| #!/bin/awk -f |
| |
| # scripts/options.awk - library build configuration control |
| # |
| # Copyright (c) 1998-2014 Glenn Randers-Pehrson |
| # |
| # This code is released under the libpng license. |
| # For conditions of distribution and use, see the disclaimer |
| # and license in png.h |
| |
| # The output of this script is written to the file given by |
| # the variable 'out'. The script is run twice, once with |
| # an intermediate output file, 'options.tmp' then again on |
| # that file to produce the final output: |
| # |
| # awk -f scripts/options.awk out=options.tmp scripts/options.dfa 1>&2 |
| # awk -f scripts/options.awk out=options.dfn options.tmp 1>&2 |
| # |
| # Some options may be specified on the command line: |
| # |
| # deb=1 Causes debugging to be output |
| # logunsupported=1 Causes all options to be recorded in the output |
| # everything=off Causes all options to be disabled by default |
| # everything=on Causes all options to be enabled by default |
| # |
| # If awk fails on your platform, try nawk instead. |
| # |
| # These options may also be specified in the original input file (and |
| # are copied to the preprocessed file). |
| |
| BEGIN{ |
| out="" # intermediate, preprocessed, file |
| pre=-1 # preprocess (first line) |
| version="libpng version unknown" # version information |
| version_file="" # where to find the version |
| err=0 # in-line exit sets this |
| # The following definitions prevent the C preprocessor noticing the lines |
| # that will be in the final output file. Some C preprocessors tokenise |
| # the lines, for example by inserting spaces around operators, and all |
| # C preprocessors notice lines that start with '#', most remove comments. |
| # The technique adopted here is to make the final output lines into |
| # C strings (enclosed in double quotes), preceded by PNG_DFN. As a |
| # consequence the output cannot contain a 'raw' double quote - instead put |
| # @' in, this will be replaced by a single " afterward. See the parser |
| # script dfn.awk for more capabilities (not required here). Note that if |
| # you need a " in a 'setting' in pnglibconf.dfa it must also be @'! |
| dq="@'" # For a single double quote |
| start=" PNG_DFN \"" # Start stuff to output (can't contain a "!) |
| end="\" " # End stuff to output |
| subs="@\" " # Substitute start (substitute a C macro) |
| sube=" \"@" # Substitute end |
| comment=start "/*" # Comment start |
| cend="*/" end # Comment end |
| def=start "#define PNG_" # Arbitrary define |
| sup="_SUPPORTED" end # end supported option |
| und=comment "#undef PNG_" # Unsupported option |
| une="_SUPPORTED" cend # end unsupported option |
| error=start "ERROR:" # error message, terminate with 'end' |
| |
| # Variables |
| deb=0 # debug - set on command line |
| everything="" # do not override defaults |
| logunsupported=0 # write unsupported options too |
| |
| # Precreate arrays |
| # for each option: |
| option[""] = "" # list of all options: default enabled/disabled |
| done[""] = 1 # marks option as having been output |
| requires[""] = "" # requires by option |
| iffs[""] = "" # if by option |
| enabledby[""] = "" # options that enable it by option |
| sets[""] = "" # settings set by each option |
| setval[""] = "" # value to set (indexed: 'option sets[option]') |
| # for each setting: |
| setting[""] = "" # requires by setting |
| defaults[""] = "" # used for a defaulted value |
| doneset[""] = 1 # marks setting as having been output |
| r[""] = "" # Temporary array |
| |
| # For decorating the output file |
| protect = "" |
| } |
| |
| # The output file must be specified before any input: |
| out == "" { |
