| 1 | #!/bin/awk -f
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| 2 | # scripts/options.awk - library build configuration control
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| 3 | #
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| 4 | # last changed in libpng version 1.6.11 - June 5, 2014
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| 5 | #
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| 6 | # Copyright (c) 1998-2014 Glenn Randers-Pehrson
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| 7 | #
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| 8 | # This code is released under the libpng license.
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| 9 | # For conditions of distribution and use, see the disclaimer
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| 10 | # and license in png.h
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| 11 |
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| 12 | # The output of this script is written to the file given by
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| 13 | # the variable 'out'. The script is run twice, once with
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| 14 | # an intermediate output file, 'options.tmp' then again on
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| 15 | # that file to produce the final output:
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| 16 | #
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| 17 | # awk -f scripts/options.awk out=options.tmp scripts/options.dfa 1>&2
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| 18 | # awk -f scripts/options.awk out=options.dfn options.tmp 1>&2
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| 19 | #
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| 20 | # Some options may be specified on the command line:
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| 21 | #
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| 22 | # deb=1 Causes debugging to be output
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| 23 | # logunsupported=1 Causes all options to be recorded in the output
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| 24 | # everything=off Causes all options to be disabled by default
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| 25 | # everything=on Causes all options to be enabled by default
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| 26 | #
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| 27 | # If awk fails on your platform, try nawk instead.
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| 28 | #
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| 29 | # These options may also be specified in the original input file (and
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| 30 | # are copied to the preprocessed file).
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| 31 |
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| 32 | BEGIN{
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| 33 | out="" # intermediate, preprocessed, file
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| 34 | pre=-1 # preprocess (first line)
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| 35 | version="libpng version unknown" # version information
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| 36 | version_file="" # where to find the version
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| 37 | err=0 # in-line exit sets this
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| 38 | # The following definitions prevent the C preprocessor noticing the lines
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| 39 | # that will be in the final output file. Some C preprocessors tokenise
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| 40 | # the lines, for example by inserting spaces around operators, and all
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| 41 | # C preprocessors notice lines that start with '#', most remove comments.
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| 42 | # The technique adopted here is to make the final output lines into
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| 43 | # C strings (enclosed in double quotes), preceded by PNG_DFN. As a
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| 44 | # consequence the output cannot contain a 'raw' double quote - instead put
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| 45 | # @' in, this will be replaced by a single " afterward. See the parser
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| 46 | # script dfn.awk for more capabilities (not required here). Note that if
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| 47 | # you need a " in a 'setting' in pnglibconf.dfa it must also be @'!
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| 48 | dq="@'" # For a single double quote
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| 49 | start=" PNG_DFN \"" # Start stuff to output (can't contain a "!)
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| 50 | end="\" " # End stuff to output
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| 51 | subs="@\" " # Substitute start (substitute a C macro)
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| 52 | sube=" \"@" # Substitute end
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| 53 | comment=start "/*" # Comment start
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| 54 | cend="*/" end # Comment end
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| 55 | def=start "#define PNG_" # Arbitrary define
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| 56 | sup="_SUPPORTED" end # end supported option
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| 57 | und=comment "#undef PNG_" # Unsupported option
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| 58 | une="_SUPPORTED" cend # end unsupported option
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| 59 | error=start "ERROR:" # error message, terminate with 'end'
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| 60 |
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| 61 | # Variables
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| 62 | deb=0 # debug - set on command line
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| 63 | everything="" # do not override defaults
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| 64 | logunsupported=0 # write unsupported options too
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| 65 |
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| 66 | # Precreate arrays
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| 67 | # for each option:
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| 68 | option[""] = "" # list of all options: default enabled/disabled
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| 69 | done[""] = 1 # marks option as having been output
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| 70 | requires[""] = "" # requires by option
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| 71 | iffs[""] = "" # if by option
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| 72 | enabledby[""] = "" # options that enable it by option
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| 73 | sets[""] = "" # settings set by each option
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| 74 | setval[""] = "" # value to set (indexed: 'option sets[option]')
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| 75 | # for each setting:
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| 76 | setting[""] = "" # requires by setting
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| 77 | defaults[""] = "" # used for a defaulted value
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| 78 | doneset[""] = 1 # marks setting as having been output
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| 79 | r[""] = "" # Temporary array
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| 80 |
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| 81 | # For decorating the output file
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| 82 | protect = ""
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| 83 | }
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| 84 |
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| 85 | # The output file must be specified before any input:
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| 86 | out == "" {
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| 87 | print "out=output.file must be given on the command line"
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| 88 | err = 1
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| 89 | exit 1
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| 90 | }
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| 91 |
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| 92 | # The very first line indicates whether we are reading pre-processed
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| 93 | # input or not, this must come *first* because 'PREPROCESSED' needs
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| 94 | # to be the very first line in the temporary file.
