make.
7 GNU Make is free software; you can redistribute it and/or modify it under the
8 terms of the GNU General Public License as published by the Free Software
9 Foundation; either version 3 of the License, or (at your option) any later
10 version.
12 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
14 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License along with
17 this program. If not, see <http://www.gnu.org/licenses/>. */
19 #include "make.h"
21 #include <assert.h>
23 #include "dep.h"
24 #include "filedef.h"
25 #include "job.h"
26 #include "commands.h"
27 #include "variable.h"
28 #include "rule.h"
29 #ifdef WINDOWS32
30 #include "pathstuff.h"
31 #endif
32 #include "hash.h"
34 /* Chain of all pattern-specific variables. */
36 static struct pattern_var *pattern_vars;
38 /* Pointer to the last struct in the pack of a specific size, from 1 to 255.*/
40 static struct pattern_var *last_pattern_vars[256];
42 /* Create a new pattern-specific variable struct. The new variable is
43 inserted into the PATTERN_VARS list in the shortest patterns first
44 order to support the shortest stem matching (the variables are
45 matched in the reverse order so the ones with the longest pattern
46 will be considered first). Variables with the same pattern length
47 are inserted in the definition order. */
49 struct pattern_var *
50 create_pattern_var (const char *target, const char *suffix)
52 register unsigned int len = strlen (target);
53 register struct pattern_var *p = xmalloc (sizeof (struct pattern_var));
55 if (pattern_vars != 0)
57 if (len < 256 && last_pattern_vars[len] != 0)
59 p->next = last_pattern_vars[len]->next;
60 last_pattern_vars[len]->next = p;
62 else
64 /* Find the position where we can insert this variable. */
65 register struct pattern_var **v;
67 for (v = &pattern_vars; ; v = &(*v)->next)
69 /* Insert at the end of the pack so that patterns with the
70 same length appear in the order they were defined .*/
72 if (*v == 0 || (*v)->len > len)
74 p->next = *v;
75 *v = p;
76 break;
81 else
83 pattern_vars = p;
84 p->next = 0;
87 p->target = target;
88 p->len = len;
89 p->suffix = suffix + 1;
91 if (len < 256)
92 last_pattern_vars[len] = p;
94 return p;
97 /* Look up a target in the pattern-specific variable list. */
99 static struct pattern_var *
100 lookup_pattern_var (struct pattern_var *start, const char *target)
102 struct pattern_var *p;
103 unsigned int targlen = strlen(target);
105 for (p = start ? start->next : pattern_vars; p != 0; p = p->next)
107 const char *stem;
108 unsigned int stemlen;
110 if (p->len > targlen)
111 /* It can't possibly match. */
112 continue;
114 /* From the lengths of the filename and the pattern parts,
115 find the stem: the part of the filename that matches the %. */
116 stem = target + (p->suffix - p->target - 1);
117 stemlen = targlen - p->len + 1;
119 /* Compare the text in the pattern before the stem, if any. */
120 if (stem > target && !strneq (p->target, target, stem - target))
121 continue;
123 /* Compare the text in the pattern after the stem, if any.
124 We could test simply using streq, but this way we compare the
125 first two characters immediately. This saves time in the very
126 common case where the first character matches because it is a
127 period. */
128 if (*p->suffix == stem[stemlen]
129 && (*p->suffix == '\0' || streq (&p->suffix[1], &stem[stemlen+1])))
130 break;
133 return p;
136 /* Hash table of all global variable definitions. */
138 static unsigned long
139 variable_hash_1 (const void *keyv)
141 struct variable const *key = (struct variable const *) keyv;
142 return_STRING_N_HASH_1 (key->name, key->length);
145 static unsigned long
146 variable_hash_2 (const void *keyv)
148 struct variable const *key = (struct variable const *) keyv;
149 return_STRING_N_HASH_2 (key->name, key->length);
152 static int
153 variable_hash_cmp (const void *xv, const void *yv)
155 struct variable const *x = (struct variable const *) xv;
156 struct variable const *y = (struct variable const *) yv;
157 int result = x->length - y->length;
158 if (result)
159 return result;
160 return_STRING_N_COMPARE (x->name, y->name, x->length);
163 #ifndef VARIABLE_BUCKETS
164 #define VARIABLE_BUCKETS 523
165 #endif
166 #ifndef PERFILE_VARIABLE_BUCKETS
167 #define PERFILE_VARIABLE_BUCKETS 23
168 #endif
169 #ifndef SMALL_SCOPE_VARIABLE_BUCKETS
170 #define SMALL_SCOPE_VARIABLE_BUCKETS 13
171 #endif
173 static struct variable_set global_variable_set;
174 static struct variable_set_list global_setlist
175 = { 0, &global_variable_set, 0 };
176 struct variable_set_list *current_variable_set_list = &global_setlist;
178 /* Implement variables. */
180 void
181 init_hash_global_variable_set (void)
183 hash_init (&global_variable_set.table, VARIABLE_BUCKETS,
184 variable_hash_1, variable_hash_2, variable_hash_cmp);
187 /* Define variable named NAME with value VALUE in SET. VALUE is copied.
188 LENGTH is the length of NAME, which does not need to be null-terminated.
189 ORIGIN specifies the origin of the variable (makefile, command line
190 or environment).
191 If RECURSIVE is nonzero a flag is set in the variable saying
192 that it should be recursively re-expanded. */
194 struct variable *
195 define_variable_in_set (const char *name, unsigned int length,
196 const char *value, enum variable_origin origin,
197 int recursive, struct variable_set *set,
198 const struct floc *flocp)
200 struct variable *v;
201 struct variable **var_slot;
202 struct variable var_key;
204 if (set == NULL)
205 set = &global_variable_set;
207 var_key.name = (char *) name;
208 var_key.length = length;
209 var_slot = (struct variable **) hash_find_slot (&set->table, &var_key);
211 if (env_overrides && origin == o_env)
212 origin = o_env_override;
214 v = *var_slot;
215 if (! HASH_VACANT (v))
217 if (env_overrides && v->origin == o_env)
218 /* V came from in the environment. Since it was defined
219 before the switches were parsed, it wasn't affected by -e. */
220 v->origin = o_env_override;
222 /* A variable of this name is already defined.