| print "out=output.file must be given on the command line" |
| err = 1 |
| exit 1 |
| } |
| |
| # The very first line indicates whether we are reading pre-processed |
| # input or not, this must come *first* because 'PREPROCESSED' needs |
| # to be the very first line in the temporary file. |
| pre == -1{ |
| if ($0 == "PREPROCESSED") { |
| pre = 0 |
| next |
| } else { |
| pre = 1 |
| print "PREPROCESSED" >out |
| # And fall through to continue processing |
| } |
| } |
| |
| # While pre-processing if version is set to "search" look for a version string |
| # in the following file. |
| pre && version == "search" && version_file == ""{ |
| version_file = FILENAME |
| } |
| |
| pre && version == "search" && version_file != FILENAME{ |
| print "version string not found in", version_file |
| err = 1 |
| exit 1 |
| } |
| |
| pre && version == "search" && $0 ~ /^ \* libpng version/{ |
| version = substr($0, 4) |
| print "version =", version >out |
| next |
| } |
| |
| pre && FILENAME == version_file{ |
| next |
| } |
| |
| # variable=value |
| # Sets the given variable to the given value (the syntax is fairly |
| # free form, except for deb (you are expected to understand how to |
| # set the debug variable...) |
| # |
| # This happens before the check on 'pre' below skips most of the |
| # rest of the actions, so the variable settings happen during |
| # preprocessing but are recorded in the END action too. This |
| # allows them to be set on the command line too. |
| $0 ~ /^[ ]*version[ ]*=/{ |
| sub(/^[ ]*version[ ]*=[ ]*/, "") |
| version = $0 |
| next |
| } |
| $0 ~ /^[ ]*everything[ =]*off[ ]*$/{ |
| everything = "off" |
| next |
| } |
| $0 ~ /^[ ]*everything[ =]*on[ ]*$/{ |
| everything = "on" |
| next |
| } |
| $0 ~ /^[ ]*logunsupported[ =]*0[ ]*$/{ |
| logunsupported = 0 |
| next |
| } |
| $0 ~ /^[ ]*logunsupported[ =]*1[ ]*$/{ |
| logunsupported = 1 |
| next |
| } |
| $1 == "deb" && $2 == "=" && NF == 3{ |
| deb = $3 |
| next |
| } |
| |
| # Preprocessing - this just copies the input file with lines |
| # that need preprocessing (just chunk at present) expanded |
| # The bare "pre" instead of "pre != 0" crashes under Sunos awk |
| pre && $1 != "chunk"{ |
| print >out |
| next |
| } |
| |
| # The first characters of the line determine how it is processed, |
| # leading spaces are ignored. In general tokens that are not |
| # keywords are the names of options. An option 'name' is |
| # controlled by the definition of the corresponding macros: |
| # |
| # PNG_name_SUPPORTED The option is turned on |
| # PNG_NO_name |
| # PNG_NO_name_SUPPORTED If the first macro is not defined |
| # either of these will turn the option off |
| # |
| # If none of these macros are defined the option is turned on, unless |
| # the keyword 'off' is given in a line relating to the option. The |
| # keyword 'on' can also be given, but it will be ignored (since it is |
| # the default.) |
| # |
| # In the syntax below a 'name' is indicated by "NAME", other macro |
| # values are indicated by "MACRO", as with "NAME" the leading "PNG_" |
| # is omitted, but in this case the "NO_" prefix and the "_SUPPORTED" |
| # suffix are never used. |
| # |
| # Each line is introduced by a keyword - the first non-space characters |
| # on the line. A line starting with a '#' is a comment - it is totally |
| # ignored. Keywords are as follows, a NAME, is simply a macro name |
| # without the leading PNG_, PNG_NO_ or the trailing _SUPPORTED. |
| |
| $1 ~ /^#/ || $0 ~ /^[ ]*$/{ |
| next |
| } |
| |
| # com <comment> |
| # The whole line is placed in the output file as a comment with |
| # the preceding 'com' removed |
| $1 == "com"{ |
| if (NF > 1) { |
| # sub(/^[ ]*com[ ]*/, "") |
