2 # scripts/options.awk - library build configuration control
4 # last changed in libpng version 1.5.7 - December 15, 2011
6 # Copyright (c) 1998-2011 Glenn Randers-Pehrson
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
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:
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
20 # Some options may be specified on the command line:
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
27 # If awk fails on your platform, try nawk instead.
29 # These options may also be specified in the original input file (and
30 # are copied to the preprocessed file).
33 out="" # 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 # The following definitions prevent the C preprocessor noticing the lines
39 # that will be in the final output file. Some C preprocessors tokenise
40 # the lines, for example by inserting spaces around operators, and all
41 # C preprocessors notice lines that start with '#', most remove comments.
42 # The technique adopted here is to make the final output lines into
43 # C strings (enclosed in double quotes), preceeded by PNG_DFN. As a
44 # consequence the output cannot contain a 'raw' double quote - instead put
45 # @' in, this will be replaced by a single " afterward. See the parser
46 # script dfn.awk for more capabilities (not required here). Note that if
47 # you need a " in a 'setting' in pnglibconf.dfa it must also be @'!
48 dq="@'" # For a single double quote
49 start=" PNG_DFN \"" # Start stuff to output (can't contain a "!)
50 end="\" " # End stuff to output
51 subs="@\" " # Substitute start (substitute a C macro)
52 sube=" \"@" # Substitute end
53 comment=start "/*" # Comment start
54 cend="*/" end # Comment end
55 def=start "#define PNG_" # Arbitrary define
56 sup="_SUPPORTED" end # end supported option
57 und=comment "#undef PNG_" # Unsupported option
58 une="_SUPPORTED" cend # end unsupported option
59 error=start "ERROR:" # error message, terminate with 'end'
62 deb=0 # debug - set on command line
63 everything="" # do not override defaults
64 logunsupported=0 # write unsupported options too
68 option[""] = "" # list of all options: default enabled/disabled
69 done[""] = 1 # marks option as having been output
70 requires[""] = "" # requires by option
71 iffs[""] = "" # if by option
72 enabledby[""] = "" # options that enable it by option
73 sets[""] = "" # settings set by each option
74 setval[""] = "" # value to set (indexed: 'option sets[option]')
76 setting[""] = "" # requires by setting
77 defaults[""] = "" # used for a defaulted value
78 doneset[""] = 1 # marks setting as having been output
79 r[""] = "" # Temporary array
81 # For decorating the output file
85 # The output file must be specified before any input:
87 print "out=output.file must be given on the command line"
92 # The very first line indicates whether we are reading pre-processed
93 # input or not, this must come *first* because 'PREPROCESSED' needs
94 # to be the very first line in the temporary file.
96 if ($0 == "PREPROCESSED") {
101 print "PREPROCESSED" >out
102 # And fall through to continue processing
106 # While pre-processing if version is set to "search" look for a version string
107 # in the following file.
108 pre && version == "search" && version_file == ""{
109 version_file = FILENAME
112 pre && version == "search" && version_file != FILENAME{
113 print "version string not found in", version_file
118 pre && version == "search" && $0 ~ /^ \* libpng version/{
119 version = substr($0, 4)
120 print "version =", version >out
124 pre && FILENAME == version_file{
129 # Sets the given variable to the given value (the syntax is fairly
130 # free form, except for deb (you are expected to understand how to
131 # set the debug variable...)
133 # This happens before the check on 'pre' below skips most of the
134 # rest of the actions, so the variable settings happen during
135 # preprocessing but are recorded in the END action too. This
136 # allows them to be set on the command line too.