223 If the old definition is from a stronger source
224 than this one, don't redefine it. */
225 if ((int) origin >= (int) v->origin)
227 if (v->value != 0)
228 free (v->value);
229 v->value = xstrdup (value);
230 if (flocp != 0)
231 v->fileinfo = *flocp;
232 else
233 v->fileinfo.filenm = 0;
234 v->origin = origin;
235 v->recursive = recursive;
237 return v;
240 /* Create a new variable definition and add it to the hash table. */
242 v = xmalloc (sizeof (struct variable));
243 v->name = xstrndup (name, length);
244 v->length = length;
245 hash_insert_at (&set->table, v, var_slot);
246 v->value = xstrdup (value);
247 if (flocp != 0)
248 v->fileinfo = *flocp;
249 else
250 v->fileinfo.filenm = 0;
251 v->origin = origin;
252 v->recursive = recursive;
253 v->special = 0;
254 v->expanding = 0;
255 v->exp_count = 0;
256 v->per_target = 0;
257 v->append = 0;
258 v->private_var = 0;
259 v->export = v_default;
261 v->exportable = 1;
262 if (*name != '_' && (*name < 'A' || *name > 'Z')
263 && (*name < 'a' || *name > 'z'))
264 v->exportable = 0;
265 else
267 for (++name; *name != '\0'; ++name)
268 if (*name != '_' && (*name < 'a' || *name > 'z')
269 && (*name < 'A' || *name > 'Z') && !ISDIGIT(*name))
270 break;
272 if (*name != '\0')
273 v->exportable = 0;
276 return v;
280 /* Undefine variable named NAME in SET. LENGTH is the length of NAME, which
281 does not need to be null-terminated. ORIGIN specifies the origin of the
282 variable (makefile, command line or environment). */
284 static void
285 free_variable_name_and_value (const void *item);
287 void
288 undefine_variable_in_set (const char *name, unsigned int length,
289 enum variable_origin origin,
290 struct variable_set *set)
292 struct variable *v;
293 struct variable **var_slot;
294 struct variable var_key;
296 if (set == NULL)
297 set = &global_variable_set;
299 var_key.name = (char *) name;
300 var_key.length = length;
301 var_slot = (struct variable **) hash_find_slot (&set->table, &var_key);
303 if (env_overrides && origin == o_env)
304 origin = o_env_override;
306 v = *var_slot;
307 if (! HASH_VACANT (v))
309 if (env_overrides && v->origin == o_env)
310 /* V came from in the environment. Since it was defined
311 before the switches were parsed, it wasn't affected by -e. */
312 v->origin = o_env_override;
314 /* If the definition is from a stronger source than this one, don't
315 undefine it. */
316 if ((int) origin >= (int) v->origin)
318 hash_delete_at (&set->table, var_slot);
319 free_variable_name_and_value (v);
324 /* If the variable passed in is "special", handle its special nature.
325 Currently there are two such variables, both used for introspection:
326 .VARIABLES expands to a list of all the variables defined in this instance
327 of make.
328 .TARGETS expands to a list of all the targets defined in this
329 instance of make.
330 Returns the variable reference passed in. */
332 #define EXPANSION_INCREMENT(_l) ((((_l) / 500) + 1) * 500)
334 static struct variable *
335 lookup_special_var (struct variable *var)
337 static unsigned long last_var_count = 0;
340 /* This one actually turns out to be very hard, due to the way the parser
341 records targets. The way it works is that target information is collected
342 internally until make knows the target is completely specified. It unitl
343 it sees that some new construct (a new target or variable) is defined that
344 it knows the previous one is done. In short, this means that if you do
345 this:
347 all:
349 TARGS := $(.TARGETS)
351 then $(TARGS) won't contain "all", because it's not until after the
352 variable is created that the previous target is completed.
354 Changing this would be a major pain. I think a less complex way to do it
355 would be to pre-define the target files as soon as the first line is
356 parsed, then come back and do the rest of the definition as now. That
357 would allow $(.TARGETS) to be correct without a major change to the way
358 the parser works.
360 if (streq (var->name, ".TARGETS"))
361 var->value = build_target_list (var->value);
362 else
365 if (streq (var->name, ".VARIABLES")
366 && global_variable_set.table.ht_fill != last_var_count)
368 unsigned long max = EXPANSION_INCREMENT (strlen (var->value));
369 unsigned long len;
370 char *p;
371 struct variable **vp = (struct variable **) global_variable_set.table.ht_vec;
372 struct variable **end = &vp[global_variable_set.table.ht_size];
374 /* Make sure we have at least MAX bytes in the allocated buffer. */
375 var->value = xrealloc (var->value, max);
377 /* Walk through the hash of variables, constructing a list of names. */
378 p = var->value;
379 len = 0;
380 for (; vp < end; ++vp)
381 if (!HASH_VACANT (*vp))
383 struct variable *v = *vp;
384 int l = v->length;
386 len += l + 1;
387 if (len > max)
389 unsigned long off = p - var->value;
391 max += EXPANSION_INCREMENT (l + 1);
392 var->value = xrealloc (var->value, max);
393 p = &var->value[off];
396 memcpy (p, v->name, l);
397 p += l;
398 *(p++) = ' ';
400 *(p-1) = '\0';
402 /* Remember how many variables are in our current count. Since we never
403 remove variables from the list, this is a reliable way to know whether
404 the list is up to date or needs to be recomputed. */
406 last_var_count = global_variable_set.table.ht_fill;
409 return var;
413 /* Lookup a variable whose name is a string starting at NAME
414 and with LENGTH chars. NAME need not be null-terminated.
415 Returns address of the `struct variable' containing all info
416 on the variable, or nil if no such variable is defined. */
418 struct variable *
419 lookup_variable (const char *name, unsigned int length)
421 const struct variable_set_list *setlist;
422 struct variable var_key;
423 int is_parent = 0;
425 var_key.name = (char *) name;
426 var_key.length = length;
428 for (setlist = current_variable_set_list;
429 setlist != 0; setlist = setlist->next)
431 const struct variable_set *set = setlist->set;
432 struct variable *v;
434 v = (struct variable *) hash_find_item ((struct hash_table *) &set->table, &var_key);
435 if (v && (!is_parent || !v->private_var))
436 return v->special ? lookup_special_var (v) : v;
438 is_parent |= setlist->next_is_parent;
441 #ifdef VMS
442 /* since we don't read envp[] on startup, try to get the
443 variable via getenv() here. */
445 char *vname = alloca (length + 1);
446 char *value;
447 strncpy (vname, name, length);
448 vname[length] = 0;
449 value = getenv (vname);
450 if (value != 0)
452 char *sptr;
453 int scnt;
455 sptr = value;
456 scnt = 0;
458 while ((sptr = strchr (sptr, '$')))
460 scnt++;
461 sptr++;
464 if (scnt > 0)
466 char *nvalue;
467 char *nptr;
469 nvalue = alloca (strlen (value) + scnt + 1);
470 sptr = value;
471 nptr = nvalue;
473 while (*sptr)
475 if (*sptr == '$')
477 *nptr++ = '$';
478 *nptr++ = '$';
480 else
482 *nptr++ = *sptr;
484 sptr++;
487 *nptr = '\0';
488 return define_variable (vname, length, nvalue, o_env, 1);
492 return define_variable (vname, length, value, o_env, 1);
495 #endif /* VMS */
497 return 0;
500 /* Lookup a variable whose name is a string starting at NAME
501 and with LENGTH chars in set SET. NAME need not be null-terminated.