| $1 = "" |
| print comment $0, cend >out |
| } else |
| print start end >out |
| next |
| } |
| |
| # version |
| # Inserts a version comment |
| $1 == "version" && NF == 1{ |
| if (version == "") { |
| print "ERROR: no version string set" |
| err = 1 # prevent END{} running |
| exit 1 |
| } |
| |
| print comment, version, cend >out |
| next |
| } |
| |
| # file output input protect |
| # Informational: the official name of the input file (without |
| # make generated local directories), the official name of the |
| # output file and, if required, a name to use in a protection |
| # macro for the contents. |
| $1 == "file" && NF >= 2{ |
| print comment, $2, cend >out |
| print comment, "Machine generated file: DO NOT EDIT", cend >out |
| if (NF >= 3) |
| print comment, "Derived from:", $3, cend >out |
| protect = $4 |
| if (protect != "") { |
| print start "#ifndef", protect end >out |
| print start "#define", protect end >out |
| } |
| next |
| } |
| |
| # option NAME ( (requires|enables|if) NAME* | on | off | disabled | |
| # sets SETTING VALUE+ )* |
| # |
| # Declares an option 'NAME' and describes its default setting (disabled) |
| # and its relationship to other options. The option is disabled |
| # unless *all* the options listed after 'requires' are set and at |
| # least one of the options listed after 'if' is set. If the |
| # option is set then it turns on all the options listed after 'enables'. |
| # |
| # Note that "enables" takes priority over the required/if/disabled/off |
| # setting of the target option. |
| # |
| # The definition file may list an option as 'disabled': off by default, |
| # otherwise the option is enabled: on by default. A later (and it must |
| # be later) entry may turn an option on or off explicitly. |
| |
| $1 == "option" && NF >= 2{ |
| opt = $2 |
| sub(/,$/,"",opt) |
| onoff = option[opt] # records current (and the default is "", enabled) |
| key = "" |
| istart = 3 |
| do { |
| if (istart == 1) { # continuation line |
| val = getline |
| |
| if (val != 1) { # error reading it |
| if (val == 0) |
| print "option", opt ": ERROR: missing continuation line" |
| else |
| print "option", opt ": ERROR: error reading continuation line" |
| |
| # This is a hard error |
| err = 1 # prevent END{} running |
| exit 1 |
| } |
| } |
| |
| for (i=istart; i<=NF; ++i) { |
| val=$(i) |
| sub(/,$/,"",val) |
| if (val == "on" || val == "off" || val == "disabled" || val =="enabled") { |
| key = "" |
| if (onoff != val) { |
| # on or off can zap disabled or enabled: |
| if (onoff == "" || (onoff == "disabled" || onoff == "enabled") && |
| (val == "on" || val == "off")) { |
| # It's easy to mis-spell the option when turning it |
| # on or off, so warn about it here: |
| if (onoff == "" && (val == "on" || val == "off")) { |
| print "option", opt ": ERROR: turning unrecognized option", val |
| # For the moment error out - it is safer |
| err = 1 # prevent END{} running |
| exit 1 |
| } |
| onoff = val |
| } else { |
| # Print a message, otherwise the error |
| # below is incomprehensible |
| print "option", opt ": currently", onoff ": attempt to turn", val |
| break |
| } |
| } |
| } else if (val == "requires" || val == "if" || val == "enables" || val =="sets") { |
| key = val |
| } else if (key == "requires") { |
| requires[opt] = requires[opt] " " val |
| } else if (key == "if") { |
| iffs[opt] = iffs[opt] " " val |
| } else if (key == "enables") { |
| enabledby[val] = enabledby[val] " " opt |
| } else if (key == "sets") { |
| sets[opt] = sets[opt] " " val |
| key = "setval" |
| set = val |
| } else if (key == "setval") { |
| setval[opt " " set] = setval[opt " " set] " " val |
| } else |