137 $0 ~ /^[ ]*version[ ]*=/{
138 sub(/^[ ]*version[ ]*=[ ]*/, "")
142 $0 ~ /^[ ]*everything[ =]*off[ ]*$/{
146 $0 ~ /^[ ]*everything[ =]*on[ ]*$/{
150 $0 ~ /^[ ]*logunsupported[ =]*0[ ]*$/{
154 $0 ~ /^[ ]*logunsupported[ =]*1[ ]*$/{
158 $1 == "deb" && $2 == "=" && NF == 3{
163 # Preprocessing - this just copies the input file with lines
164 # that need preprocessing (just chunk at present) expanded
165 # The bare "pre" instead of "pre != 0" crashes under Sunos awk
166 pre && $1 != "chunk"{
171 # The first characters of the line determine how it is processed,
172 # leading spaces are ignored. In general tokens that are not
173 # keywords are the names of options. An option 'name' is
174 # controlled by the definition of the corresponding macros:
176 # PNG_name_SUPPORTED The option is turned on
178 # PNG_NO_name_SUPPORTED If the first macro is not defined
179 # either of these will turn the option off
181 # If none of these macros are defined the option is turned on, unless
182 # the keyword 'off' is given in a line relating to the option. The
183 # keyword 'on' can also be given, but it will be ignored (since it is
186 # In the syntax below a 'name' is indicated by "NAME", other macro
187 # values are indicated by "MACRO", as with "NAME" the leading "PNG_"
188 # is omitted, but in this case the "NO_" prefix and the "_SUPPORTED"
189 # suffix are never used.
191 # Each line is introduced by a keyword - the first non-space characters
192 # on the line. A line starting with a '#' is a comment - it is totally
193 # ignored. Keywords are as follows, a NAME, is simply a macro name
194 # without the leading PNG_, PNG_NO_ or the trailing _SUPPORTED.
196 $1 ~ /^#/ || $0 ~ /^[ ]*$/{
201 # The whole line is placed in the output file as a comment with
202 # the preceding 'com' removed
205 # sub(/^[ ]*com[ ]*/, "")
207 print comment $0, cend >out
214 # Inserts a version comment
215 $1 == "version" && NF == 1{
217 print "ERROR: no version string set"
218 err = 1 # prevent END{} running
222 print comment, version, cend >out
226 # file output input protect
227 # Informational: the official name of the input file (without
228 # make generated local directories), the official name of the
229 # output file and, if required, a name to use in a protection
230 # macro for the contents.
231 $1 == "file" && NF >= 2{
232 print comment, $2, cend >out
233 print comment, "Machine generated file: DO NOT EDIT", cend >out
235 print comment, "Derived from:", $3, cend >out
238 print start "#ifndef", protect end >out
239 print start "#define", protect end >out
244 # option NAME ( (requires|enables|if) NAME* | on | off | disabled |
245 # sets SETTING VALUE+ )*
247 # Declares an option 'NAME' and describes its default setting (disabled)
248 # and its relationship to other options. The option is disabled
249 # unless *all* the options listed after 'requires' are set and at
250 # least one of the options listed after 'if' is set. If the
251 # option is set then it turns on all the options listed after 'enables'.
253 # Note that "enables" takes priority over the required/if/disabled/off
254 # setting of the target option.
256 # The definition file may list an option as 'disabled': off by default,
257 # otherwise the option is enabled: on by default. A later (and it must
258 # be later) entry may turn an option on or off explicitly.
260 $1 == "option" && NF >= 2{
263 onoff = option[opt] # records current (and the default is "", enabled)
267 if (istart == 1) { # continuation line
270 if (val != 1) { # error reading it
272 print "option", opt ": ERROR: missing contination line"
274 print "option", opt ": ERROR: error reading continuation line"
276 # This is a hard error
277 err = 1 # prevent END{} running
282 for (i=istart; i<=NF; ++i) {
285 if (val == "on" || val == "off" || val == "disabled" || val =="enabled") {
288 # on or off can zap disabled or enabled:
289 if (onoff == "" || (onoff == "disabled" || onoff == "enabled") &&
290 (val == "on" || val == "off")) {
291 # It's easy to mis-spell the option when turning it
292 # on or off, so warn about it here:
293 if (onoff == "" && (val == "on" || val == "off")) {
294 print "option", opt ": ERROR: turning unrecognized option", val
295 # For the moment error out - it is safer
296 err = 1 # prevent END{} running
301 # Print a message, otherwise the error
302 # below is incomprehensible
303 print "option", opt ": currently", onoff ": attempt to turn", val
307 } else if (val == "requires" || val == "if" || val == "enables" || val =="sets") {
309 } else if (key == "requires") {
310 requires[opt] = requires[opt] " " val
311 } else if (key == "if") {
312 iffs[opt] = iffs[opt] " " val
313 } else if (key == "enables") {
314 enabledby[val] = enabledby[val] " " opt
315 } else if (key == "sets") {
316 sets[opt] = sets[opt] " " val
319 } else if (key == "setval") {
320 setval[opt " " set] = setval[opt " " set] " " val
322 break # bad line format
326 } while (i > NF && $0 ~ /,$/)
329 # Set the option, defaulting to 'enabled'
330 if (onoff == "") onoff = "enabled"
334 # Else fall through to the error handler
337 # chunk NAME [requires OPT] [enables LIST] [on|off|disabled]
338 # Expands to the 'option' settings appropriate to the reading and
339 # writing of an ancilliary PNG chunk 'NAME':
341 # option READ_NAME requires READ_ANCILLARY_CHUNKS [READ_OPT]
342 # option READ_NAME enables NAME LIST
343 # [option READ_NAME off]
344 # option WRITE_NAME requires WRITE_ANCILLARY_CHUNKS [WRITE_OPT]
345 # option WRITE_NAME enables NAME LIST
346 # [option WRITE_NAME off]
348 pre != 0 && $1 == "chunk" && NF >= 2{
349 # 'chunk' is handled on the first pass by writing appropriate
350 # 'option' lines into the intermediate file.