502 Returns address of the `struct variable' containing all info
503 on the variable, or nil if no such variable is defined. */
505 struct variable *
506 lookup_variable_in_set (const char *name, unsigned int length,
507 const struct variable_set *set)
509 struct variable var_key;
511 var_key.name = (char *) name;
512 var_key.length = length;
514 return (struct variable *) hash_find_item ((struct hash_table *) &set->table, &var_key);
517 /* Initialize FILE's variable set list. If FILE already has a variable set
518 list, the topmost variable set is left intact, but the the rest of the
519 chain is replaced with FILE->parent's setlist. If FILE is a double-colon
520 rule, then we will use the "root" double-colon target's variable set as the
521 parent of FILE's variable set.
523 If we're READING a makefile, don't do the pattern variable search now,
524 since the pattern variable might not have been defined yet. */
526 void
527 initialize_file_variables (struct file *file, int reading)
529 struct variable_set_list *l = file->variables;
531 if (l == 0)
533 l = (struct variable_set_list *)
534 xmalloc (sizeof (struct variable_set_list));
535 l->set = xmalloc (sizeof (struct variable_set));
536 hash_init (&l->set->table, PERFILE_VARIABLE_BUCKETS,
537 variable_hash_1, variable_hash_2, variable_hash_cmp);
538 file->variables = l;
541 /* If this is a double-colon, then our "parent" is the "root" target for
542 this double-colon rule. Since that rule has the same name, parent,
543 etc. we can just use its variables as the "next" for ours. */
545 if (file->double_colon && file->double_colon != file)
547 initialize_file_variables (file->double_colon, reading);
548 l->next = file->double_colon->variables;
549 l->next_is_parent = 0;
550 return;
553 if (file->parent == 0)
554 l->next = &global_setlist;
555 else
557 initialize_file_variables (file->parent, reading);
558 l->next = file->parent->variables;
560 l->next_is_parent = 1;
562 /* If we're not reading makefiles and we haven't looked yet, see if
563 we can find pattern variables for this target. */
565 if (!reading && !file->pat_searched)
567 struct pattern_var *p;
569 p = lookup_pattern_var (0, file->name);
570 if (p != 0)
572 struct variable_set_list *global = current_variable_set_list;
574 /* We found at least one. Set up a new variable set to accumulate
575 all the pattern variables that match this target. */
577 file->pat_variables = create_new_variable_set ();
578 current_variable_set_list = file->pat_variables;
582 /* We found one, so insert it into the set. */
584 struct variable *v;
586 if (p->variable.flavor == f_simple)
588 v = define_variable_loc (
589 p->variable.name, strlen (p->variable.name),
590 p->variable.value, p->variable.origin,
591 0, &p->variable.fileinfo);
593 v->flavor = f_simple;
595 else
597 v = do_variable_definition (
598 &p->variable.fileinfo, p->variable.name,
599 p->variable.value, p->variable.origin,
600 p->variable.flavor, 1);
603 /* Also mark it as a per-target and copy export status. */
604 v->per_target = p->variable.per_target;
605 v->export = p->variable.export;
606 v->private_var = p->variable.private_var;
608 while ((p = lookup_pattern_var (p, file->name)) != 0);
610 current_variable_set_list = global;
612 file->pat_searched = 1;
615 /* If we have a pattern variable match, set it up. */
617 if (file->pat_variables != 0)
619 file->pat_variables->next = l->next;
620 file->pat_variables->next_is_parent = l->next_is_parent;
621 l->next = file->pat_variables;
622 l->next_is_parent = 0;
626 /* Pop the top set off the current variable set list,
627 and free all its storage. */
629 struct variable_set_list *
630 create_new_variable_set (void)
632 register struct variable_set_list *setlist;
633 register struct variable_set *set;
635 set = xmalloc (sizeof (struct variable_set));
636 hash_init (&set->table, SMALL_SCOPE_VARIABLE_BUCKETS,
637 variable_hash_1, variable_hash_2, variable_hash_cmp);
639 setlist = (struct variable_set_list *)
640 xmalloc (sizeof (struct variable_set_list));
641 setlist->set = set;
642 setlist->next = current_variable_set_list;
643 setlist->next_is_parent = 0;
645 return setlist;
648 static void
649 free_variable_name_and_value (const void *item)
651 struct variable *v = (struct variable *) item;
652 free (v->name);
653 free (v->value);
656 void
657 free_variable_set (struct variable_set_list *list)
659 hash_map (&list->set->table, free_variable_name_and_value);
660 hash_free (&list->set->table, 1);
661 free (list->set);
662 free (list);
665 /* Create a new variable set and push it on the current setlist.
666 If we're pushing a global scope (that is, the current scope is the global
667 scope) then we need to "push" it the other way: file variable sets point
668 directly to the global_setlist so we need to replace that with the new one.