| break # bad line format |
| } |
| |
| istart = 1 |
| } while (i > NF && $0 ~ /,$/) |
| |
| if (i > NF) { |
| # Set the option, defaulting to 'enabled' |
| if (onoff == "") onoff = "enabled" |
| option[opt] = onoff |
| next |
| } |
| # Else fall through to the error handler |
| } |
| |
| # chunk NAME [requires OPT] [enables LIST] [on|off|disabled] |
| # Expands to the 'option' settings appropriate to the reading and |
| # writing of an ancillary PNG chunk 'NAME': |
| # |
| # option READ_NAME requires READ_ANCILLARY_CHUNKS [READ_OPT] |
| # option READ_NAME enables NAME LIST |
| # [option READ_NAME off] |
| # option WRITE_NAME requires WRITE_ANCILLARY_CHUNKS [WRITE_OPT] |
| # option WRITE_NAME enables NAME LIST |
| # [option WRITE_NAME off] |
| |
| pre != 0 && $1 == "chunk" && NF >= 2{ |
| # 'chunk' is handled on the first pass by writing appropriate |
| # 'option' lines into the intermediate file. |
| opt = $2 |
| sub(/,$/,"",opt) |
| onoff = "" |
| reqread = "" |
| reqwrite = "" |
| enables = "" |
| req = 0 |
| istart = 3 |
| do { |
| if (istart == 1) { # continuation line |
| val = getline |
| |
| if (val != 1) { # error reading it |
| if (val == 0) |
| print "chunk", opt ": ERROR: missing continuation line" |
| else |
| print "chunk", opt ": ERROR: error reading continuation line" |
| |
| # This is a hard error |
| err = 1 # prevent END{} running |
| exit 1 |
| } |
| } |
| |
| # read the keywords/additional OPTS |
| for (i=istart; i<=NF; ++i) { |
| val = $(i) |
| sub(/,$/,"",val) |
| if (val == "on" || val == "off" || val == "disabled") { |
| if (onoff != val) { |
| if (onoff == "") |
| onoff = val |
| else |
| break # on/off conflict |
| } |
| req = 0 |
| } else if (val == "requires") |
| req = 1 |
| else if (val == "enables") |
| req = 2 |
| else if (req == 1){ |
| reqread = reqread " READ_" val |
| reqwrite = reqwrite " WRITE_" val |
| } else if (req == 2) |
| enables = enables " " val |
| else |
| break # bad line: handled below |
| } |
| |
| istart = 1 |
| } while (i > NF && $0 ~ /,$/) |
| |
| if (i > NF) { |
| # Output new 'option' lines to the intermediate file (out) |
| print "option READ_" opt, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", opt enables , onoff >out |
| print "option WRITE_" opt, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", opt enables, onoff >out |
| next |
| } |
| # Else hit the error handler below - bad line format! |
| } |
| |
| # setting MACRO ( requires MACRO* )* [ default VALUE ] |
| # Behaves in a similar way to 'option' without looking for NO_ or |
| # _SUPPORTED; the macro is enabled if it is defined so long as all |
| # the 'requires' macros are also defined. The definitions may be |
| # empty, an error will be issued if the 'requires' macros are |
| # *not* defined. If given the 'default' value is used if the |
| # macro is not defined. The default value will be re-tokenised. |
| # (BTW: this is somewhat restrictive, it mainly exists for the |
| # support of non-standard configurations and numeric parameters, |
| # see the uses in scripts/options.dat |
| |
| $1 == "setting" && (NF == 2 || NF >= 3 && ($3 == "requires" || $3 == "default")){ |
| reqs = "" |
| deflt = "" |
| isdef = 0 |
| key = "" |
| for (i=3; i<=NF; ++i) |
| if ($(i) == "requires" || $(i) == "default") { |
| key = $(i) |
| if (key == "default") isdef = 1 |
| } else if (key == "requires") |
| reqs = reqs " " $(i) |
| else if (key == "default") |
| deflt = deflt " " $(i) |
| else |
| break # Format error, handled below |
| |
| setting[$2] = reqs |
| # NOTE: this overwrites a previous value silently |
| if (isdef && deflt == "") |
| deflt = " " # as a flag to force output |
| defaults[$2] = deflt |
| next |
| } |