360 if (istart == 1) { # continuation line
363 if (val != 1) { # error reading it
365 print "chunk", opt ": ERROR: missing contination line"
367 print "chunk", opt ": ERROR: error reading continuation line"
369 # This is a hard error
370 err = 1 # prevent END{} running
375 # read the keywords/additional OPTS
376 for (i=istart; i<=NF; ++i) {
379 if (val == "on" || val == "off" || val == "disabled") {
384 break # on/off conflict
387 } else if (val == "requires")
389 else if (val == "enables")
392 reqread = reqread " READ_" val
393 reqwrite = reqwrite " WRITE_" val
395 enables = enables " " val
397 break # bad line: handled below
401 } while (i > NF && $0 ~ /,$/)
404 # Output new 'option' lines to the intermediate file (out)
405 print "option READ_" opt, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", opt enables , onoff >out
406 print "option WRITE_" opt, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", opt enables, onoff >out
409 # Else hit the error handler below - bad line format!
412 # setting MACRO ( requires MACRO* )* [ default VALUE ]
413 # Behaves in a similar way to 'option' without looking for NO_ or
414 # _SUPPORTED; the macro is enabled if it is defined so long as all
415 # the 'requires' macros are also defined. The definitions may be
416 # empty, an error will be issued if the 'requires' macros are
417 # *not* defined. If given the 'default' value is used if the
418 # macro is not defined. The default value will be re-tokenised.
419 # (BTW: this is somewhat restrictive, it mainly exists for the
420 # support of non-standard configurations and numeric parameters,
421 # see the uses in scripts/options.dat
423 $1 == "setting" && (NF == 2 || NF >= 3 && ($3 == "requires" || $3 == "default")){
428 for (i=3; i<=NF; ++i)
429 if ($(i) == "requires" || $(i) == "default") {
431 if (key == "default") isdef = 1
432 } else if (key == "requires")
434 else if (key == "default")
435 deflt = deflt " " $(i)
437 break # Format error, handled below
440 # NOTE: this overwrites a previous value silently
441 if (isdef && deflt == "")
442 deflt = " " # as a flag to force output
447 # The order of the dependency lines (option, chunk, setting) is irrelevant
448 # - the 'enables', 'requires' and 'if' settings will be used to determine
449 # the correct order in the output and the final values in pnglibconf.h are
450 # not order dependent. 'requires' and 'if' entries take precedence over
451 # 'enables' from other options; if an option requires another option it
452 # won't be set regardless of any options that enable it unless the other
453 # option is also enabled.
455 # Similarly 'enables' trumps a NO_ definition in CFLAGS or pngusr.h
457 # For simplicity cycles in the definitions are regarded as errors,
458 # even if they are not ambiguous.
459 # A given NAME can be specified in as many 'option' lines as required, the
460 # definitions are additive.
462 # For backwards compatibility equivalent macros may be listed thus:
465 # Makes -DMACRO equivalent to -DPNG_NO_NAME or -DPNG_NAME_SUPPORTED
468 # The definition is injected into the C compiler input when encountered
469 # in the second pass (so all these definitions appear *after* the @
472 # 'NAME' is as above, but 'MACRO' is the full text of the equivalent
473 # old, deprecated, macro.