671 struct variable_set_list *
672 push_new_variable_scope (void)
674 current_variable_set_list = create_new_variable_set();
675 if (current_variable_set_list->next == &global_setlist)
677 /* It was the global, so instead of new -> &global we want to replace
678 &global with the new one and have &global -> new, with current still
679 pointing to &global */
680 struct variable_set *set = current_variable_set_list->set;
681 current_variable_set_list->set = global_setlist.set;
682 global_setlist.set = set;
683 current_variable_set_list->next = global_setlist.next;
684 global_setlist.next = current_variable_set_list;
685 current_variable_set_list = &global_setlist;
687 return (current_variable_set_list);
690 void
691 pop_variable_scope (void)
693 struct variable_set_list *setlist;
694 struct variable_set *set;
696 /* Can't call this if there's no scope to pop! */
697 assert(current_variable_set_list->next != NULL);
699 if (current_variable_set_list != &global_setlist)
701 /* We're not pointing to the global setlist, so pop this one. */
702 setlist = current_variable_set_list;
703 set = setlist->set;
704 current_variable_set_list = setlist->next;
706 else
708 /* This set is the one in the global_setlist, but there is another global
709 set beyond that. We want to copy that set to global_setlist, then
710 delete what used to be in global_setlist. */
711 setlist = global_setlist.next;
712 set = global_setlist.set;
713 global_setlist.set = setlist->set;
714 global_setlist.next = setlist->next;
715 global_setlist.next_is_parent = setlist->next_is_parent;
718 /* Free the one we no longer need. */
719 free (setlist);
720 hash_map (&set->table, free_variable_name_and_value);
721 hash_free (&set->table, 1);
722 free (set);
725 /* Merge FROM_SET into TO_SET, freeing unused storage in FROM_SET. */
727 static void
728 merge_variable_sets (struct variable_set *to_set,
729 struct variable_set *from_set)
731 struct variable **from_var_slot = (struct variable **) from_set->table.ht_vec;
732 struct variable **from_var_end = from_var_slot + from_set->table.ht_size;
734 for ( ; from_var_slot < from_var_end; from_var_slot++)
735 if (! HASH_VACANT (*from_var_slot))
737 struct variable *from_var = *from_var_slot;
738 struct variable **to_var_slot
739 = (struct variable **) hash_find_slot (&to_set->table, *from_var_slot);
740 if (HASH_VACANT (*to_var_slot))
741 hash_insert_at (&to_set->table, from_var, to_var_slot);
742 else
744 /* GKM FIXME: delete in from_set->table */
745 free (from_var->value);
746 free (from_var);
751 /* Merge SETLIST1 into SETLIST0, freeing unused storage in SETLIST1. */
753 void
754 merge_variable_set_lists (struct variable_set_list **setlist0,
755 struct variable_set_list *setlist1)
757 struct variable_set_list *to = *setlist0;
758 struct variable_set_list *last0 = 0;
760 /* If there's nothing to merge, stop now. */
761 if (!setlist1)
762 return;
764 /* This loop relies on the fact that all setlists terminate with the global
765 setlist (before NULL). If that's not true, arguably we SHOULD die. */
766 if (to)
767 while (setlist1 != &global_setlist && to != &global_setlist)
769 struct variable_set_list *from = setlist1;
770 setlist1 = setlist1->next;
772 merge_variable_sets (to->set, from->set);
774 last0 = to;
775 to = to->next;
778 if (setlist1 != &global_setlist)
780 if (last0 == 0)
781 *setlist0 = setlist1;
782 else
783 last0->next = setlist1;
787 /* Define the automatic variables, and record the addresses
788 of their structures so we can change their values quickly. */
790 void
791 define_automatic_variables (void)
793 #if defined(WINDOWS32) || defined(__EMX__)
794 extern char* default_shell;
795 #else
796 extern char default_shell[];
797 #endif
798 register struct variable *v;
799 char buf[200];
801 sprintf (buf, "%u", makelevel);
802 define_variable_cname (MAKELEVEL_NAME, buf, o_env, 0);
804 sprintf (buf, "%s%s%s",
805 version_string,
806 (remote_description == 0 || remote_description[0] == '\0')
807 ? "" : "-",
808 (remote_description == 0 || remote_description[0] == '\0')
809 ? "" : remote_description);
810 define_variable_cname ("MAKE_VERSION", buf, o_default, 0);
812 #ifdef __MSDOS__
813 /* Allow to specify a special shell just for Make,
814 and use $COMSPEC as the default $SHELL when appropriate. */
816 static char shell_str[] = "SHELL";
817 const int shlen = sizeof (shell_str) - 1;
818 struct variable *mshp = lookup_variable ("MAKESHELL", 9);
819 struct variable *comp = lookup_variable ("COMSPEC", 7);
821 /* $(MAKESHELL) overrides $(SHELL) even if -e is in effect. */
822 if (mshp)
823 (void) define_variable (shell_str, shlen,
824 mshp->value, o_env_override, 0);
825 else if (comp)
827 /* $(COMSPEC) shouldn't override $(SHELL). */
828 struct variable *shp = lookup_variable (shell_str, shlen);
830 if (!shp)
831 (void) define_variable (shell_str, shlen, comp->value, o_env, 0);
834 #elif defined(__EMX__)
836 static char shell_str[] = "SHELL";
837 const int shlen = sizeof (shell_str) - 1;
838 struct variable *shell = lookup_variable (shell_str, shlen);
839 struct variable *replace = lookup_variable ("MAKESHELL", 9);
841 /* if $MAKESHELL is defined in the environment assume o_env_override */
842 if (replace && *replace->value && replace->origin == o_env)
843 replace->origin = o_env_override;
845 /* if $MAKESHELL is not defined use $SHELL but only if the variable
846 did not come from the environment */
847 if (!replace || !*replace->value)
848 if (shell && *shell->value && (shell->origin == o_env
849 || shell->origin == o_env_override))
851 /* overwrite whatever we got from the environment */
852 free(shell->value);
853 shell->value = xstrdup (default_shell);
854 shell->origin = o_default;
857 /* Some people do not like cmd to be used as the default
858 if $SHELL is not defined in the Makefile.
859 With -DNO_CMD_DEFAULT you can turn off this behaviour */
860 # ifndef NO_CMD_DEFAULT
861 /* otherwise use $COMSPEC */
862 if (!replace || !*replace->value)
863 replace = lookup_variable ("COMSPEC", 7);
865 /* otherwise use $OS2_SHELL */
866 if (!replace || !*replace->value)
867 replace = lookup_variable ("OS2_SHELL", 9);
868 # else
869 # warning NO_CMD_DEFAULT: GNU make will not use CMD.EXE as default shell
870 # endif
872 if (replace && *replace->value)
873 /* overwrite $SHELL */
874 (void) define_variable (shell_str, shlen, replace->value,
875 replace->origin, 0);
876 else
877 /* provide a definition if there is none */
878 (void) define_variable (shell_str, shlen, default_shell,
879 o_default, 0);
882 #endif
884 /* This won't override any definition, but it will provide one if there
885 isn't one there. */
886 v = define_variable_cname ("SHELL", default_shell, o_default, 0);
887 #ifdef __MSDOS__
888 v->export = v_export; /* Export always SHELL. */
889 #endif
891 /* On MSDOS we do use SHELL from environment, since it isn't a standard
892 environment variable on MSDOS, so whoever sets it, does that on purpose.