| |
| # The order of the dependency lines (option, chunk, setting) is irrelevant |
| # - the 'enables', 'requires' and 'if' settings will be used to determine |
| # the correct order in the output and the final values in pnglibconf.h are |
| # not order dependent. 'requires' and 'if' entries take precedence over |
| # 'enables' from other options; if an option requires another option it |
| # won't be set regardless of any options that enable it unless the other |
| # option is also enabled. |
| # |
| # Similarly 'enables' trumps a NO_ definition in CFLAGS or pngusr.h |
| # |
| # For simplicity cycles in the definitions are regarded as errors, |
| # even if they are not ambiguous. |
| # A given NAME can be specified in as many 'option' lines as required, the |
| # definitions are additive. |
| |
| # For backwards compatibility equivalent macros may be listed thus: |
| # |
| # = [NO_]NAME MACRO |
| # Makes -DMACRO equivalent to -DPNG_NO_NAME or -DPNG_NAME_SUPPORTED |
| # as appropriate. |
| # |
| # The definition is injected into the C compiler input when encountered |
| # in the second pass (so all these definitions appear *after* the @ |
| # lines!) |
| # |
| # 'NAME' is as above, but 'MACRO' is the full text of the equivalent |
| # old, deprecated, macro. |
| |
| $1 == "=" && NF == 3{ |
| print "#ifdef PNG_" $3 >out |
| if ($2 ~ /^NO_/) |
| print "# define PNG_" $2 >out |
| else |
| print "# define PNG_" $2 "_SUPPORTED" >out |
| print "#endif" >out |
| next |
| } |
| |
| # Lines may be injected into the C compiler input by preceding them |
| # with an "@" character. The line is copied with just the leading |
| # @ removed. |
| |
| $1 ~ /^@/{ |
| # sub(/^[ ]*@/, "") |
| $1 = substr($1, 2) |
| print >out |
| next |
| } |
| |
| # Check for unrecognized lines, because of the preprocessing chunk |
| # format errors will be detected on the first pass independent of |
| # any other format errors. |
| { |
| print "options.awk: bad line (" NR "):", $0 |
| err = 1 # prevent END{} running |
| exit 1 |
| } |
| |
| # For checking purposes names that start with "ok_" or "fail_" are |
| # not output to pnglibconf.h and must be either enabled or disabled |
| # respectively for the build to succeed. This allows interdependencies |
| # between options of the form "at least one of" or "at most one of" |
| # to be checked. For example: |
| # |
| # option FLOATING_POINT enables ok_math |
| # option FIXED_POINT enables ok_math |
| # This ensures that at least one of FLOATING_POINT and FIXED_POINT |
| # must be set for the build to succeed. |
| # |
| # option fail_math requires FLOATING_POINT FIXED_POINT |
| # This means the build will fail if *both* FLOATING_POINT and |
| # FIXED_POINT are set (this is an example; in fact both are allowed.) |
| # |
| # If all these options were given the build would require exactly one |
| # of the names to be enabled. |
| |
| END{ |
| # END{} gets run on an exit (a traditional awk feature) |
| if (err) exit 1 |
| |
| if (pre) { |
| # Record the final value of the variables |
| print "deb =", deb >out |
| if (everything != "") { |
| print "everything =", everything >out |
| } |
| print "logunsupported =", logunsupported >out |
| exit 0 |
| } |
| |
| # Do the options first (allowing options to set settings). The dependency |
| # tree is thus: |
| # |
| # name > name |
| # name requires name |
| # name if name |
| # name enabledby name |
| # |
| # First build a list 'tree' by option of all the things on which |
| # it depends. |
| print "" >out |
| print "/* OPTIONS */" >out |
| print comment, "options", cend >out |
| for (opt in enabledby) tree[opt] = 1 # may not be explicit options |