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| 95 | pre == -1{
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| 96 | if ($0 == "PREPROCESSED") {
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| 97 | pre = 0
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| 98 | next
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| 99 | } else {
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| 100 | pre = 1
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| 101 | print "PREPROCESSED" >out
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| 102 | # And fall through to continue processing
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| 103 | }
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| 104 | }
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| 105 |
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| 106 | # While pre-processing if version is set to "search" look for a version string
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| 107 | # in the following file.
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| 108 | pre && version == "search" && version_file == ""{
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| 109 | version_file = FILENAME
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| 110 | }
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| 111 |
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| 112 | pre && version == "search" && version_file != FILENAME{
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| 113 | print "version string not found in", version_file
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| 114 | err = 1
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| 115 | exit 1
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| 116 | }
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| 117 |
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| 118 | pre && version == "search" && $0 ~ /^ \* libpng version/{
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| 119 | version = substr($0, 4)
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| 120 | print "version =", version >out
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| 121 | next
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| 122 | }
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| 123 |
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| 124 | pre && FILENAME == version_file{
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| 125 | next
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| 126 | }
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| 127 |
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| 128 | # variable=value
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| 129 | # Sets the given variable to the given value (the syntax is fairly
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| 130 | # free form, except for deb (you are expected to understand how to
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| 131 | # set the debug variable...)
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| 132 | #
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| 133 | # This happens before the check on 'pre' below skips most of the
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| 134 | # rest of the actions, so the variable settings happen during
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| 135 | # preprocessing but are recorded in the END action too. This
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| 136 | # allows them to be set on the command line too.
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| 137 | $0 ~ /^[ ]*version[ ]*=/{
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| 138 | sub(/^[ ]*version[ ]*=[ ]*/, "")
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| 139 | version = $0
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| 140 | next
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| 141 | }
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| 142 | $0 ~ /^[ ]*everything[ =]*off[ ]*$/{
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| 143 | everything = "off"
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| 144 | next
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| 145 | }
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| 146 | $0 ~ /^[ ]*everything[ =]*on[ ]*$/{
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| 147 | everything = "on"
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| 148 | next
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| 149 | }
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| 150 | $0 ~ /^[ ]*logunsupported[ =]*0[ ]*$/{
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| 151 | logunsupported = 0
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| 152 | next
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| 153 | }
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| 154 | $0 ~ /^[ ]*logunsupported[ =]*1[ ]*$/{
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| 155 | logunsupported = 1
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| 156 | next
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| 157 | }
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| 158 | $1 == "deb" && $2 == "=" && NF == 3{
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| 159 | deb = $3
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| 160 | next
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| 161 | }
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| 162 |
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| 163 | # Preprocessing - this just copies the input file with lines
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| 164 | # that need preprocessing (just chunk at present) expanded
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| 165 | # The bare "pre" instead of "pre != 0" crashes under Sunos awk
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| 166 | pre && $1 != "chunk"{
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| 167 | print >out
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| 168 | next
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| 169 | }
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| 170 |
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| 171 | # The first characters of the line determine how it is processed,
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| 172 | # leading spaces are ignored. In general tokens that are not
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| 173 | # keywords are the names of options. An option 'name' is
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| 174 | # controlled by the definition of the corresponding macros:
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| 175 | #
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| 176 | # PNG_name_SUPPORTED The option is turned on
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| 177 | # PNG_NO_name
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| 178 | # PNG_NO_name_SUPPORTED If the first macro is not defined
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| 179 | # either of these will turn the option off
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| 180 | #
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| 181 | # If none of these macros are defined the option is turned on, unless
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| 182 | # the keyword 'off' is given in a line relating to the option. The
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| 183 | # keyword 'on' can also be given, but it will be ignored (since it is
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| 184 | # the default.)
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| 185 | #
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| 186 | # In the syntax below a 'name' is indicated by "NAME", other macro
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| 187 | # values are indicated by "MACRO", as with "NAME" the leading "PNG_"
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| 188 | # is omitted, but in this case the "NO_" prefix and the "_SUPPORTED"
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| 189 | # suffix are never used.
