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1#!/bin/awk -f
2# scripts/options.awk - library build configuration control
3#
4# last changed in libpng version 1.5.7 - December 15, 2011
5#
6# Copyright (c) 1998-2011 Glenn Randers-Pehrson
7#
8# This code is released under the libpng license.
9# For conditions of distribution and use, see the disclaimer
10# and license in png.h
11
12# The output of this script is written to the file given by
13# the variable 'out'. The script is run twice, once with
14# an intermediate output file, 'options.tmp' then again on
15# that file to produce the final output:
16#
17# awk -f scripts/options.awk out=options.tmp scripts/options.dfa 1>&2
18# awk -f scripts/options.awk out=options.dfn options.tmp 1>&2
19#
20# Some options may be specified on the command line:
21#
22# deb=1 Causes debugging to be output
23# logunsupported=1 Causes all options to be recorded in the output
24# everything=off Causes all options to be disabled by default
25# everything=on Causes all options to be enabled by default
26#
27# If awk fails on your platform, try nawk instead.
28#
29# These options may also be specified in the original input file (and
30# are copied to the preprocessed file).
31
32BEGIN{
33 out="/dev/null" # intermediate, preprocessed, file
34 pre=-1 # preprocess (first line)
35 version="libpng version unknown" # version information
36 version_file="" # where to find the version
37 err=0 # in-line exit sets this
38 start="PNG_DEFN_MAGIC-" # Arbitrary start
39 end="-PNG_DEFN_END" # Arbitrary end
40 ct="PNG_JOIN" # Join two tokens
41 cx= "/" ct "*" # Open C comment for output file
42 comment=start cx # Comment start
43 cend="*/" end # Comment end
44 def=start "#define PNG_" ct # Arbitrary define
45 sup=ct "_SUPPORTED" end # end supported option
46 und=comment "#undef PNG_" ct # Unsupported option
47 une=ct "_SUPPORTED" cend # end unsupported option
48 error=start "ERROR:" # error message
49
50 # Variables
51 deb=0 # debug - set on command line
52 everything="" # do not override defaults
53 logunsupported=0 # write unsupported options too
54
55 # Precreate arrays
56 option[""] = "" # list of all options: default enabled/disabled
57 done[""] = 1 # marks option as having been output
58 requires[""] = "" # requires by option
59 iffs[""] = "" # if by option
60 enabledby[""] = "" # options that enable it by option
61 setting[""] = "" # requires by setting
62 defaults[""] = "" # used for a defaulted value
63 doneset[""] = 1 # marks setting as having been output
64 r[""] = "" # Temporary array
65
66 # For decorating the output file
67 protect = ""
68}
69
70# The output file must be specified before any input:
71out == "/dev/null" {
72 print "out=output.file must be given on the command line"
73 err = 1
74 exit 1
75}
76
77# The very first line indicates whether we are reading pre-processed
78# input or not, this must come *first* because 'PREPROCESSED' needs
79# to be the very first line in the temporary file.
80pre == -1{
81 if ($0 == "PREPROCESSED") {
82 pre = 0
83 next
84 } else {
85 pre = 1
86 print "PREPROCESSED" >out
87 # And fall through to continue processing
88 }
89}
90
91# While pre-processing if version is set to "search" look for a version string
92# in the following file.
93pre && version == "search" && version_file == ""{
94 version_file = FILENAME
95}
96
97pre && version == "search" && version_file != FILENAME{
98 print "version string not found in", version_file
99 err = 1
100 exit 1
101}
102
103pre && version == "search" && $0 ~ /^ \* libpng version/{
104 version = substr($0, 4)
105 print "version =", version >out
106 next
107}
108
109pre && FILENAME == version_file{
110 next
111}
112
113# variable=value
114# Sets the given variable to the given value (the syntax is fairly
115# free form, except for deb (you are expected to understand how to
116# set the debug variable...)