893 On OS/2 we do not use SHELL from environment but we have already handled
894 that problem above. */
895 #if !defined(__MSDOS__) && !defined(__EMX__)
896 /* Don't let SHELL come from the environment. */
897 if (*v->value == '\0' || v->origin == o_env || v->origin == o_env_override)
899 free (v->value);
900 v->origin = o_file;
901 v->value = xstrdup (default_shell);
903 #endif
905 /* Make sure MAKEFILES gets exported if it is set. */
906 v = define_variable_cname ("MAKEFILES", "", o_default, 0);
907 v->export = v_ifset;
909 /* Define the magic D and F variables in terms of
910 the automatic variables they are variations of. */
912 #ifdef VMS
913 define_variable_cname ("@D", "$(dir $@)", o_automatic, 1);
914 define_variable_cname ("%D", "$(dir $%)", o_automatic, 1);
915 define_variable_cname ("*D", "$(dir $*)", o_automatic, 1);
916 define_variable_cname ("<D", "$(dir $<)", o_automatic, 1);
917 define_variable_cname ("?D", "$(dir $?)", o_automatic, 1);
918 define_variable_cname ("^D", "$(dir $^)", o_automatic, 1);
919 define_variable_cname ("+D", "$(dir $+)", o_automatic, 1);
920 #elif defined(__MSDOS__) || defined(WINDOWS32)
921 /* For consistency, remove the trailing backslash as well as slash. */
922 define_variable_cname ("@D", "$(patsubst %/,%,$(patsubst %\\,%,$(dir $@)))",
923 o_automatic, 1);
924 define_variable_cname ("%D", "$(patsubst %/,%,$(patsubst %\\,%,$(dir $%)))",
925 o_automatic, 1);
926 define_variable_cname ("*D", "$(patsubst %/,%,$(patsubst %\\,%,$(dir $*)))",
927 o_automatic, 1);
928 define_variable_cname ("<D", "$(patsubst %/,%,$(patsubst %\\,%,$(dir $<)))",
929 o_automatic, 1);
930 define_variable_cname ("?D", "$(patsubst %/,%,$(patsubst %\\,%,$(dir $?)))",
931 o_automatic, 1);
932 define_variable_cname ("^D", "$(patsubst %/,%,$(patsubst %\\,%,$(dir $^)))",
933 o_automatic, 1);
934 define_variable_cname ("+D", "$(patsubst %/,%,$(patsubst %\\,%,$(dir $+)))",
935 o_automatic, 1);
936 #else /* not __MSDOS__, not WINDOWS32 */
937 define_variable_cname ("@D", "$(patsubst %/,%,$(dir $@))", o_automatic, 1);
938 define_variable_cname ("%D", "$(patsubst %/,%,$(dir $%))", o_automatic, 1);
939 define_variable_cname ("*D", "$(patsubst %/,%,$(dir $*))", o_automatic, 1);
940 define_variable_cname ("<D", "$(patsubst %/,%,$(dir $<))", o_automatic, 1);
941 define_variable_cname ("?D", "$(patsubst %/,%,$(dir $?))", o_automatic, 1);
942 define_variable_cname ("^D", "$(patsubst %/,%,$(dir $^))", o_automatic, 1);
943 define_variable_cname ("+D", "$(patsubst %/,%,$(dir $+))", o_automatic, 1);
944 #endif
945 define_variable_cname ("@F", "$(notdir $@)", o_automatic, 1);
946 define_variable_cname ("%F", "$(notdir $%)", o_automatic, 1);
947 define_variable_cname ("*F", "$(notdir $*)", o_automatic, 1);
948 define_variable_cname ("<F", "$(notdir $<)", o_automatic, 1);
949 define_variable_cname ("?F", "$(notdir $?)", o_automatic, 1);
950 define_variable_cname ("^F", "$(notdir $^)", o_automatic, 1);
951 define_variable_cname ("+F", "$(notdir $+)", o_automatic, 1);
954 int export_all_variables;
956 /* Create a new environment for FILE's commands.
957 If FILE is nil, this is for the `shell' function.
958 The child's MAKELEVEL variable is incremented. */
960 char **
961 target_environment (struct file *file)
963 struct variable_set_list *set_list;
964 register struct variable_set_list *s;
965 struct hash_table table;
966 struct variable **v_slot;
967 struct variable **v_end;
968 struct variable makelevel_key;
969 char **result_0;
970 char **result;
972 if (file == 0)
973 set_list = current_variable_set_list;
974 else
975 set_list = file->variables;
977 hash_init (&table, VARIABLE_BUCKETS,
978 variable_hash_1, variable_hash_2, variable_hash_cmp);
980 /* Run through all the variable sets in the list,
981 accumulating variables in TABLE. */
982 for (s = set_list; s != 0; s = s->next)
984 struct variable_set *set = s->set;
985 v_slot = (struct variable **) set->table.ht_vec;
986 v_end = v_slot + set->table.ht_size;
987 for ( ; v_slot < v_end; v_slot++)
988 if (! HASH_VACANT (*v_slot))
990 struct variable **new_slot;
991 struct variable *v = *v_slot;
993 /* If this is a per-target variable and it hasn't been touched
994 already then look up the global version and take its export
995 value. */
996 if (v->per_target && v->export == v_default)
998 struct variable *gv;
1000 gv = lookup_variable_in_set (v->name, strlen(v->name),
1001 &global_variable_set);
1002 if (gv)
1003 v->export = gv->export;
1006 switch (v->export)
1008 case v_default:
1009 if (v->origin == o_default || v->origin == o_automatic)
1010 /* Only export default variables by explicit request. */
1011 continue;
1013 /* The variable doesn't have a name that can be exported. */
1014 if (! v->exportable)
1015 continue;
1017 if (! export_all_variables
1018 && v->origin != o_command
1019 && v->origin != o_env && v->origin != o_env_override)
1020 continue;
1021 break;
1023 case v_export:
1024 break;
1026 case v_noexport:
1028 /* If this is the SHELL variable and it's not exported,
1029 then add the value from our original environment, if
1030 the original environment defined a value for SHELL. */
1031 extern struct variable shell_var;
1032 if (streq (v->name, "SHELL") && shell_var.value)
1034 v = &shell_var;
1035 break;
1037 continue;
1040 case v_ifset:
1041 if (v->origin == o_default)
1042 continue;
1043 break;
1046 new_slot = (struct variable **) hash_find_slot (&table, v);
1047 if (HASH_VACANT (*new_slot))
1048 hash_insert_at (&table, v, new_slot);
1052 makelevel_key.name = MAKELEVEL_NAME;
1053 makelevel_key.length = MAKELEVEL_LENGTH;
1054 hash_delete (&table, &makelevel_key);
1056 result = result_0 = xmalloc ((table.ht_fill + 2) * sizeof (char *));
1058 v_slot = (struct variable **) table.ht_vec;
1059 v_end = v_slot + table.ht_size;
1060 for ( ; v_slot < v_end; v_slot++)
1061 if (! HASH_VACANT (*v_slot))
1063 struct variable *v = *v_slot;
1065 /* If V is recursively expanded and didn't come from the environment,
1066 expand its value. If it came from the environment, it should
1067 go back into the environment unchanged. */
1068 if (v->recursive
1069 && v->origin != o_env && v->origin != o_env_override)
1071 char *value = recursively_expand_for_file (v, file);
1072 #ifdef WINDOWS32
1073 if (strcmp(v->name, "Path") == 0 ||
1074 strcmp(v->name, "PATH") == 0)
1075 convert_Path_to_windows32(value, ';');
1076 #endif
1077 *result++ = xstrdup (concat (3, v->name, "=", value));
1078 free (value);
1080 else
1082 #ifdef WINDOWS32
1083 if (strcmp(v->name, "Path") == 0 ||
1084 strcmp(v->name, "PATH") == 0)
1085 convert_Path_to_windows32(v->value, ';');
1086 #endif
1087 *result++ = xstrdup (concat (3, v->name, "=", v->value));
1091 *result = xmalloc (100);
1092 sprintf (*result, "%s=%u", MAKELEVEL_NAME, makelevel + 1);
1093 *++result = 0;
1095 hash_free (&table, 0);
1097 return result_0;
1100 static struct variable *
1101 set_special_var (struct variable *var)
1103 if (streq (var->name, RECIPEPREFIX_NAME))
1105 /* The user is resetting the command introduction prefix. This has to
1106 happen immediately, so that subsequent rules are interpreted
1107 properly. */
1108 cmd_prefix = var->value[0]=='\0' ? RECIPEPREFIX_DEFAULT : var->value[0];
1111 return var;
1114 /* Given a string, shell-execute it and return a malloc'ed string of the
1115 * result. This removes only ONE newline (if any) at the end, for maximum
1116 * compatibility with the *BSD makes. If it fails, returns NULL. */
1118 char *
1119 shell_result (const char *p)
1121 char *buf;
1122 unsigned int len;
1123 char *args[2];
1124 char *result;
1126 install_variable_buffer (&buf, &len);
1128 args[0] = (char *) p;
1129 args[1] = NULL;
1130 variable_buffer_output (func_shell_base (variable_buffer, args, 0), "\0", 1);
1131 result = strdup (variable_buffer);
1133 restore_variable_buffer (buf, len);
1134 return result;
1137 /* Given a variable, a value, and a flavor, define the variable.