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| 190 | #
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| 191 | # Each line is introduced by a keyword - the first non-space characters
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| 192 | # on the line. A line starting with a '#' is a comment - it is totally
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| 193 | # ignored. Keywords are as follows, a NAME, is simply a macro name
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| 194 | # without the leading PNG_, PNG_NO_ or the trailing _SUPPORTED.
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| 195 |
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| 196 | $1 ~ /^#/ || $0 ~ /^[ ]*$/{
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| 197 | next
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| 198 | }
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| 199 |
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| 200 | # com <comment>
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| 201 | # The whole line is placed in the output file as a comment with
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| 202 | # the preceding 'com' removed
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| 203 | $1 == "com"{
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| 204 | if (NF > 1) {
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| 205 | # sub(/^[ ]*com[ ]*/, "")
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| 206 | $1 = ""
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| 207 | print comment $0, cend >out
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| 208 | } else
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| 209 | print start end >out
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| 210 | next
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| 211 | }
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| 212 |
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| 213 | # version
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| 214 | # Inserts a version comment
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| 215 | $1 == "version" && NF == 1{
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| 216 | if (version == "") {
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| 217 | print "ERROR: no version string set"
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| 218 | err = 1 # prevent END{} running
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| 219 | exit 1
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| 220 | }
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| 221 |
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| 222 | print comment, version, cend >out
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| 223 | next
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| 224 | }
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| 225 |
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| 226 | # file output input protect
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| 227 | # Informational: the official name of the input file (without
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| 228 | # make generated local directories), the official name of the
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| 229 | # output file and, if required, a name to use in a protection
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| 230 | # macro for the contents.
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| 231 | $1 == "file" && NF >= 2{
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| 232 | print comment, $2, cend >out
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| 233 | print comment, "Machine generated file: DO NOT EDIT", cend >out
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| 234 | if (NF >= 3)
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| 235 | print comment, "Derived from:", $3, cend >out
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| 236 | protect = $4
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| 237 | if (protect != "") {
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| 238 | print start "#ifndef", protect end >out
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| 239 | print start "#define", protect end >out
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| 240 | }
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| 241 | next
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| 242 | }
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| 243 |
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| 244 | # option NAME ( (requires|enables|if) NAME* | on | off | disabled |
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| 245 | # sets SETTING VALUE+ )*
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| 246 | #
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| 247 | # Declares an option 'NAME' and describes its default setting (disabled)
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| 248 | # and its relationship to other options. The option is disabled
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| 249 | # unless *all* the options listed after 'requires' are set and at
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| 250 | # least one of the options listed after 'if' is set. If the
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| 251 | # option is set then it turns on all the options listed after 'enables'.
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| 252 | #
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| 253 | # Note that "enables" takes priority over the required/if/disabled/off
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| 254 | # setting of the target option.
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| 255 | #
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| 256 | # The definition file may list an option as 'disabled': off by default,
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| 257 | # otherwise the option is enabled: on by default. A later (and it must
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| 258 | # be later) entry may turn an option on or off explicitly.
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| 259 |
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| 260 | $1 == "option" && NF >= 2{
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| 261 | opt = $2
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| 262 | sub(/,$/,"",opt)
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| 263 | onoff = option[opt] # records current (and the default is "", enabled)
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| 264 | key = ""
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| 265 | istart = 3
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| 266 | do {
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| 267 | if (istart == 1) { # continuation line
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| 268 | val = getline
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| 269 |
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| 270 | if (val != 1) { # error reading it
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| 271 | if (val == 0)
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| 272 | print "option", opt ": ERROR: missing continuation line"
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| 273 | else
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| 274 | print "option", opt ": ERROR: error reading continuation line"
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| 275 |
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| 276 | # This is a hard error
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| 277 | err = 1 # prevent END{} running
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| 278 | exit 1
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| 279 | }
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| 280 | }
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| 281 |
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| 282 | for (i=istart; i<=NF; ++i) {
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| 283 | val=$(i)
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| 284 | sub(/,$/,"",val)
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| 285 | if (val == "on" || val == "off" || val == "disabled" || val =="enabled") {
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| 286 | key = ""
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| 287 | if (onoff != val) {
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| 288 | # on or off can zap disabled or enabled:
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| 289 | if (onoff == "" || (onoff == "disabled" || onoff == "enabled") &&
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| 290 | (val == "on" || val == "off")) {
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| 291 | # It's easy to mis-spell the option when turning it
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| 292 | # on or off, so warn about it here:
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| 293 | if (onoff == "" && (val == "on" || val == "off")) {
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| 294 | print "option", opt ": ERROR: turning unrecognized option", val
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| 295 | # For the moment error out - it is safer
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| 296 | err = 1 # prevent END{} running