117#
118# This happens before the check on 'pre' below skips most of the
119# rest of the actions, so the variable settings happen during
120# preprocessing but are recorded in the END action too. This
121# allows them to be set on the command line too.
122$0 ~ /^[ ]*version[ ]*=/{
123 sub(/^[ ]*version[ ]*=[ ]*/, "")
124 version = $0
125 next
126}
127$0 ~ /^[ ]*everything[ =]*off[ ]*$/{
128 everything = "off"
129 next
130}
131$0 ~ /^[ ]*everything[ =]*on[ ]*$/{
132 everything = "on"
133 next
134}
135$0 ~ /^[ ]*logunsupported[ =]*0[ ]*$/{
136 logunsupported = 0
137 next
138}
139$0 ~ /^[ ]*logunsupported[ =]*1[ ]*$/{
140 logunsupported = 1
141 next
142}
143$1 == "deb" && $2 == "=" && NF == 3{
144 deb = $3
145 next
146}
147
148# Preprocessing - this just copies the input file with lines
149# that need preprocessing (just chunk at present) expanded
150# The bare "pre" instead of "pre != 0" crashes under Sunos awk
151pre && $1 != "chunk"{
152 print >out
153 next
154}
155
156# The first characters of the line determine how it is processed,
157# leading spaces are ignored. In general tokens that are not
158# keywords are the names of options. An option 'name' is
159# controlled by the definition of the corresponding macros:
160#
161# PNG_name_SUPPORTED The option is turned on
162# PNG_NO_name
163# PNG_NO_name_SUPPORTED If the first macro is not defined
164# either of these will turn the option off
165#
166# If none of these macros are defined the option is turned on, unless
167# the keyword 'off' is given in a line relating to the option. The
168# keyword 'on' can also be given, but it will be ignored (since it is
169# the default.)
170#
171# In the syntax below a 'name' is indicated by "NAME", other macro
172# values are indicated by "MACRO", as with "NAME" the leading "PNG_"
173# is omitted, but in this case the "NO_" prefix and the "_SUPPORTED"
174# suffix are never used.
175#
176# Each line is introduced by a keyword - the first non-space characters
177# on the line. A line starting with a '#' is a comment - it is totally
178# ignored. Keywords are as follows, a NAME, is simply a macro name
179# without the leading PNG_, PNG_NO_ or the trailing _SUPPORTED.
180
181$1 ~ /^#/ || $0 ~ /^[ ]*$/{
182 next
183}
184
185# com <comment>
186# The whole line is placed in the output file as a comment with
187# the preceding 'com' removed
188$1 == "com"{
189 if (NF > 1) {
190 # sub(/^[ ]*com[ ]*/, "")
191 $1 = ""
192 print comment, $0, cend >out
193 } else
194 print start end >out
195 next
196}
197
198# version
199# Inserts a version comment
200$1 == "version" && NF == 1{
201 if (version == "") {
202 print "ERROR: no version string set"
203 err = 1 # prevent END{} running
204 exit 1
205 }
206
207 print comment, version, cend >out
208 next
209}
210
211# file output input protect
212# Informational: the official name of the input file (without
213# make generated local directories), the official name of the
214# output file and, if required, a name to use in a protection
215# macro for the contents.
216$1 == "file" && NF >= 2{
217 print comment, $2, cend >out
218 print comment, "Machine generated file: DO NOT EDIT", cend >out
219 if (NF >= 3)
220 print comment, "Derived from:", $3, cend >out
221 protect = $4
222 if (protect != "") {
223 print start "#ifndef", protect end >out
224 print start "#define", protect end >out
225 }
226 next
227}
228
229# option NAME ( (requires|enables|if) NAME* | on | off | disabled )*
230# Declares an option 'NAME' and describes its default setting (disabled)
231# and its relationship to other options. The option is disabled
232# unless *all* the options listed after 'requires' are set and at
233# least one of the options listed after 'if' is set. If the
234# option is set then it turns on all the options listed after 'enables'.
