1 /* depend.c - Handle dependency tracking.
2 Copyright (C) 1997, 1998 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to the Free
18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* The file to write to, or NULL if no dependencies being kept. */
24 static char *dep_file
= NULL
;
29 struct dependency
*next
;
32 /* All the files we depend on. */
33 static struct dependency
*dep_chain
= NULL
;
35 /* Current column in output file. */
36 static int column
= 0;
38 static int quote_string_for_make
PARAMS ((FILE *, char *));
39 static void wrap_output
PARAMS ((FILE *, char *, int));
41 /* Number of columns allowable. */
42 #define MAX_COLUMNS 72
46 /* Start saving dependencies, to be written to FILENAME. If this is
47 never called, then dependency tracking is simply skipped. */
50 start_dependencies (filename
)
56 /* Noticed a new filename, so try to register it. */
59 register_dependency (filename
)
62 struct dependency
*dep
;
67 for (dep
= dep_chain
; dep
!= NULL
; dep
= dep
->next
)
69 if (! strcmp (filename
, dep
->file
))
73 dep
= (struct dependency
*) xmalloc (sizeof (struct dependency
));
74 dep
->file
= xstrdup (filename
);
75 dep
->next
= dep_chain
;
79 /* Quote a file name the way `make' wants it, and print it to FILE.
80 If FILE is NULL, do no printing, but return the length of the
83 This code is taken from gcc with only minor changes. */
86 quote_string_for_make (file
, src
)
101 /* GNU make uses a weird quoting scheme for white space.
102 A space or tab preceded by 2N+1 backslashes represents
103 N backslashes followed by space; a space or tab
104 preceded by 2N backslashes represents N backslashes at
105 the end of a file name; and backslashes in other
106 contexts should not be doubled. */
108 for (q
= p
- 1; src
< q
&& q
[-1] == '\\'; q
--)
126 /* Fall through. This can mishandle things like "$(" but
127 there's no easy fix. */
130 /* This can mishandle characters in the string "\0\n%*?[\\~";
131 exactly which chars are mishandled depends on the `make' version.
132 We know of no portable solution for this;
133 even GNU make 3.76.1 doesn't solve the problem entirely.
134 (Also, '\0' is mishandled due to our calling conventions.) */
143 /* Append some output to the file, keeping track of columns and doing
144 wrapping as necessary. */
147 wrap_output (f
, string
, spacer
)
152 int len
= quote_string_for_make (NULL
, string
);
157 if (column
&& MAX_COLUMNS
- 1 /*spacer*/ - 2 /*` \'*/ < column
+ len
)
159 fprintf (f
, " \\\n ");
171 quote_string_for_make (f
, string
);
181 /* Print dependency file. */
184 print_dependencies ()
187 struct dependency
*dep
;
189 if (dep_file
== NULL
)
192 f
= fopen (dep_file
, "w");
195 as_warn (_("Can't open `%s' for writing"), dep_file
);
200 wrap_output (f
, out_file_name
, ':');
201 for (dep
= dep_chain
; dep
!= NULL
; dep
= dep
->next
)
202 wrap_output (f
, dep
->file
, ' ');
207 as_warn (_("Can't close `%s'"), dep_file
);
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