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| 297 | exit 1
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| 298 | }
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| 299 | onoff = val
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| 300 | } else {
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| 301 | # Print a message, otherwise the error
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| 302 | # below is incomprehensible
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| 303 | print "option", opt ": currently", onoff ": attempt to turn", val
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| 304 | break
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| 305 | }
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| 306 | }
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| 307 | } else if (val == "requires" || val == "if" || val == "enables" || val =="sets") {
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| 308 | key = val
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| 309 | } else if (key == "requires") {
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| 310 | requires[opt] = requires[opt] " " val
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| 311 | } else if (key == "if") {
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| 312 | iffs[opt] = iffs[opt] " " val
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| 313 | } else if (key == "enables") {
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| 314 | enabledby[val] = enabledby[val] " " opt
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| 315 | } else if (key == "sets") {
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| 316 | sets[opt] = sets[opt] " " val
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| 317 | key = "setval"
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| 318 | set = val
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| 319 | } else if (key == "setval") {
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| 320 | setval[opt " " set] = setval[opt " " set] " " val
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| 321 | } else
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| 322 | break # bad line format
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| 323 | }
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| 324 |
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| 325 | istart = 1
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| 326 | } while (i > NF && $0 ~ /,$/)
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| 327 |
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| 328 | if (i > NF) {
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| 329 | # Set the option, defaulting to 'enabled'
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| 330 | if (onoff == "") onoff = "enabled"
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| 331 | option[opt] = onoff
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| 332 | next
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| 333 | }
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| 334 | # Else fall through to the error handler
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| 335 | }
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| 336 |
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| 337 | # chunk NAME [requires OPT] [enables LIST] [on|off|disabled]
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| 338 | # Expands to the 'option' settings appropriate to the reading and
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| 339 | # writing of an ancillary PNG chunk 'NAME':
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| 340 | #
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| 341 | # option READ_NAME requires READ_ANCILLARY_CHUNKS [READ_OPT]
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| 342 | # option READ_NAME enables NAME LIST
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| 343 | # [option READ_NAME off]
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| 344 | # option WRITE_NAME requires WRITE_ANCILLARY_CHUNKS [WRITE_OPT]
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| 345 | # option WRITE_NAME enables NAME LIST
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| 346 | # [option WRITE_NAME off]
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| 347 |
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| 348 | pre != 0 && $1 == "chunk" && NF >= 2{
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| 349 | # 'chunk' is handled on the first pass by writing appropriate
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| 350 | # 'option' lines into the intermediate file.
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| 351 | opt = $2
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| 352 | sub(/,$/,"",opt)
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| 353 | onoff = ""
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| 354 | reqread = ""
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| 355 | reqwrite = ""
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| 356 | enables = ""
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| 357 | req = 0
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| 358 | istart = 3
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| 359 | do {
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| 360 | if (istart == 1) { # continuation line
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| 361 | val = getline
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| 362 |
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| 363 | if (val != 1) { # error reading it
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| 364 | if (val == 0)
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| 365 | print "chunk", opt ": ERROR: missing continuation line"
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| 366 | else
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| 367 | print "chunk", opt ": ERROR: error reading continuation line"
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| 368 |
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| 369 | # This is a hard error
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| 370 | err = 1 # prevent END{} running
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| 371 | exit 1
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| 372 | }
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| 373 | }
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| 374 |
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| 375 | # read the keywords/additional OPTS
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| 376 | for (i=istart; i<=NF; ++i) {
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| 377 | val = $(i)
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| 378 | sub(/,$/,"",val)
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| 379 | if (val == "on" || val == "off" || val == "disabled") {
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| 380 | if (onoff != val) {
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| 381 | if (onoff == "")
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| 382 | onoff = val
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| 383 | else
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| 384 | break # on/off conflict
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| 385 | }
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| 386 | req = 0
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| 387 | } else if (val == "requires")
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| 388 | req = 1
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| 389 | else if (val == "enables")
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| 390 | req = 2
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| 391 | else if (req == 1){
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| 392 | reqread = reqread " READ_" val
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| 393 | reqwrite = reqwrite " WRITE_" val
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| 394 | } else if (req == 2)
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| 395 | enables = enables " " val
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| 396 | else
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| 397 | break # bad line: handled below
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| 398 | }
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| 399 |
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| 400 | istart = 1
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| 401 | } while (i > NF && $0 ~ /,$/)
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| 402 |
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| 403 | if (i > NF) {
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| 404 | # Output new 'option' lines to the intermediate file (out)
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| 405 | print "option READ_" opt, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", opt enables , onoff >out
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| 406 | print "option WRITE_" opt, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", opt enables, onoff >out
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| 407 | next
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| 408 | }
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| 409 | # Else hit the error handler below - bad line format!