235#
236# Note that "enables" takes priority over the required/if/disabled/off
237# setting of the target option.
238#
239# The definition file may list an option as 'disabled': off by default,
240# otherwise the option is enabled: on by default. A later (and it must
241# be later) entry may turn an option on or off explicitly.
242
243$1 == "option" && NF >= 2{
244 onoff = option[$2] # records current (and the default is "", enabled)
245 key = ""
246 for (i=3; i<=NF; ++i) {
247 if ($(i) == "on" || $(i) == "off" || $(i) == "disabled") {
248 key = ""
249 if (onoff != $(i)) {
250 # on or off can zap disabled or enabled:
251 if (onoff == "" || (onoff == "disabled" || onoff == "enabled") && ($(i) == "on" || $(i) == "off")) {
252 # It's easy to mis-spell the option when turning it
253 # on or off, so warn about it here:
254 if (onoff == "" && ($(i) == "on" || $(i) == "off")) {
255 print $2 ": ERROR: turning unrecognized option", $(i)
256 # For the moment error out - it is safer
257 err = 1 # prevent END{} running
258 exit 1
259 }
260 onoff = $(i)
261 } else {
262 # Print a message, otherwise the error
263 # below is incomprehensible
264 print $2 ": currently", onoff ": attempt to turn", $(i)
265 break
266 }
267 }
268 } else if ($(i) == "requires" || $(i) == "if" || $(i) == "enables") {
269 key = $(i)
270 } else if (key == "requires") {
271 requires[$2] = requires[$2] " " $(i)
272 } else if (key == "if") {
273 iffs[$2] = iffs[$2] " " $(i)
274 } else if (key == "enables") {
275 enabledby[$(i)] = enabledby[$(i)] " " $2
276 } else
277 break # bad line format
278 }
279
280 if (i > NF) {
281 # Set the option, defaulting to 'enabled'
282 if (onoff == "") onoff = "enabled"
283 option[$2] = onoff
284 next
285 }
286 # Else fall through to the error handler
287}
288
289# chunk NAME [requires OPT] [on|off|disabled]
290# Expands to the 'option' settings appropriate to the reading and
291# writing of an ancilliary PNG chunk 'NAME':
292#
293# option READ_NAME requires READ_ANCILLARY_CHUNKS [READ_OPT]
294# option READ_NAME enables NAME
295# [option READ_NAME off]
296# option WRITE_NAME requires WRITE_ANCILLARY_CHUNKS [WRITE_OPT]
297# option WRITE_NAME enables NAME
298# [option WRITE_NAME off]
299
300pre != 0 && $1 == "chunk" && NF >= 2{
301 # 'chunk' is handled on the first pass by writing appropriate
302 # 'option' lines into the intermediate file.
303 onoff = ""
304 reqread = ""
305 reqwrite = ""
306 i = 3 # indicates format error
307 if (NF > 2) {
308 # read the keywords/additional OPTS
309 req = 0
310 for (i=3; i<=NF; ++i) {
311 if ($(i) == "on" || $(i) == "off" || $(i) == "disabled") {
312 if (onoff != $(i)) {
313 if (onoff == "")
314 onoff = $(i)
315 else
316 break # on/off conflict
317 }
318 } else if ($(i) == "requires")
319 req = 1
320 else if (req != 1)
321 break # bad line: handled below
322 else {
323 reqread = reqread " READ_" $(i)
324 reqwrite = reqwrite " WRITE_" $(i)
325 }
326 }
327 }
328
329 if (i > NF) {
330 # Output new 'option' lines to the intermediate file (out)
331 print "option READ_" $2, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", $2, onoff >out
332 print "option WRITE_" $2, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", $2, onoff >out
333 next
334 }
335 # Else hit the error handler below - bad line format!