| for (opt in option) if (opt != "") { |
| o = option[opt] |
| # option should always be one of the following values |
| if (o != "on" && o != "off" && o != "disabled" && o != "enabled") { |
| print "internal option error (" o ")" |
| exit 1 |
| } |
| tree[opt] = "" # so unlisted options marked |
| } |
| for (opt in tree) if (opt != "") { |
| if (tree[opt] == 1) { |
| tree[opt] = "" |
| if (option[opt] != "") { |
| print "internal error (1)" |
| exit 1 |
| } |
| # Macros only listed in 'enables' remain off unless |
| # one of the enabling macros is on. |
| option[opt] = "disabled" |
| } |
| |
| split("", list) # clear 'list' |
| # Now add every requires, iffs or enabledby entry to 'list' |
| # so that we can add a unique list of requirements to tree[i] |
| split(requires[opt] iffs[opt] enabledby[opt], r) |
| for (i in r) list[r[i]] = 1 |
| for (i in list) tree[opt] = tree[opt] " " i |
| } |
| |
| # print the tree for extreme debugging |
| if (deb > 2) for (i in tree) if (i != "") print i, "depends-on" tree[i] |
| |
| # Ok, now check all options marked explicitly 'on' or 'off': |
| # |
| # If an option[opt] is 'on' then turn on all requires[opt] |
| # If an option[opt] is 'off' then turn off all enabledby[opt] |
| # |
| # Error out if we have to turn 'on' to an 'off' option or vice versa. |
| npending = 0 |
| for (opt in option) if (opt != "") { |
| if (option[opt] == "on" || option[opt] == "off") { |
| pending[++npending] = opt |
| } |
| } |
| |
| err = 0 # set on error |
| while (npending > 0) { |
| opt = pending[npending--] |
| if (option[opt] == "on") { |
| nreqs = split(requires[opt], r) |
| for (j=1; j<=nreqs; ++j) { |
| if (option[r[j]] == "off") { |
| print "option", opt, "turned on, but requirement", r[j], "is turned off" |
| err = 1 |
| } else if (option[r[j]] != "on") { |
| option[r[j]] = "on" |
| pending[++npending] = r[j] |
| } |
| } |
| } else { |
| if (option[opt] != "off") { |
| print "internal error (2)" |
| exit 1 |
| } |
| nreqs = split(enabledby[opt], r) |
| for (j=1; j<=nreqs; ++j) { |
| if (option[r[j]] == "on") { |
| print "option", opt, "turned off, but enabled by", r[j], "which is turned on" |
| err = 1 |
| } else if (option[r[j]] != "off") { |
| option[r[j]] = "off" |
| pending[++npending] = r[j] |
| } |
| } |
| } |
| } |
| if (err) exit 1 |
| |
| # Sort options: |
| print "PNG_DFN_START_SORT 2" >out |
| |
| # option[i] is now the complete list of all the tokens we may |
| # need to output, go through it as above, depth first. |
| finished = 0 |
| while (!finished) { |
| finished = 1 |
| movement = 0 # done nothing |
| for (i in option) if (!done[i]) { |
| nreqs = split(tree[i], r) |
| if (nreqs > 0) { |
| for (j=1; j<=nreqs; ++j) if (!done[r[j]]) { |
| break |
| } |
| if (j<=nreqs) { |
| finished = 0 |
| continue # next option |
| } |
| } |
| |
| # All the requirements have been processed, output |
| # this option. An option is _SUPPORTED if: |
| # |
| # all 'requires' are _SUPPORTED AND |
| # at least one of the 'if' options are _SUPPORTED AND |
| # EITHER: |
| # The name is _SUPPORTED (on the command line) |
| # OR: |
| # an 'enabledby' is _SUPPORTED |
| # OR: |
| # NO_name is not defined AND |
| # the option is not disabled; an option is disabled if: |
| # option == off |
| # option == disabled && everything != on |
| # option == "" && everything == off |
| if (deb) print "option", i |
| print "" >out |
| print "/* option:", i, option[i] >out |
| print " * requires: " requires[i] >out |
| print " * if: " iffs[i] >out |
| print " * enabled-by:" enabledby[i] >out |
| print " * sets: " sets[i], "*/" >out |
| print "#undef PNG_on" >out |
| print "#define PNG_on 1" >out |
| |
| # requires |
| nreqs = split(requires[i], r) |