|
|---|
| 410 | }
|
|---|
| 411 |
|
|---|
| 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
|
|---|
| 422 |
|
|---|
| 423 | $1 == "setting" && (NF == 2 || NF >= 3 && ($3 == "requires" || $3 == "default")){
|
|---|
| 424 | reqs = ""
|
|---|
| 425 | deflt = ""
|
|---|
| 426 | isdef = 0
|
|---|
| 427 | key = ""
|
|---|
| 428 | for (i=3; i<=NF; ++i)
|
|---|
| 429 | if ($(i) == "requires" || $(i) == "default") {
|
|---|
| 430 | key = $(i)
|
|---|
| 431 | if (key == "default") isdef = 1
|
|---|
| 432 | } else if (key == "requires")
|
|---|
| 433 | reqs = reqs " " $(i)
|
|---|
| 434 | else if (key == "default")
|
|---|
| 435 | deflt = deflt " " $(i)
|
|---|
| 436 | else
|
|---|
| 437 | break # Format error, handled below
|
|---|
| 438 |
|
|---|
| 439 | setting[$2] = reqs
|
|---|
| 440 | # NOTE: this overwrites a previous value silently
|
|---|
| 441 | if (isdef && deflt == "")
|
|---|
| 442 | deflt = " " # as a flag to force output
|
|---|
| 443 | defaults[$2] = deflt
|
|---|
| 444 | next
|
|---|
| 445 | }
|
|---|
| 446 |
|
|---|
| 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.
|
|---|
| 454 | #
|
|---|
| 455 | # Similarly 'enables' trumps a NO_ definition in CFLAGS or pngusr.h
|
|---|
| 456 | #
|
|---|
| 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.
|
|---|
| 461 |
|
|---|
| 462 | # For backwards compatibility equivalent macros may be listed thus:
|
|---|
| 463 | #
|
|---|
| 464 | # = [NO_]NAME MACRO
|
|---|
| 465 | # Makes -DMACRO equivalent to -DPNG_NO_NAME or -DPNG_NAME_SUPPORTED
|
|---|
| 466 | # as appropriate.
|
|---|
| 467 | #
|
|---|
| 468 | # The definition is injected into the C compiler input when encountered
|
|---|
| 469 | # in the second pass (so all these definitions appear *after* the @
|
|---|
| 470 | # lines!)
|
|---|
| 471 | #
|
|---|
| 472 | # 'NAME' is as above, but 'MACRO' is the full text of the equivalent
|
|---|
| 473 | # old, deprecated, macro.
|
|---|
| 474 |
|
|---|
| 475 | $1 == "=" && NF == 3{
|
|---|
| 476 | print "#ifdef PNG_" $3 >out
|
|---|
| 477 | if ($2 ~ /^NO_/)
|
|---|
| 478 | print "# define PNG_" $2 >out
|
|---|
| 479 | else
|
|---|
| 480 | print "# define PNG_" $2 "_SUPPORTED" >out
|
|---|
| 481 | print "#endif" >out
|
|---|
| 482 | next
|
|---|
| 483 | }
|
|---|
| 484 |
|
|---|
| 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
|
|---|
| 487 | # @ removed.
|
|---|
| 488 |
|
|---|
| 489 | $1 ~ /^@/{
|
|---|
| 490 | # sub(/^[ ]*@/, "")
|
|---|
| 491 | $1 = substr($1, 2)
|
|---|
| 492 | print >out
|
|---|
| 493 | next
|
|---|
| 494 | }
|
|---|
| 495 |
|
|---|
| 496 | # Check for unrecognized lines, because of the preprocessing chunk
|
|---|
| 497 | # format errors will be detected on the first pass independent of
|
|---|
| 498 | # any other format errors.
|
|---|
| 499 | {
|
|---|
| 500 | print "options.awk: bad line (" NR "):", $0
|
|---|
| 501 | err = 1 # prevent END{} running
|
|---|
| 502 | exit 1
|
|---|
| 503 | }
|
|---|
| 504 |
|
|---|
| 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:
|
|---|
| 510 | #
|
|---|
| 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.
