doc: Update Doxyfile

It gives:

Warning: Tag `SYMBOL_CACHE_SIZE' at line 346 of file doc/Doxyfile has become obsolete.
To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"

So run 'doxygen -u' as suggested.

Signed-off-by: Ran Benita <ran234@gmail.com>

doc/Doxyfile.in

@@ -1,8 +1,10 @@
-# Doxyfile 1.8.3.1
+# Doxyfile 1.8.4
 
 # This file describes the settings to be used by the documentation system
 # doxygen (www.doxygen.org) for a project.
 #
+# All text after a double hash (##) is considered a comment and is placed
+# in front of the TAG it is preceding .
 # All text after a hash (#) is considered a comment and will be ignored.
 # The format is:
 #       TAG = value [value, ...]
@@ -70,9 +72,9 @@ CREATE_SUBDIRS         = NO
 # Afrikaans, Arabic, Brazilian, Catalan, Chinese, Chinese-Traditional,
 # Croatian, Czech, Danish, Dutch, Esperanto, Farsi, Finnish, French, German,
 # Greek, Hungarian, Italian, Japanese, Japanese-en (Japanese with English
-# messages), Korean, Korean-en, Lithuanian, Norwegian, Macedonian, Persian,
+# messages), Korean, Korean-en, Latvian, Lithuanian, Norwegian, Macedonian,
-# Polish, Portuguese, Romanian, Russian, Serbian, Serbian-Cyrillic, Slovak,
+# Persian, Polish, Portuguese, Romanian, Russian, Serbian, Serbian-Cyrillic,
-# Slovene, Spanish, Swedish, Ukrainian, and Vietnamese.
+# Slovak, Slovene, Spanish, Swedish, Ukrainian, and Vietnamese.
 
 OUTPUT_LANGUAGE        = English
 
@@ -252,10 +254,10 @@ EXTENSION_MAPPING      = no_extension=md
 
 MARKDOWN_SUPPORT       = YES
 
-# When enabled doxygen tries to link words that correspond to documented classes,
+# When enabled doxygen tries to link words that correspond to documented
-# or namespaces to their corresponding documentation. Such a link can be
+# classes, or namespaces to their corresponding documentation. Such a link can
-# prevented in individual cases by by putting a % sign in front of the word or
+# be prevented in individual cases by by putting a % sign in front of the word
-# globally by setting AUTOLINK_SUPPORT to NO.
+# or globally by setting AUTOLINK_SUPPORT to NO.
 
 AUTOLINK_SUPPORT       = YES
 
@@ -311,11 +313,11 @@ SUBGROUPING            = YES
 INLINE_GROUPED_CLASSES = NO
 
 # When the INLINE_SIMPLE_STRUCTS tag is set to YES, structs, classes, and
-# unions with only public data fields will be shown inline in the documentation
+# unions with only public data fields or simple typedef fields will be shown
-# of the scope in which they are defined (i.e. file, namespace, or group
+# inline in the documentation of the scope in which they are defined (i.e. file,
-# documentation), provided this scope is documented. If set to NO (the default),
+# namespace, or group documentation), provided this scope is documented. If set
-# structs, classes, and unions are shown on a separate page (for HTML and Man
+# to NO (the default), structs, classes, and unions are shown on a separate
-# pages) or section (for LaTeX and RTF).
+# page (for HTML and Man pages) or section (for LaTeX and RTF).
 
 INLINE_SIMPLE_STRUCTS  = NO
 
@@ -329,30 +331,14 @@ INLINE_SIMPLE_STRUCTS  = NO
 
 TYPEDEF_HIDES_STRUCT   = NO
 
-# The SYMBOL_CACHE_SIZE determines the size of the internal cache use to
+# The size of the symbol lookup cache can be set using LOOKUP_CACHE_SIZE. This
-# determine which symbols to keep in memory and which to flush to disk.
+# cache is used to resolve symbols given their name and scope. Since this can
-# When the cache is full, less often used symbols will be written to disk.
+# be an expensive process and often the same symbol appear multiple times in
-# For small to medium size projects (<1000 input files) the default value is
+# the code, doxygen keeps a cache of pre-resolved symbols. If the cache is too
-# probably good enough. For larger projects a too small cache size can cause
+# small doxygen will become slower. If the cache is too large, memory is wasted.
-# doxygen to be busy swapping symbols to and from disk most of the time
+# The cache size is given by this formula: 2^(16+LOOKUP_CACHE_SIZE). The valid
-# causing a significant performance penalty.
+# range is 0..9, the default is 0, corresponding to a cache size of 2^16 = 65536
-# If the system has enough physical memory increasing the cache will improve the
+# symbols.
-# performance by keeping more symbols in memory. Note that the value works on
-# a logarithmic scale so increasing the size by one will roughly double the
-# memory usage. The cache size is given by this formula:
-# 2^(16+SYMBOL_CACHE_SIZE). The valid range is 0..9, the default is 0,
-# corresponding to a cache size of 2^16 = 65536 symbols.
-
-SYMBOL_CACHE_SIZE      = 0
-
-# Similar to the SYMBOL_CACHE_SIZE the size of the symbol lookup cache can be
-# set using LOOKUP_CACHE_SIZE. This cache is used to resolve symbols given
-# their name and scope. Since this can be an expensive process and often the
-# same symbol appear multiple times in the code, doxygen keeps a cache of
-# pre-resolved symbols. If the cache is too small doxygen will become slower.
-# If the cache is too large, memory is wasted. The cache size is given by this
-# formula: 2^(16+LOOKUP_CACHE_SIZE). The valid range is 0..9, the default is 0,
-# corresponding to a cache size of 2^16 = 65536 symbols.
 