336}
337
338# setting MACRO ( requires MACRO* )* [ default VALUE ]
339# Behaves in a similar way to 'option' without looking for NO_ or
340# _SUPPORTED; the macro is enabled if it is defined so long as all
341# the 'requires' macros are also defined. The definitions may be
342# empty, an error will be issued if the 'requires' macros are
343# *not* defined. If given the 'default' value is used if the
344# macro is not defined. The default value will be re-tokenised.
345# (BTW: this is somewhat restrictive, it mainly exists for the
346# support of non-standard configurations and numeric parameters,
347# see the uses in scripts/options.dat
348
349$1 == "setting" && (NF == 2 || NF >= 3 && ($3 == "requires" || $3 == "default")){
350 reqs = ""
351 deflt = ""
352 isdef = 0
353 key = ""
354 for (i=3; i<=NF; ++i)
355 if ($(i) == "requires" || $(i) == "default") {
356 key = $(i)
357 if (key == "default") isdef = 1
358 } else if (key == "requires")
359 reqs = reqs " " $(i)
360 else if (key == "default")
361 deflt = deflt " " $(i)
362 else
363 break # Format error, handled below
364
365 setting[$2] = reqs
366 # NOTE: this overwrites a previous value silently
367 if (isdef && deflt == "")
368 deflt = " " # as a flag to force output
369 defaults[$2] = deflt
370 next
371}
372
373# The order of the dependency lines (option, chunk, setting) is irrelevant
374# - the 'enables', 'requires' and 'if' settings will be used to determine
375# the correct order in the output and the final values in pnglibconf.h are
376# not order dependent. 'requires' and 'if' entries take precedence over
377# 'enables' from other options; if an option requires another option it
378# won't be set regardless of any options that enable it unless the other
379# option is also enabled.
380#
381# Similarly 'enables' trumps a NO_ definition in CFLAGS or pngusr.h
382#
383# For simplicity cycles in the definitions are regarded as errors,
384# even if they are not ambiguous.
385# A given NAME can be specified in as many 'option' lines as required, the
386# definitions are additive.
387
388# For backwards compatibility equivalent macros may be listed thus:
389#
390# = [NO_]NAME MACRO
391# Makes -DMACRO equivalent to -DPNG_NO_NAME or -DPNG_NAME_SUPPORTED
392# as appropriate.
393#
394# The definition is injected into the C compiler input when encountered
395# in the second pass (so all these definitions appear *after* the @
396# lines!)
397#
398# 'NAME' is as above, but 'MACRO' is the full text of the equivalent
399# old, deprecated, macro.
400
401$1 == "=" && NF == 3{
402 print "#ifdef PNG_" $3 >out
403 if ($2 ~ /^NO_/)
404 print "# define PNG_" $2 >out
405 else
406 print "# define PNG_" $2 "_SUPPORTED" >out
407 print "#endif" >out
408 next
409}
410
411# Lines may be injected into the C compiler input by preceding them
412# with an "@" character. The line is copied with just the leading
413# @ removed.
414
415$1 ~ /^@/{
416 # sub(/^[ ]*@/, "")
417 $1 = substr($1, 2)
418 print >out
419 next
420}
421
422# Check for unreognized lines, because of the preprocessing chunk
423# format errors will be detected on the first pass independent of
424# any other format errors.
425{
426 print "options.awk: bad line (" NR "):", $0
427 err = 1 # prevent END{} running
428 exit 1
429}
430
431# For checking purposes names that start with "ok_" or "fail_" are
432# not output to pnglibconf.h and must be either enabled or disabled
433# respectively for the build to succeed. This allows interdependencies
434# between options of the form "at least one of" or "at most one of"
435# to be checked. For example:
436#
437# option FLOATING_POINT enables ok_math
438# option FIXED_POINT enables ok_math
439# This ensures that at least one of FLOATING_POINT and FIXED_POINT
440# must be set for the build to succeed.
441#
442# option fail_math requires FLOATING_POINT FIXED_POINT
443# This means the build will fail if *both* FLOATING_POINT and
444# FIXED_POINT are set (this is an example; in fact both are allowed.)