|
|---|
| 515 | #
|
|---|
| 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.)
|
|---|
| 519 | #
|
|---|
| 520 | # If all these options were given the build would require exactly one
|
|---|
| 521 | # of the names to be enabled.
|
|---|
| 522 |
|
|---|
| 523 | END{
|
|---|
| 524 | # END{} gets run on an exit (a traditional awk feature)
|
|---|
| 525 | if (err) exit 1
|
|---|
| 526 |
|
|---|
| 527 | if (pre) {
|
|---|
| 528 | # Record the final value of the variables
|
|---|
| 529 | print "deb =", deb >out
|
|---|
| 530 | if (everything != "") {
|
|---|
| 531 | print "everything =", everything >out
|
|---|
| 532 | }
|
|---|
| 533 | print "logunsupported =", logunsupported >out
|
|---|
| 534 | exit 0
|
|---|
| 535 | }
|
|---|
| 536 |
|
|---|
| 537 | # Do the options first (allowing options to set settings). The dependency
|
|---|
| 538 | # tree is thus:
|
|---|
| 539 | #
|
|---|
| 540 | # name > name
|
|---|
| 541 | # name requires name
|
|---|
| 542 | # name if name
|
|---|
| 543 | # name enabledby name
|
|---|
| 544 | #
|
|---|
| 545 | # First build a list 'tree' by option of all the things on which
|
|---|
| 546 | # it depends.
|
|---|
| 547 | print "" >out
|
|---|
| 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 != "") {
|
|---|
| 552 | o = option[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 ")"
|
|---|
| 556 | exit 1
|
|---|
| 557 | }
|
|---|
| 558 | tree[opt] = "" # so unlisted options marked
|
|---|
| 559 | }
|
|---|
| 560 | for (opt in tree) if (opt != "") {
|
|---|
| 561 | if (tree[opt] == 1) {
|
|---|
| 562 | tree[opt] = ""
|
|---|
| 563 | if (option[opt] != "") {
|
|---|
| 564 | print "internal error (1)"
|
|---|
| 565 | exit 1
|
|---|
| 566 | }
|
|---|
| 567 | # Macros only listed in 'enables' remain off unless
|
|---|
| 568 | # one of the enabling macros is on.
|
|---|
| 569 | option[opt] = "disabled"
|
|---|
| 570 | }
|
|---|
| 571 |
|
|---|
| 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
|
|---|
| 578 | }
|
|---|
| 579 |
|
|---|
| 580 | # print the tree for extreme debugging
|
|---|
| 581 | if (deb > 2) for (i in tree) if (i != "") print i, "depends-on" tree[i]
|
|---|
| 582 |
|
|---|
| 583 | # Ok, now check all options marked explicitly 'on' or 'off':
|
|---|
| 584 | #
|
|---|
| 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]
|
|---|
| 587 | #
|
|---|
| 588 | # Error out if we have to turn 'on' to an 'off' option or vice versa.
|
|---|
| 589 | npending = 0
|
|---|
| 590 | for (opt in option) if (opt != "") {
|
|---|
| 591 | if (option[opt] == "on" || option[opt] == "off") {
|
|---|
| 592 | pending[++npending] = opt
|
|---|
| 593 | }
|
|---|
| 594 | }
|
|---|
| 595 |
|
|---|
| 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"
|
|---|
| 604 | err = 1
|
|---|
| 605 | } else if (option[r[j]] != "on") {
|
|---|
| 606 | option[r[j]] = "on"
|
|---|
| 607 | pending[++npending] = r[j]
|
|---|
| 608 | }
|
|---|
| 609 | }
|
|---|
| 610 | } else {
|
|---|
| 611 | if (option[opt] != "off") {
|
|---|
| 612 | print "internal error (2)"
|
|---|
| 613 | exit 1
|
|---|
| 614 | }
|
|---|
| 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"
|
|---|
| 619 | err = 1
|
|---|
| 620 | } else if (option[r[j]] != "off") {
|
|---|
| 621 | option[r[j]] = "off"
|
|---|
| 622 | pending[++npending] = r[j]
|
|---|
| 623 | }
|
|---|
| 624 | }
|
|---|
| 625 | }
|
|---|
| 626 | }
|
|---|
| 627 | if (err) exit 1
|
|---|
| 628 |
|
|---|
| 629 | # Sort options:
|
|---|
| 630 | print "PNG_DFN_START_SORT 2" >out
|
|---|
| 631 |
|
|---|
| 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.