475 $1 == "=" && NF == 3{
476 print "#ifdef PNG_" $3 >out
478 print "# define PNG_" $2 >out
480 print "# define PNG_" $2 "_SUPPORTED" >out
485 # Lines may be injected into the C compiler input by preceding them
486 # with an "@" character. The line is copied with just the leading
496 # Check for unreognized lines, because of the preprocessing chunk
497 # format errors will be detected on the first pass independent of
498 # any other format errors.
500 print "options.awk: bad line (" NR "):", $0
501 err = 1 # prevent END{} running
505 # For checking purposes names that start with "ok_" or "fail_" are
506 # not output to pnglibconf.h and must be either enabled or disabled
507 # respectively for the build to succeed. This allows interdependencies
508 # between options of the form "at least one of" or "at most one of"
509 # to be checked. For example:
511 # option FLOATING_POINT enables ok_math
512 # option FIXED_POINT enables ok_math
513 # This ensures that at least one of FLOATING_POINT and FIXED_POINT
514 # must be set for the build to succeed.
516 # option fail_math requires FLOATING_POINT FIXED_POINT
517 # This means the build will fail if *both* FLOATING_POINT and
518 # FIXED_POINT are set (this is an example; in fact both are allowed.)
520 # If all these options were given the build would require exactly one
521 # of the names to be enabled.
524 # END{} gets run on an exit (a traditional awk feature)
528 # Record the final value of the variables
529 print "deb =", deb >out
530 if (everything != "") {
531 print "everything =", everything >out
533 print "logunsupported =", logunsupported >out
537 # Do the options first (allowing options to set settings). The dependency
543 # name enabledby name
545 # First build a list 'tree' by option of all the things on which
548 print "/* OPTIONS */" >out
549 print comment, "options", cend >out
550 for (opt in enabledby) tree[opt] = 1 # may not be explicit options
551 for (opt in option) if (opt != "") {
553 # option should always be one of the following values
554 if (o != "on" && o != "off" && o != "disabled" && o != "enabled") {
555 print "internal option error (" o ")"
558 tree[opt] = "" # so unlisted options marked
560 for (opt in tree) if (opt != "") {
561 if (tree[opt] == 1) {
563 if (option[opt] != "") {
564 print "internal error (1)"
567 # Macros only listed in 'enables' remain off unless
568 # one of the enabling macros is on.
569 option[opt] = "disabled"
572 split("", list) # clear 'list'
573 # Now add every requires, iffs or enabledby entry to 'list'
574 # so that we can add a unique list of requirements to tree[i]
575 split(requires[opt] iffs[opt] enabledby[opt], r)
576 for (i in r) list[r[i]] = 1
577 for (i in list) tree[opt] = tree[opt] " " i
580 # print the tree for extreme debugging
581 if (deb > 2) for (i in tree) if (i != "") print i, "depends-on" tree[i]
583 # Ok, now check all options marked explicitly 'on' or 'off':
585 # If an option[opt] is 'on' then turn on all requires[opt]
586 # If an option[opt] is 'off' then turn off all enabledby[opt]
588 # Error out if we have to turn 'on' an 'off' option or vice versa.
590 for (opt in option) if (opt != "") {
591 if (option[opt] == "on" || option[opt] == "off") {
592 pending[++npending] = opt
596 err = 0 # set on error
597 while (npending > 0) {
598 opt = pending[npending--]
599 if (option[opt] == "on") {
600 nreqs = split(requires[opt], r)
601 for (j=1; j<=nreqs; ++j) {
602 if (option[r[j]] == "off") {
603 print "option", opt, "turned on, but requirement", r[j], "is turned off"
605 } else if (option[r[j]] != "on") {
607 pending[++npending] = r[j]
611 if (option[opt] != "off") {
612 print "internal error (2)"
615 nreqs = split(enabledby[opt], r)
616 for (j=1; j<=nreqs; ++j) {
617 if (option[r[j]] == "on") {
618 print "option", opt, "turned off, but enabled by", r[j], "which is turned on"
620 } else if (option[r[j]] != "off") {
622 pending[++npending] = r[j]
630 print "PNG_DFN_START_SORT 2" >out
632 # option[i] is now the complete list of all the tokens we may
633 # need to output, go through it as above, depth first.