445#
446# If all these options were given the build would require exactly one
447# of the names to be enabled.
448
449END{
450 # END{} gets run on an exit (a traditional awk feature)
451 if (err) exit 1
452
453 if (pre) {
454 # Record the final value of the variables
455 print "deb =", deb >out
456 if (everything != "") {
457 print "everything =", everything >out
458 }
459 print "logunsupported =", logunsupported >out
460 exit 0
461 }
462
463 # Do the 'setting' values first, the algorithm the standard
464 # tree walk (O(1)) done in an O(2) while/for loop; interations
465 # settings x depth, outputing the deepest required macros
466 # first.
467 print "" >out
468 print "/* SETTINGS */" >out
469 print comment, "settings", cend >out
470 finished = 0
471 while (!finished) {
472 finished = 1
473 movement = 0 # done nothing
474 for (i in setting) if (!doneset[i]) {
475 nreqs = split(setting[i], r)
476 if (nreqs > 0) {
477 for (j=1; j<=nreqs; ++j) if (!doneset[r[j]]) {
478 break
479 }
480 if (j<=nreqs) {
481 finished = 0
482 continue # try a different setting
483 }
484 }
485
486 # All the requirements have been processed, output
487 # this setting.
488 if (deb) print "setting", i
489 print "" >out
490 print "/* setting: ", i >out
491 print " * requires:" setting[i] >out
492 print " * default: ", defaults[i], "*/" >out
493 if (defaults[i] == "") { # no default, only check if defined
494 print "#ifdef PNG_" i >out
495 }
496 for (j=1; j<=nreqs; ++j) {
497 print "# ifndef PNG_" r[j] >out
498 print error, i, "requires", r[j] end >out
499 print "# endif" >out
500 }
501 if (defaults[i] != "") { # default handling
502 print "#ifdef PNG_" i >out
503 }
504 print def i, "PNG_" i end >out
505 if (defaults[i] != "") {
506 print "#else /*default*/" >out
507 # And add the default definition for the benefit
508 # of later settings an options test:
509 print "# define PNG_" i defaults[i] >out
510 print def i defaults[i] end >out
511 }
512 print "#endif" >out
513
514 doneset[i] = 1
515 ++movement
516 }
517
518 if (!finished && !movement) {
519 print "setting: loop or missing setting in 'requires', cannot process:"
520 for (i in setting) if (!doneset[i]) {
521 print " setting", i, "requires" setting[i]
522 }
523 exit 1
524 }
525 }
526 print comment, "end of settings", cend >out
527
528 # Now do the options - somewhat more complex. The dependency
529 # tree is thus:
530 #
531 # name > name
532 # name requires name
533 # name if name
534 # name enabledby name
535 #
536 # First build a list 'tree' by option of all the things on which
537 # it depends.
538 print "" >out
539 print "/* OPTIONS */" >out
540 print comment, "options", cend >out
541 for (opt in enabledby) tree[opt] = 1 # may not be explicit options
542 for (opt in option) if (opt != "") {
543 o = option[opt]
544 # option should always be one of the following values
545 if (o != "on" && o != "off" && o != "disabled" && o != "enabled") {
546 print "internal option error (" o ")"
547 exit 1
548 }
549 tree[opt] = "" # so unlisted options marked
550 }
551 for (opt in tree) if (opt != "") {
552 if (tree[opt] == 1) {
553 tree[opt] = ""
554 if (option[opt] != "") {
555 print "internal error (1)"
556 exit 1
557 }
558 # Macros only listed in 'enables' remain off unless
559 # one of the enabling macros is on.