| for (j=1; j<=nreqs; ++j) { |
| print "#ifndef PNG_" r[j] "_SUPPORTED" >out |
| print "# undef PNG_on /*!" r[j] "*/" >out |
| # This error appears in the final output if something |
| # was switched 'on' but the processing above to force |
| # the requires did not work |
| if (option[i] == "on") { |
| print error, i, "requires", r[j] end >out |
| } |
| print "#endif" >out |
| } |
| |
| # if |
| have_ifs = 0 |
| nreqs = split(iffs[i], r) |
| print "#undef PNG_no_if" >out |
| if (nreqs > 0) { |
| have_ifs = 1 |
| print "/* if" iffs[i], "*/" >out |
| print "#define PNG_no_if 1" >out |
| for (j=1; j<=nreqs; ++j) { |
| print "#ifdef PNG_" r[j] "_SUPPORTED" >out |
| print "# undef PNG_no_if /*" r[j] "*/" >out |
| print "#endif" >out |
| } |
| print "#ifdef PNG_no_if /*missing if*/" >out |
| print "# undef PNG_on" >out |
| # There is no checking above for this, because we |
| # don't know which 'if' to choose, so whine about |
| # it here: |
| if (option[i] == "on") { |
| print error, i, "needs one of:", iffs[i] end >out |
| } |
| print "#endif" >out |
| } |
| |
| print "#ifdef PNG_on /*requires, if*/" >out |
| # enables |
| print "# undef PNG_not_enabled" >out |
| print "# define PNG_not_enabled 1" >out |
| print " /* enabled by" enabledby[i], "*/" >out |
| nreqs = split(enabledby[i], r) |
| for (j=1; j<=nreqs; ++j) { |
| print "#ifdef PNG_" r[j] "_SUPPORTED" >out |
| print "# undef PNG_not_enabled /*" r[j] "*/" >out |
| # Oops, probably not intended (should be factored |
| # out by the checks above). |
| if (option[i] == "off") { |
| print error, i, "enabled by:", r[j] end >out |
| } |
| print "#endif" >out |
| } |
| |
| print "# ifndef PNG_" i "_SUPPORTED /*!command line*/" >out |
| print "# ifdef PNG_not_enabled /*!enabled*/" >out |
| # 'have_ifs' here means that everything = "off" still allows an 'if' on |
| # an otherwise enabled option to turn it on; otherwise the 'if' |
| # handling is effectively disabled by 'everything = off' |
| if (option[i] == "off" || option[i] == "disabled" && everything != "on" || option[i] == "enabled" && everything == "off" && !have_ifs) { |
| print "# undef PNG_on /*default off*/" >out |
| } else { |
| print "# ifdef PNG_NO_" i >out |
| print "# undef PNG_on /*turned off*/" >out |
| print "# endif" >out |
| print "# ifdef PNG_NO_" i "_SUPPORTED" >out |
| print "# undef PNG_on /*turned off*/" >out |
| print "# endif" >out |
| } |
| print "# endif /*!enabled*/" >out |
| print "# ifdef PNG_on" >out |
| # The _SUPPORTED macro must be defined so that dependent |
| # options output later work. |
| print "# define PNG_" i "_SUPPORTED" >out |
| print "# endif" >out |
| print "# endif /*!command line*/" >out |
| # If PNG_on is still set the option should be defined in |
| # pnglibconf.h |
| print "# ifdef PNG_on" >out |
| if (i ~ /^fail_/) { |
| print error, i, "is on: enabled by:" iffs[i] enabledby[i] ", requires" requires[i] end >out |
| } else if (i !~ /^ok_/) { |
| print def i sup >out |
| # Supported option, set required settings |
| nreqs = split(sets[i], r) |
| for (j=1; j<=nreqs; ++j) { |
| print "# ifdef PNG_set_" r[j] >out |
| # Some other option has already set a value: |
| print error, i, "sets", r[j] ": duplicate setting" end >out |
| print error, " previous value: " end "PNG_set_" r[j] >out |
| print "# else" >out |
| # Else set the default: note that this won't accept arbitrary |
| # values, the setval string must be acceptable to all the C |
| # compilers we use. That means it must be VERY simple; a number, |
| # a name or a string. |
| print "# define PNG_set_" r[j], setval[i " " r[j]] >out |
| print "# endif" >out |
| } |
| } |
| print "# endif /* definition */" >out |