637 movement = 0 # done nothing
638 for (i in option) if (!done[i]) {
639 nreqs = split(tree[i], r)
641 for (j=1; j<=nreqs; ++j) if (!done[r[j]]) {
646 continue # next option
650 # All the requirements have been processed, output
651 # this option. An option is _SUPPORTED if:
653 # all 'requires' are _SUPPORTED AND
654 # at least one of the 'if' options are _SUPPORTED AND
656 # The name is _SUPPORTED (on the command line)
658 # an 'enabledby' is _SUPPORTED
660 # NO_name is not defined AND
661 # the option is not disabled; an option is disabled if:
663 # option == disabled && everything != on
664 # option == "" && everything == off
665 if (deb) print "option", i
667 print "/* option:", i, option[i] >out
668 print " * requires: " requires[i] >out
669 print " * if: " iffs[i] >out
670 print " * enabled-by:" enabledby[i] >out
671 print " * sets: " sets[i], "*/" >out
672 print "#undef PNG_on" >out
673 print "#define PNG_on 1" >out
676 nreqs = split(requires[i], r)
677 for (j=1; j<=nreqs; ++j) {
678 print "#ifndef PNG_" r[j] "_SUPPORTED" >out
679 print "# undef PNG_on /*!" r[j] "*/" >out
680 # this error appears in the final output if something
681 # was switched 'on' but the processing above to force
682 # the requires did not work
683 if (option[i] == "on") {
684 print error, i, "requires", r[j] end >out
691 nreqs = split(iffs[i], r)
692 print "#undef PNG_no_if" >out
695 print "/* if" iffs[i], "*/" >out
696 print "#define PNG_no_if 1" >out
697 for (j=1; j<=nreqs; ++j) {
698 print "#ifdef PNG_" r[j] "_SUPPORTED" >out
699 print "# undef PNG_no_if /*" r[j] "*/" >out
702 print "#ifdef PNG_no_if /*missing if*/" >out
703 print "# undef PNG_on" >out
704 # There is no checking above for this, because we
705 # don't know which 'if' to choose, so whine about
707 if (option[i] == "on") {
708 print error, i, "needs one of:", iffs[i] end >out
713 print "#ifdef PNG_on /*requires, if*/" >out
715 print "# undef PNG_not_enabled" >out
716 print "# define PNG_not_enabled 1" >out
717 print " /* enabled by" enabledby[i], "*/" >out
718 nreqs = split(enabledby[i], r)
719 for (j=1; j<=nreqs; ++j) {
720 print "#ifdef PNG_" r[j] "_SUPPORTED" >out
721 print "# undef PNG_not_enabled /*" r[j] "*/" >out
722 # Oops, probably not intended (should be factored
723 # out by the checks above).
724 if (option[i] == "off") {
725 print error, i, "enabled by:", r[j] end >out
730 print "# ifndef PNG_" i "_SUPPORTED /*!command line*/" >out
731 print "# ifdef PNG_not_enabled /*!enabled*/" >out
732 # 'have_ifs' here means that everything = "off" still allows an 'if' on
733 # an otherwise enabled option to turn it on; otherwise the 'if'
734 # handling is effectively disabled by 'everything = off'
735 if (option[i] == "off" || option[i] == "disabled" && everything != "on" || option[i] == "enabled" && everything == "off" && !have_ifs) {
736 print "# undef PNG_on /*default off*/" >out
738 print "# ifdef PNG_NO_" i >out
739 print "# undef PNG_on /*turned off*/" >out
741 print "# ifdef PNG_NO_" i "_SUPPORTED" >out
742 print "# undef PNG_on /*turned off*/" >out
745 print "# endif /*!enabled*/" >out
746 print "# ifdef PNG_on" >out
747 # The _SUPPORTED macro must be defined so that dependent
748 # options output later work.