560 option[opt] = "disabled"
561 }
562
563 split("", list) # clear 'list'
564 # Now add every requires, iffs or enabledby entry to 'list'
565 # so that we can add a unique list of requirements to tree[i]
566 split(requires[opt] iffs[opt] enabledby[opt], r)
567 for (i in r) list[r[i]] = 1
568 for (i in list) tree[opt] = tree[opt] " " i
569 }
570
571 # print the tree for extreme debugging
572 if (deb > 2) for (i in tree) if (i != "") print i, "depends-on" tree[i]
573
574 # Ok, now check all options marked explicitly 'on' or 'off':
575 #
576 # If an option[opt] is 'on' then turn on all requires[opt]
577 # If an option[opt] is 'off' then turn off all enabledby[opt]
578 #
579 # Error out if we have to turn 'on' an 'off' option or vice versa.
580 npending = 0
581 for (opt in option) if (opt != "") {
582 if (option[opt] == "on" || option[opt] == "off") {
583 pending[++npending] = opt
584 }
585 }
586
587 err = 0 # set on error
588 while (npending > 0) {
589 opt = pending[npending--]
590 if (option[opt] == "on") {
591 nreqs = split(requires[opt], r)
592 for (j=1; j<=nreqs; ++j) {
593 if (option[r[j]] == "off") {
594 print "option", opt, "turned on, but requirement", r[j], "is turned off"
595 err = 1
596 } else if (option[r[j]] != "on") {
597 option[r[j]] = "on"
598 pending[++npending] = r[j]
599 }
600 }
601 } else {
602 if (option[opt] != "off") {
603 print "internal error (2)"
604 exit 1
605 }
606 nreqs = split(enabledby[opt], r)
607 for (j=1; j<=nreqs; ++j) {
608 if (option[r[j]] == "on") {
609 print "option", opt, "turned off, but enabled by", r[j], "which is turned on"
610 err = 1
611 } else if (option[r[j]] != "off") {
612 option[r[j]] = "off"
613 pending[++npending] = r[j]
614 }
615 }
616 }
617 }
618 if (err) exit 1
619
620 # option[i] is now the complete list of all the tokens we may
621 # need to output, go through it as above, depth first.
622 finished = 0
623 while (!finished) {
624 finished = 1
625 movement = 0 # done nothing
626 for (i in option) if (!done[i]) {
627 nreqs = split(tree[i], r)
628 if (nreqs > 0) {
629 for (j=1; j<=nreqs; ++j) if (!done[r[j]]) {
630 break
631 }
632 if (j<=nreqs) {
633 finished = 0
634 continue # next option
635 }
636 }
637
638 # All the requirements have been processed, output
639 # this option. An option is _SUPPORTED if:
640 #
641 # all 'requires' are _SUPPORTED AND
642 # at least one of the 'if' options are _SUPPORTED AND
643 # EITHER:
644 # The name is _SUPPORTED (on the command line)
645 # OR:
646 # an 'enabledby' is _SUPPORTED
647 # OR:
648 # NO_name is not defined AND
649 # the option is not disabled; an option is disabled if:
650 # option == off
651 # option == disabled && everything != on
652 # option == "" && everything == off
653 if (deb) print "option", i
654 print "" >out
655 print "/* option:", i, option[i] >out
656 print " * requires: " requires[i] >out
657 print " * if: " iffs[i] >out
658 print " * enabled-by:" enabledby[i], "*/" >out
659 print "#undef PNG_on" >out
660 print "#define PNG_on 1" >out
661
662 # requires
663 nreqs = split(requires[i], r)
664 for (j=1; j<=nreqs; ++j) {
665 print "#ifndef PNG_" r[j] "_SUPPORTED" >out
666 print "# undef PNG_on /*!" r[j] "*/" >out
667 # this error appears in the final output if something
668 # was switched 'on' but the processing above to force
669 # the requires did not work
670 if (option[i] == "on") {
671 print error, i, "requires", r[j] end >out