1138 See the try_variable_definition() function for details on the parameters. */
1140 struct variable *
1141 do_variable_definition (const struct floc *flocp, const char *varname,
1142 const char *value, enum variable_origin origin,
1143 enum variable_flavor flavor, int target_var)
1145 const char *p;
1146 char *alloc_value = NULL;
1147 struct variable *v;
1148 int append = 0;
1149 int conditional = 0;
1151 /* Calculate the variable's new value in VALUE. */
1153 switch (flavor)
1155 default:
1156 case f_bogus:
1157 /* Should not be possible. */
1158 abort ();
1159 case f_simple:
1160 /* A simple variable definition "var := value". Expand the value.
1161 We have to allocate memory since otherwise it'll clobber the
1162 variable buffer, and we may still need that if we're looking at a
1163 target-specific variable. */
1164 p = alloc_value = allocated_variable_expand (value);
1165 break;
1166 case f_shell:
1168 /* A shell definition "var != value". Expand value, pass it to
1169 the shell, and store the result in recursively-expanded var. */
1170 char *q = allocated_variable_expand (value);
1171 p = alloc_value = shell_result (q);
1172 free (q);
1173 flavor = f_recursive;
1174 break;
1176 case f_conditional:
1177 /* A conditional variable definition "var ?= value".
1178 The value is set IFF the variable is not defined yet. */
1179 v = lookup_variable (varname, strlen (varname));
1180 if (v)
1181 return v->special ? set_special_var (v) : v;
1183 conditional = 1;
1184 flavor = f_recursive;
1185 /* FALLTHROUGH */
1186 case f_recursive:
1187 /* A recursive variable definition "var = value".
1188 The value is used verbatim. */
1189 p = value;
1190 break;
1191 case f_append:
1193 /* If we have += but we're in a target variable context, we want to
1194 append only with other variables in the context of this target. */
1195 if (target_var)
1197 append = 1;
1198 v = lookup_variable_in_set (varname, strlen (varname),
1199 current_variable_set_list->set);
1201 /* Don't append from the global set if a previous non-appending
1202 target-specific variable definition exists. */
1203 if (v && !v->append)
1204 append = 0;
1206 else
1207 v = lookup_variable (varname, strlen (varname));
1209 if (v == 0)
1211 /* There was no old value.
1212 This becomes a normal recursive definition. */
1213 p = value;
1214 flavor = f_recursive;
1216 else
1218 /* Paste the old and new values together in VALUE. */
1220 unsigned int oldlen, vallen;
1221 const char *val;
1222 char *tp = NULL;
1224 val = value;
1225 if (v->recursive)
1226 /* The previous definition of the variable was recursive.
1227 The new value is the unexpanded old and new values. */
1228 flavor = f_recursive;
1229 else
1230 /* The previous definition of the variable was simple.
1231 The new value comes from the old value, which was expanded
1232 when it was set; and from the expanded new value. Allocate
1233 memory for the expansion as we may still need the rest of the
1234 buffer if we're looking at a target-specific variable. */
1235 val = tp = allocated_variable_expand (val);
1237 oldlen = strlen (v->value);
1238 vallen = strlen (val);
1239 p = alloc_value = xmalloc (oldlen + 1 + vallen + 1);
1240 memcpy (alloc_value, v->value, oldlen);
1241 alloc_value[oldlen] = ' ';
1242 memcpy (&alloc_value[oldlen + 1], val, vallen + 1);
1244 if (tp)
1245 free (tp);
1250 #ifdef __MSDOS__
1251 /* Many Unix Makefiles include a line saying "SHELL=/bin/sh", but
1252 non-Unix systems don't conform to this default configuration (in
1253 fact, most of them don't even have `/bin'). On the other hand,
1254 $SHELL in the environment, if set, points to the real pathname of
1255 the shell.