| print "#endif /*requires, if*/" >out |
| if (logunsupported || i ~ /^ok_/) { |
| print "#ifndef PNG_on" >out |
| if (logunsupported) { |
| print und i une >out |
| } |
| if (i ~ /^ok_/) { |
| print error, i, "not enabled: requires:" requires[i] ", enabled by:" iffs[i] enabledby[i] end >out |
| } |
| print "#endif" >out |
| } |
| |
| done[i] = 1 |
| ++movement |
| } |
| |
| if (!finished && !movement) { |
| print "option: loop or missing option in dependency tree, cannot process:" |
| for (i in option) if (!done[i]) { |
| print " option", i, "depends on" tree[i], "needs:" |
| nreqs = split(tree[i], r) |
| if (nreqs > 0) for (j=1; j<=nreqs; ++j) if (!done[r[j]]) { |
| print " " r[j] |
| } |
| } |
| exit 1 |
| } |
| } |
| print "PNG_DFN_END_SORT" >out |
| print comment, "end of options", cend >out |
| |
| # Do the 'setting' values second, the algorithm the standard |
| # tree walk (O(1)) done in an O(2) while/for loop; iterations |
| # settings x depth, outputting the deepest required macros |
| # first. |
| print "" >out |
| print "/* SETTINGS */" >out |
| print comment, "settings", cend >out |
| # Sort (in dfn.awk) on field 2, the setting name |
| print "PNG_DFN_START_SORT 2" >out |
| finished = 0 |
| while (!finished) { |
| finished = 1 |
| movement = 0 # done nothing |
| for (i in setting) if (!doneset[i]) { |
| nreqs = split(setting[i], r) |
| if (nreqs > 0) { |
| # By default assume the requires values are options, but if there |
| # is no option with that name check for a setting |
| for (j=1; j<=nreqs; ++j) if (option[r[j]] == "" && !doneset[r[j]]) { |
| break |
| } |
| if (j<=nreqs) { |
| finished = 0 |
| continue # try a different setting |
| } |
| } |
| |
| # All the requirements have been processed, output |
| # this setting. |
| if (deb) print "setting", i |
| deflt = defaults[i] |
| # Remove any spurious trailing spaces |
| sub(/ *$/,"",deflt) |
| # A leading @ means leave it unquoted so the preprocessor |
| # can substitute the build time value |
| if (deflt ~ /^ @/) |
| deflt = " " subs substr(deflt, 3) sube |
| print "" >out |
| print "/* setting: ", i >out |
| print " * requires:" setting[i] >out |
| print " * default: ", defaults[i] deflt, "*/" >out |
| for (j=1; j<=nreqs; ++j) { |
| if (option[r[j]] != "") |
| print "#ifndef PNG_" r[j] "_SUPPORTED" >out |
| else |
| print "#ifndef PNG_" r[j] >out |
| print error, i, "requires", r[j] end >out |
| print "# endif" >out |
| } |
| # The precedence is: |
| # |
| # 1) External definition; trumps: |
| # 2) Option 'sets' value; trumps: |
| # 3) Setting 'default' |
| # |
| print "#ifdef PNG_" i >out |
| # PNG_<i> is defined, so substitute the value: |
| print def i, subs "PNG_" i sube end >out |
| print "#else /* use default */" >out |
| print "# ifdef PNG_set_" i >out |
| # Value from an option 'sets' argument |
| print def i, subs "PNG_set_" i sube end >out |
| # This is so that subsequent tests on the setting work: |
| print "# define PNG_" i, "1" >out |
| if (defaults[i] != "") { |
| print "# else /*default*/" >out |
| print def i deflt end >out |
| print "# define PNG_" i, "1" >out |
| } |
| print "# endif /* defaults */" >out |
| print "#endif /* setting", i, "*/" >out |
| |
| doneset[i] = 1 |
| ++movement |
| } |
| |
| if (!finished && !movement) { |
| print "setting: loop or missing setting in 'requires', cannot process:" |
| for (i in setting) if (!doneset[i]) { |
| print " setting", i, "requires" setting[i] |
| } |
| exit 1 |
| } |
| } |
| print "PNG_DFN_END_SORT" >out |
| print comment, "end of settings", cend >out |
| |
| # Regular end - everything looks ok |
| if (protect != "") { |
| print start "#endif", "/*", protect, "*/" end >out |
| } |
| } |