749 print "# define PNG_" i "_SUPPORTED" >out
751 print "# endif /*!command line*/" >out
752 # If PNG_on is still set the option should be defined in
754 print "# ifdef PNG_on" >out
756 print error, i, "is on: enabled by:" iffs[i] enabledby[i] ", requires" requires[i] end >out
757 } else if (i !~ /^ok_/) {
759 # Supported option, set required settings
760 nreqs = split(sets[i], r)
761 for (j=1; j<=nreqs; ++j) {
762 print "# ifdef PNG_set_" r[j] >out
763 # Some other option has already set a value:
764 print error, i, "sets", r[j] ": duplicate setting" end >out
765 print error, " previous value: " end "PNG_set_" r[j] >out
767 # Else set the default: note that this won't accept arbitrary
768 # values, the setval string must be acceptable to all the C
769 # compilers we use. That means it must be VERY simple; a number,
770 # a name or a string.
771 print "# define PNG_set_" r[j], setval[i " " r[j]] >out
775 print "# endif /* definition */" >out
776 print "#endif /*requires, if*/" >out
777 if (logunsupported || i ~ /^ok_/) {
778 print "#ifndef PNG_on" >out
779 if (logunsupported) {
783 print error, i, "not enabled: requires:" requires[i] ", enabled by:" iffs[i] enabledby[i] end >out
792 if (!finished && !movement) {
793 print "option: loop or missing option in dependency tree, cannot process:"
794 for (i in option) if (!done[i]) {
795 print " option", i, "depends on" tree[i], "needs:"
796 nreqs = split(tree[i], r)
797 if (nreqs > 0) for (j=1; j<=nreqs; ++j) if (!done[r[j]]) {
804 print "PNG_DFN_END_SORT" >out
805 print comment, "end of options", cend >out
807 # Do the 'setting' values second, the algorithm the standard
808 # tree walk (O(1)) done in an O(2) while/for loop; interations
809 # settings x depth, outputing the deepest required macros
812 print "/* SETTINGS */" >out
813 print comment, "settings", cend >out
814 # Sort (in dfn.awk) on field 2, the setting name
815 print "PNG_DFN_START_SORT 2" >out
819 movement = 0 # done nothing
820 for (i in setting) if (!doneset[i]) {
821 nreqs = split(setting[i], r)
823 # By default assume the requires values are options, but if there
824 # is no option with that name check for a setting
825 for (j=1; j<=nreqs; ++j) if (option[r[j]] == "" && !doneset[r[j]]) {
830 continue # try a different setting
834 # All the requirements have been processed, output
836 if (deb) print "setting", i
838 # Remove any spurious trailing spaces
840 # A leading @ means leave it unquoted so the preprocessor
841 # can substitute the build time value
843 deflt = " " subs substr(deflt, 3) sube
845 print "/* setting: ", i >out
846 print " * requires:" setting[i] >out
847 print " * default: ", defaults[i] deflt, "*/" >out
848 for (j=1; j<=nreqs; ++j) {
849 if (option[r[j]] != "")
850 print "#ifndef PNG_" r[j] "_SUPPORTED" >out
852 print "#ifndef PNG_" r[j] >out
853 print error, i, "requires", r[j] end >out
858 # 1) External definition; trumps:
859 # 2) Option 'sets' value; trumps:
860 # 3) Setting 'default'
862 print "#ifdef PNG_" i >out
863 # PNG_<i> is defined, so substitute the value:
864 print def i, subs "PNG_" i sube end >out
865 print "#else /* use default */" >out
866 print "# ifdef PNG_set_" i >out
867 # Value from an option 'sets' argument
868 print def i, subs "PNG_set_" i sube end >out
869 # This is so that subsequent tests on the setting work:
870 print "# define PNG_" i, "1" >out
871 if (defaults[i] != "") {
872 print "# else /*default*/" >out
873 print def i deflt end >out
874 print "# define PNG_" i, "1" >out
876 print "# endif /* defaults */" >out
877 print "#endif /* setting", i, "*/" >out
883 if (!finished && !movement) {
884 print "setting: loop or missing setting in 'requires', cannot process:"
885 for (i in setting) if (!doneset[i]) {
886 print " setting", i, "requires" setting[i]
891 print "PNG_DFN_END_SORT" >out
892 print comment, "end of settings", cend >out
894 # Regular end - everything looks ok
896 print start "#endif", "/*", protect, "*/" end >out