1256 Therefore, we generally won't let lines like "SHELL=/bin/sh" from
1257 the Makefile override $SHELL from the environment. But first, we
1258 look for the basename of the shell in the directory where SHELL=
1259 points, and along the $PATH; if it is found in any of these places,
1260 we define $SHELL to be the actual pathname of the shell. Thus, if
1261 you have bash.exe installed as d:/unix/bash.exe, and d:/unix is on
1262 your $PATH, then SHELL=/usr/local/bin/bash will have the effect of
1263 defining SHELL to be "d:/unix/bash.exe". */
1264 if ((origin == o_file || origin == o_override)
1265 && strcmp (varname, "SHELL") == 0)
1267 PATH_VAR (shellpath);
1268 extern char * __dosexec_find_on_path (const char *, char *[], char *);
1270 /* See if we can find "/bin/sh.exe", "/bin/sh.com", etc. */
1271 if (__dosexec_find_on_path (p, NULL, shellpath))
1273 char *tp;
1275 for (tp = shellpath; *tp; tp++)
1276 if (*tp == '\\')
1277 *tp = '/';
1279 v = define_variable_loc (varname, strlen (varname),
1280 shellpath, origin, flavor == f_recursive,
1281 flocp);
1283 else
1285 const char *shellbase, *bslash;
1286 struct variable *pathv = lookup_variable ("PATH", 4);
1287 char *path_string;
1288 char *fake_env[2];
1289 size_t pathlen = 0;
1291 shellbase = strrchr (p, '/');
1292 bslash = strrchr (p, '\\');
1293 if (!shellbase || bslash > shellbase)
1294 shellbase = bslash;
1295 if (!shellbase && p[1] == ':')
1296 shellbase = p + 1;
1297 if (shellbase)
1298 shellbase++;
1299 else
1300 shellbase = p;
1302 /* Search for the basename of the shell (with standard
1303 executable extensions) along the $PATH. */
1304 if (pathv)
1305 pathlen = strlen (pathv->value);
1306 path_string = xmalloc (5 + pathlen + 2 + 1);
1307 /* On MSDOS, current directory is considered as part of $PATH. */
1308 sprintf (path_string, "PATH=.;%s", pathv ? pathv->value : "");
1309 fake_env[0] = path_string;
1310 fake_env[1] = 0;
1311 if (__dosexec_find_on_path (shellbase, fake_env, shellpath))
1313 char *tp;
1315 for (tp = shellpath; *tp; tp++)
1316 if (*tp == '\\')
1317 *tp = '/';
1319 v = define_variable_loc (varname, strlen (varname),
1320 shellpath, origin,
1321 flavor == f_recursive, flocp);
1323 else
1324 v = lookup_variable (varname, strlen (varname));
1326 free (path_string);
1329 else
1330 #endif /* __MSDOS__ */
1331 #ifdef WINDOWS32
1332 if ((origin == o_file || origin == o_override || origin == o_command)
1333 && streq (varname, "SHELL"))
1335 extern char *default_shell;
1337 /* Call shell locator function. If it returns TRUE, then
1338 set no_default_sh_exe to indicate sh was found and
1339 set new value for SHELL variable. */
1341 if (find_and_set_default_shell (p))
1343 v = define_variable_in_set (varname, strlen (varname), default_shell,
1344 origin, flavor == f_recursive,
1345 (target_var
1346 ? current_variable_set_list->set
1347 : NULL),
1348 flocp);
1349 no_default_sh_exe = 0;
1351 else
1353 char *tp = alloc_value;
1355 alloc_value = allocated_variable_expand (p);
1357 if (find_and_set_default_shell (alloc_value))
1359 v = define_variable_in_set (varname, strlen (varname), p,
1360 origin, flavor == f_recursive,
1361 (target_var
1362 ? current_variable_set_list->set
1363 : NULL),
1364 flocp);
1365 no_default_sh_exe = 0;
1367 else
1368 v = lookup_variable (varname, strlen (varname));
1370 if (tp)
1371 free (tp);
1374 else
1375 #endif
1377 /* If we are defining variables inside an $(eval ...), we might have a
1378 different variable context pushed, not the global context (maybe we're
1379 inside a $(call ...) or something. Since this function is only ever
1380 invoked in places where we want to define globally visible variables,
1381 make sure we define this variable in the global set. */
1383 v = define_variable_in_set (varname, strlen (varname), p,
1384 origin, flavor == f_recursive,
1385 (target_var
1386 ? current_variable_set_list->set : NULL),
1387 flocp);
1388 v->append = append;
1389 v->conditional = conditional;
1391 if (alloc_value)
1392 free (alloc_value);
1394 return v->special ? set_special_var (v) : v;
1397 /* Parse P (a null-terminated string) as a variable definition.
1399 If it is not a variable definition, return NULL.
1401 If it is a variable definition, return a pointer to the char after the
1402 assignment token and set *FLAVOR to the type of variable assignment. */
1404 char *
1405 parse_variable_definition (const char *p, enum variable_flavor *flavor)
1407 int wspace = 0;
1409 p = next_token (p);
1411 while (1)
1413 int c = *p++;
1415 /* If we find a comment or EOS, it's not a variable definition. */
1416 if (c == '\0' || c == '#')
1417 return NULL;
1419 if (c == '$')
1421 /* This begins a variable expansion reference. Make sure we don't
1422 treat chars inside the reference as assignment tokens. */
1423 char closeparen;
1424 int count;
1425 c = *p++;
1426 if (c == '(')
1427 closeparen = ')';
1428 else if (c == '{')
1429 closeparen = '}';
1430 else
1431 /* '$$' or '$X'. Either way, nothing special to do here. */
1432 continue;
1434 /* P now points past the opening paren or brace.
1435 Count parens or braces until it is matched. */
1436 count = 0;
1437 for (; *p != '\0'; ++p)
1439 if (*p == c)
1440 ++count;
1441 else if (*p == closeparen && --count < 0)
1443 ++p;
1444 break;
1447 continue;
1450 /* If we find whitespace skip it, and remember we found it. */
1451 if (isblank ((unsigned char)c))
1453 wspace = 1;
1454 p = next_token (p);
1455 c = *p;
1456 if (c == '\0')
1457 return NULL;
1458 ++p;
1462 if (c == '=')
1464 *flavor = f_recursive;
1465 return (char *)p;
1468 /* Match assignment variants (:=, +=, ?=, !=) */
1469 if (*p == '=')
1471 switch (c)
1473 case ':':
1474 *flavor = f_simple;
1475 break;
1476 case '+':
1477 *flavor = f_append;
1478 break;
1479 case '?':
1480 *flavor = f_conditional;
1481 break;
1482 case '!':
1483 *flavor = f_shell;
1484 break;
1485 default:
1486 /* If we skipped whitespace, non-assignments means no var. */
1487 if (wspace)
1488 return NULL;
1490 /* Might be assignment, or might be $= or #=. Check. */
1491 continue;
1493 return (char *)++p;
1495 else if (c == ':')
1496 /* A colon other than := is a rule line, not a variable defn. */
1497 return NULL;
1499 /* If we skipped whitespace, non-assignments means no var. */
1500 if (wspace)
1501 return NULL;
1504 return (char *)p;
1507 /* Try to interpret LINE (a null-terminated string) as a variable definition.
