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
44 /* Start saving dependencies, to be written to FILENAME. If this is
45 never called, then dependency tracking is simply skipped. */
48 start_dependencies (filename
)
54 /* Noticed a new filename, so try to register it. */
57 register_dependency (filename
)
60 struct dependency
*dep
;
65 for (dep
= dep_chain
; dep
!= NULL
; dep
= dep
->next
)
67 if (!strcmp (filename
, dep
->file
))
71 dep
= (struct dependency
*) xmalloc (sizeof (struct dependency
));
72 dep
->file
= xstrdup (filename
);
73 dep
->next
= dep_chain
;
77 /* Quote a file name the way `make' wants it, and print it to FILE.
78 If FILE is NULL, do no printing, but return the length of the
81 This code is taken from gcc with only minor changes. */
84 quote_string_for_make (file
, src
)
99 /* GNU make uses a weird quoting scheme for white space.
100 A space or tab preceded by 2N+1 backslashes represents
101 N backslashes followed by space; a space or tab
102 preceded by 2N backslashes represents N backslashes at
103 the end of a file name; and backslashes in other
104 contexts should not be doubled. */
106 for (q
= p
- 1; src
< q
&& q
[-1] == '\\'; q
--)
124 /* Fall through. This can mishandle things like "$(" but
125 there's no easy fix. */
128 /* This can mishandle characters in the string "\0\n%*?[\\~";
129 exactly which chars are mishandled depends on the `make' version.
130 We know of no portable solution for this;
131 even GNU make 3.76.1 doesn't solve the problem entirely.
132 (Also, '\0' is mishandled due to our calling conventions.) */
141 /* Append some output to the file, keeping track of columns and doing
142 wrapping as necessary. */
145 wrap_output (f
, string
, spacer
)
150 int len
= quote_string_for_make (NULL
, string
);
161 fprintf (f
, " \\\n ");
173 quote_string_for_make (f
, string
);
183 /* Print dependency file. */
186 print_dependencies ()
189 struct dependency
*dep
;
191 if (dep_file
== NULL
)
194 f
= fopen (dep_file
, "w");
197 as_warn (_("Can't open `%s' for writing"), dep_file
);
202 wrap_output (f
, out_file_name
, ':');
203 for (dep
= dep_chain
; dep
!= NULL
; dep
= dep
->next
)
204 wrap_output (f
, dep
->file
, ' ');
209 as_warn (_("Can't close `%s'"), dep_file
);
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