672 }
673 print "#endif" >out
674 }
675
676 # if
677 nreqs = split(iffs[i], r)
678 print "#undef PNG_no_if" >out
679 if (nreqs > 0) {
680 print "/* if" iffs[i], "*/" >out
681 print "#define PNG_no_if 1" >out
682 for (j=1; j<=nreqs; ++j) {
683 print "#ifdef PNG_" r[j] "_SUPPORTED" >out
684 print "# undef PNG_no_if /*" r[j] "*/" >out
685 print "#endif" >out
686 }
687 print "#ifdef PNG_no_if /*missing if*/" >out
688 print "# undef PNG_on" >out
689 # There is no checking above for this, because we
690 # don't know which 'if' to choose, so whine about
691 # it here:
692 if (option[i] == "on") {
693 print error, i, "needs one of:", iffs[i] end >out
694 }
695 print "#endif" >out
696 }
697
698 print "#ifdef PNG_on /*requires, if*/" >out
699 # enables
700 print "# undef PNG_not_enabled" >out
701 print "# define PNG_not_enabled 1" >out
702 print " /* enabled by" enabledby[i], "*/" >out
703 nreqs = split(enabledby[i], r)
704 for (j=1; j<=nreqs; ++j) {
705 print "#ifdef PNG_" r[j] "_SUPPORTED" >out
706 print "# undef PNG_not_enabled /*" r[j] "*/" >out
707 # Oops, probably not intended (should be factored
708 # out by the checks above).
709 if (option[i] == "off") {
710 print error, i, "enabled by:", r[j] end >out
711 }
712 print "#endif" >out
713 }
714
715 print "# ifndef PNG_" i "_SUPPORTED /*!command line*/" >out
716 print "# ifdef PNG_not_enabled /*!enabled*/" >out
717 if (option[i] == "off" || option[i] == "disabled" && everything != "on" || option[i] == "enabled" && everything == "off") {
718 print "# undef PNG_on /*default off*/" >out
719 } else {
720 print "# ifdef PNG_NO_" i >out
721 print "# undef PNG_on /*turned off*/" >out
722 print "# endif" >out
723 print "# ifdef PNG_NO_" i "_SUPPORTED" >out
724 print "# undef PNG_on /*turned off*/" >out
725 print "# endif" >out
726 }
727 print "# endif /*!enabled*/" >out
728 print "# ifdef PNG_on" >out
729 # The _SUPPORTED macro must be defined so that dependent
730 # options output later work.
731 print "# define PNG_" i "_SUPPORTED" >out
732 print "# endif" >out
733 print "# endif /*!command line*/" >out
734 # If PNG_on is still set the option should be defined in
735 # pnglibconf.h
736 print "# ifdef PNG_on" >out
737 if (i ~ /^fail_/) {
738 print error, i, "is on: enabled by:" iffs[i] enabledby[i] ", requires" requires[i] end >out
739 } else if (i !~ /^ok_/) {
740 print def i sup >out
741 }
742 print "# endif /* definition */" >out
743 print "#endif /*requires, if*/" >out
744 if (logunsupported || i ~ /^ok_/) {
745 print "#ifndef PNG_on" >out
746 if (logunsupported) {
747 print und i une >out
748 }
749 if (i ~ /^ok_/) {
750 print error, i, "not enabled: requires:" requires[i] ", enabled by:" iffs[i] enabledby[i] end >out
751 }
752 print "#endif" >out
753 }
754
755 done[i] = 1
756 ++movement
757 }
758
759 if (!finished && !movement) {
760 print "option: loop or missing option in dependency tree, cannot process:"
761 for (i in option) if (!done[i]) {
762 print " option", i, "depends on" tree[i], "needs:"
763 nreqs = split(tree[i], r)
764 if (nreqs > 0) for (j=1; j<=nreqs; ++j) if (!done[r[j]]) {
765 print " " r[j]
766 }
767 }
768 exit 1
769 }
770 }
771 print comment, "end of options", cend >out
772
773 # Regular end - everything looks ok
774 if (protect != "") {
775 print start "#endif", cx, protect, "*/" end >out
776 }
777}
generated by cgit v1.1 at 2024-07-12 03:58:05 +0000