1509 If LINE was recognized as a variable definition, a pointer to its `struct
1510 variable' is returned. If LINE is not a variable definition, NULL is
1511 returned. */
1513 struct variable *
1514 assign_variable_definition (struct variable *v, char *line)
1516 char *beg;
1517 char *end;
1518 enum variable_flavor flavor;
1519 char *name;
1521 beg = next_token (line);
1522 line = parse_variable_definition (beg, &flavor);
1523 if (!line)
1524 return NULL;
1526 end = line - (flavor == f_recursive ? 1 : 2);
1527 while (end > beg && isblank ((unsigned char)end[-1]))
1528 --end;
1529 line = next_token (line);
1530 v->value = line;
1531 v->flavor = flavor;
1533 /* Expand the name, so "$(foo)bar = baz" works. */
1534 name = alloca (end - beg + 1);
1535 memcpy (name, beg, end - beg);
1536 name[end - beg] = '\0';
1537 v->name = allocated_variable_expand (name);
1539 if (v->name[0] == '\0')
1540 fatal (&v->fileinfo, _("empty variable name"));
1542 return v;
1545 /* Try to interpret LINE (a null-terminated string) as a variable definition.
1547 ORIGIN may be o_file, o_override, o_env, o_env_override,
1548 or o_command specifying that the variable definition comes
1549 from a makefile, an override directive, the environment with
1550 or without the -e switch, or the command line.
1552 See the comments for assign_variable_definition().
1554 If LINE was recognized as a variable definition, a pointer to its `struct
1555 variable' is returned. If LINE is not a variable definition, NULL is
1556 returned. */
1558 struct variable *
1559 try_variable_definition (const struct floc *flocp, char *line,
1560 enum variable_origin origin, int target_var)
1562 struct variable v;
1563 struct variable *vp;
1565 if (flocp != 0)
1566 v.fileinfo = *flocp;
1567 else
1568 v.fileinfo.filenm = 0;
1570 if (!assign_variable_definition (&v, line))
1571 return 0;
1573 vp = do_variable_definition (flocp, v.name, v.value,
1574 origin, v.flavor, target_var);
1576 free (v.name);
1578 return vp;
1581 /* Print information for variable V, prefixing it with PREFIX. */
1583 static void
1584 print_variable (const void *item, void *arg)
1586 const struct variable *v = item;
1587 const char *prefix = arg;
1588 const char *origin;
1590 switch (v->origin)
1592 case o_automatic:
1593 origin = _("automatic");
1594 break;
1595 case o_default:
1596 origin = _("default");
1597 break;
1598 case o_env:
1599 origin = _("environment");
1600 break;
1601 case o_file:
1602 origin = _("makefile");
1603 break;
1604 case o_env_override:
1605 origin = _("environment under -e");
1606 break;
1607 case o_command:
1608 origin = _("command line");
1609 break;
1610 case o_override:
1611 origin = _("`override' directive");
1612 break;
1613 case o_invalid:
1614 default:
1615 abort ();
1617 fputs ("# ", stdout);
1618 fputs (origin, stdout);
1619 if (v->private_var)
1620 fputs (" private", stdout);
1621 if (v->fileinfo.filenm)
1622 printf (_(" (from `%s', line %lu)"),
1623 v->fileinfo.filenm, v->fileinfo.lineno);
1624 putchar ('\n');
1625 fputs (prefix, stdout);
1627 /* Is this a `define'? */
1628 if (v->recursive && strchr (v->value, '\n') != 0)
1629 printf ("define %s\n%s\nendef\n", v->name, v->value);
1630 else
1632 char *p;
1634 printf ("%s %s= ", v->name, v->recursive ? v->append ? "+" : "" : ":");
1636 /* Check if the value is just whitespace. */
1637 p = next_token (v->value);
1638 if (p != v->value && *p == '\0')
1639 /* All whitespace. */
1640 printf ("$(subst ,,%s)", v->value);
1641 else if (v->recursive)
1642 fputs (v->value, stdout);
1643 else
1644 /* Double up dollar signs. */
1645 for (p = v->value; *p != '\0'; ++p)
1647 if (*p == '$')
1648 putchar ('$');
1649 putchar (*p);
1651 putchar ('\n');
1656 static void
1657 print_auto_variable (const void *item, void *arg)
1659 const struct variable *v = item;
1661 if (v->origin == o_automatic)
1662 print_variable (item, arg);
1666 static void
1667 print_noauto_variable (const void *item, void *arg)
1669 const struct variable *v = item;
1671 if (v->origin != o_automatic)
1672 print_variable (item, arg);
1676 /* Print all the variables in SET. PREFIX is printed before
1677 the actual variable definitions (everything else is comments). */
1679 void
1680 print_variable_set (struct variable_set *set, char *prefix, int pauto)
1682 hash_map_arg (&set->table, (pauto ? print_auto_variable : print_variable),
1683 prefix);
1685 fputs (_("# variable set hash-table stats:\n"), stdout);
1686 fputs ("# ", stdout);
1687 hash_print_stats (&set->table, stdout);
1688 putc ('\n', stdout);
1691 /* Print the data base of variables. */
1693 void
1694 print_variable_data_base (void)
1696 puts (_("\n# Variables\n"));
1698 print_variable_set (&global_variable_set, "", 0);
1700 puts (_("\n# Pattern-specific Variable Values"));
1703 struct pattern_var *p;
1704 int rules = 0;
1706 for (p = pattern_vars; p != 0; p = p->next)
1708 ++rules;
1709 printf ("\n%s :\n", p->target);
1710 print_variable (&p->variable, "# ");
1713 if (rules == 0)
1714 puts (_("\n# No pattern-specific variable values."));
1715 else
1716 printf (_("\n# %u pattern-specific variable values"), rules);
1721 /* Print all the local variables of FILE. */
1723 void
1724 print_file_variables (const struct file *file)
1726 if (file->variables != 0)
1727 print_variable_set (file->variables->set, "# ", 1);
1730 void
1731 print_target_variables (const struct file *file)
1733 if (file->variables != 0)
1735 int l = strlen (file->name);
1736 char *t = alloca (l + 3);
1738 strcpy (t, file->name);
1739 t[l] = ':';
1740 t[l+1] = ' ';
1741 t[l+2] = '\0';
1743 hash_map_arg (&file->variables->set->table, print_noauto_variable, t);
1747 #ifdef WINDOWS32
1748 void
1749 sync_Path_environment (void)
1751 char *path = allocated_variable_expand ("$(PATH)");
1752 static char *environ_path = NULL;
1754 if (!path)
1755 return;
1758 * If done this before, don't leak memory unnecessarily.
1759 * Free the previous entry before allocating new one.
1761 if (environ_path)
1762 free (environ_path);
1765 * Create something WINDOWS32 world can grok
1767 convert_Path_to_windows32 (path, ';');
1768 environ_path = xstrdup (concat (3, "PATH", "=", path));
1769 putenv (environ_path);
1770 free (path);
1772 #endif