|
|---|
| 634 | finished = 0
|
|---|
| 635 | while (!finished) {
|
|---|
| 636 | finished = 1
|
|---|
| 637 | movement = 0 # done nothing
|
|---|
| 638 | for (i in option) if (!done[i]) {
|
|---|
| 639 | nreqs = split(tree[i], r)
|
|---|
| 640 | if (nreqs > 0) {
|
|---|
| 641 | for (j=1; j<=nreqs; ++j) if (!done[r[j]]) {
|
|---|
| 642 | break
|
|---|
| 643 | }
|
|---|
| 644 | if (j<=nreqs) {
|
|---|
| 645 | finished = 0
|
|---|
| 646 | continue # next option
|
|---|
| 647 | }
|
|---|
| 648 | }
|
|---|
| 649 |
|
|---|
| 650 | # All the requirements have been processed, output
|
|---|
| 651 | # this option. An option is _SUPPORTED if:
|
|---|
| 652 | #
|
|---|
| 653 | # all 'requires' are _SUPPORTED AND
|
|---|
| 654 | # at least one of the 'if' options are _SUPPORTED AND
|
|---|
| 655 | # EITHER:
|
|---|
| 656 | # The name is _SUPPORTED (on the command line)
|
|---|
| 657 | # OR:
|
|---|
| 658 | # an 'enabledby' is _SUPPORTED
|
|---|
| 659 | # OR:
|
|---|
| 660 | # NO_name is not defined AND
|
|---|
| 661 | # the option is not disabled; an option is disabled if:
|
|---|
| 662 | # option == off
|
|---|
| 663 | # option == disabled && everything != on
|
|---|
| 664 | # option == "" && everything == off
|
|---|
| 665 | if (deb) print "option", i
|
|---|
| 666 | print "" >out
|
|---|
| 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
|
|---|
| 674 |
|
|---|
| 675 | # requires
|
|---|
| 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
|
|---|
| 685 | }
|
|---|
| 686 | print "#endif" >out
|
|---|
| 687 | }
|
|---|
| 688 |
|
|---|
| 689 | # if
|
|---|
| 690 | have_ifs = 0
|
|---|
| 691 | nreqs = split(iffs[i], r)
|
|---|
| 692 | print "#undef PNG_no_if" >out
|
|---|
| 693 | if (nreqs > 0) {
|
|---|
| 694 | have_ifs = 1
|
|---|
| 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
|
|---|
| 700 | print "#endif" >out
|
|---|
| 701 | }
|
|---|
| 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
|
|---|
| 706 | # it here:
|
|---|
| 707 | if (option[i] == "on") {
|
|---|
| 708 | print error, i, "needs one of:", iffs[i] end >out
|
|---|
| 709 | }
|
|---|
| 710 | print "#endif" >out
|
|---|
| 711 | }
|
|---|
| 712 |
|
|---|
| 713 | print "#ifdef PNG_on /*requires, if*/" >out
|
|---|
| 714 | # enables
|
|---|
| 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
|
|---|
| 726 | }
|
|---|
| 727 | print "#endif" >out
|
|---|
| 728 | }
|
|---|
| 729 |
|
|---|
| 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
|
|---|
| 737 | } else {
|
|---|
| 738 | print "# ifdef PNG_NO_" i >out
|
|---|
| 739 | print "# undef PNG_on /*turned off*/" >out
|
|---|
| 740 | print "# endif" >out
|
|---|
| 741 | print "# ifdef PNG_NO_" i "_SUPPORTED" >out
|
|---|
| 742 | print "# undef PNG_on /*turned off*/" >out
|
|---|
| 743 | print "# endif" >out
|
|---|
| 744 | }
|
|---|
| 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
|
|---|
| 750 | print "# endif" >out
|
|---|
| 751 | print "# endif /*!command line*/" >out
|
|---|
| 752 | # If PNG_on is still set the option should be defined in
|
|---|
| 753 | # pnglibconf.h
|
|---|
| 754 | print "# ifdef PNG_on" >out
|
|---|
| 755 | if (i ~ /^fail_/) {
|
|---|
| 756 | print error, i, "is on: enabled by:" iffs[i] enabledby[i] ", requires" requires[i] end >out
|
|---|
| 757 | } else if (i !~ /^ok_/) {
|
|---|
| 758 | print def i sup >out
|
|---|
| 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
|
|---|
| 766 | print "# else" >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
|
|---|
| 772 | print "# endif" >out
|
|---|
| 773 | }
|
|---|
| 774 | }
|
|---|
| 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) {
|
|---|
| 780 | print und i une >out
|
|---|
| 781 | }
|
|---|
| 782 | if (i ~ /^ok_/) {
|
|---|
| 783 | print error, i, "not enabled: requires:" requires[i] ", enabled by:" iffs[i] enabledby[i] end >out
|
|---|
| 784 | }
|
|---|
| 785 | print "#endif" >out
|
|---|
| 786 | }
|
|---|
| 787 |
|
|---|
| 788 | done[i] = 1
|
|---|
| 789 | ++movement
|
|---|
| 790 | }
|
|---|
| 791 |
|
|---|
| 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]]) {
|
|---|
| 798 | print " " r[j]
|
|---|
| 799 | }
|
|---|
| 800 | }
|
|---|
| 801 | exit 1
|
|---|
| 802 | }
|
|---|
| 803 | }
|
|---|
| 804 | print "PNG_DFN_END_SORT" >out
|
|---|
| 805 | print comment, "end of options", cend >out
|
|---|
| 806 |
|
|---|
| 807 | # Do the 'setting' values second, the algorithm the standard
|
|---|
| 808 | # tree walk (O(1)) done in an O(2) while/for loop; iterations
|
|---|
| 809 | # settings x depth, outputting the deepest required macros
|
|---|
| 810 | # first.
|
|---|
| 811 | print "" >out
|
|---|
| 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
|
|---|
| 816 | finished = 0
|
|---|
| 817 | while (!finished) {
|
|---|
| 818 | finished = 1
|
|---|
| 819 | movement = 0 # done nothing
|
|---|
| 820 | for (i in setting) if (!doneset[i]) {
|
|---|
| 821 | nreqs = split(setting[i], r)
|
|---|
| 822 | if (nreqs > 0) {
|
|---|
| 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]]) {
|
|---|
| 826 | break
|
|---|
| 827 | }
|
|---|
| 828 | if (j<=nreqs) {
|
|---|
| 829 | finished = 0
|
|---|
| 830 | continue # try a different setting
|
|---|
| 831 | }
|
|---|
| 832 | }
|
|---|
| 833 |
|
|---|
| 834 | # All the requirements have been processed, output
|
|---|
| 835 | # this setting.
|
|---|
| 836 | if (deb) print "setting", i
|
|---|
| 837 | deflt = defaults[i]
|
|---|
| 838 | # Remove any spurious trailing spaces
|
|---|
| 839 | sub(/ *$/,"",deflt)
|
|---|
| 840 | # A leading @ means leave it unquoted so the preprocessor
|
|---|
| 841 | # can substitute the build time value
|
|---|
| 842 | if (deflt ~ /^ @/)
|
|---|
| 843 | deflt = " " subs substr(deflt, 3) sube
|
|---|
| 844 | print "" >out
|
|---|
| 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
|
|---|
| 851 | else
|
|---|
| 852 | print "#ifndef PNG_" r[j] >out
|
|---|
| 853 | print error, i, "requires", r[j] end >out
|
|---|
| 854 | print "# endif" >out
|
|---|
| 855 | }
|
|---|
| 856 | # The precedence is:
|
|---|
| 857 | #
|
|---|
| 858 | # 1) External definition; trumps:
|
|---|
| 859 | # 2) Option 'sets' value; trumps:
|
|---|
| 860 | # 3) Setting 'default'
|
|---|
| 861 | #
|
|---|
| 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
|
|---|
| 875 | }
|
|---|
| 876 | print "# endif /* defaults */" >out
|
|---|
| 877 | print "#endif /* setting", i, "*/" >out
|
|---|
| 878 |
|
|---|
| 879 | doneset[i] = 1
|
|---|
| 880 | ++movement
|
|---|
| 881 | }
|
|---|
| 882 |
|
|---|
| 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]
|
|---|
| 887 | }
|
|---|
| 888 | exit 1
|
|---|
| 889 | }
|
|---|
| 890 | }
|
|---|
| 891 | print "PNG_DFN_END_SORT" >out
|
|---|
| 892 | print comment, "end of settings", cend >out
|
|---|
| 893 |
|
|---|
| 894 | # Regular end - everything looks ok
|
|---|
| 895 | if (protect != "") {
|
|---|
| 896 | print start "#endif", "/*", protect, "*/" end >out
|
|---|
| 897 | }
|
|---|
| 898 | }
|
|---|