 LOOKUP_CACHE_SIZE      = 0
 
@@ -363,7 +349,7 @@ LOOKUP_CACHE_SIZE      = 0
 # If the EXTRACT_ALL tag is set to YES doxygen will assume all entities in
 # documentation are documented, even if no documentation was available.
 # Private class members and static file members will be hidden unless
-# the EXTRACT_PRIVATE and EXTRACT_STATIC tags are set to YES
+# the EXTRACT_PRIVATE respectively EXTRACT_STATIC tags are set to YES
 
 EXTRACT_ALL            = NO
 
@@ -668,7 +654,8 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  = @abs_top_srcdir@/xkbcommon @abs_top_srcdir@/README
+INPUT                  = @abs_top_srcdir@/xkbcommon \
+                         @abs_top_srcdir@/README
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is
@@ -686,7 +673,8 @@ INPUT_ENCODING         = UTF-8
 # *.hxx *.hpp *.h++ *.idl *.odl *.cs *.php *.php3 *.inc *.m *.mm *.dox *.py
 # *.f90 *.f *.for *.vhd *.vhdl
 
-FILE_PATTERNS          = *.c *.h
+FILE_PATTERNS          = *.c \
+                         *.h
 
 # The RECURSIVE tag can be used to turn specify whether or not subdirectories
 # should be searched for input files as well. Possible values are YES and NO.
@@ -756,8 +744,10 @@ IMAGE_PATH             =
 # is the value of the INPUT_FILTER tag, and <input-file> is the name of an
 # input file. Doxygen will then use the output that the filter program writes
 # to standard output.
-# If FILTER_PATTERNS is specified, this tag will be
+# If FILTER_PATTERNS is specified, this tag will be ignored.
-# ignored.
+# Note that the filter must not add or remove lines; it is applied before the
+# code is scanned, but not when the output code is generated. If lines are added
+# or removed, the anchors will not be placed correctly.
 
 INPUT_FILTER           =
 
@@ -787,11 +777,11 @@ FILTER_SOURCE_FILES    = NO
 FILTER_SOURCE_PATTERNS =
 
 # If the USE_MD_FILE_AS_MAINPAGE tag refers to the name of a markdown file that
-# is part of the input, its contents will be placed on the main page (index.html).
+# is part of the input, its contents will be placed on the main page
-# This can be useful if you have a project on for instance GitHub and want reuse
+# (index.html). This can be useful if you have a project on for instance GitHub
-# the introduction page also for the doxygen output.
+# and want reuse the introduction page also for the doxygen output.
 
-#USE_MDFILE_AS_MAINPAGE =
+USE_MDFILE_AS_MAINPAGE =
 
 #---------------------------------------------------------------------------
 # configuration options related to source browsing
@@ -870,7 +860,8 @@ COLS_IN_ALPHA_INDEX    = 5
 # The IGNORE_PREFIX tag can be used to specify one or more prefixes that
 # should be ignored while generating the index headers.
 
-IGNORE_PREFIX          = xkb_ XKB_
+IGNORE_PREFIX          = xkb_ \
+                         XKB_
 
 #---------------------------------------------------------------------------
 # configuration options related to the HTML output
@@ -934,7 +925,7 @@ HTML_EXTRA_STYLESHEET  =
 # The HTML_EXTRA_FILES tag can be used to specify one or more extra images or
 # other source files which should be copied to the HTML output directory. Note
 # that these files will be copied to the base HTML output directory. Use the
-# $relpath$ marker in the HTML_HEADER and/or HTML_FOOTER files to load these
+# $relpath^ marker in the HTML_HEADER and/or HTML_FOOTER files to load these
 # files. In the HTML_STYLESHEET file, use the file name only. Also note that
 # the files will be copied as-is; there are no commands or markers available.
 
@@ -1203,11 +1194,11 @@ FORMULA_TRANSPARENT    = YES
 USE_MATHJAX            = NO
 
 # When MathJax is enabled you can set the default output format to be used for
-# thA MathJax output. Supported types are HTML-CSS, NativeMML (i.e. MathML) and
+# the MathJax output. Supported types are HTML-CSS, NativeMML (i.e. MathML) and
 # SVG. The default value is HTML-CSS, which is slower, but has the best
 # compatibility.
 
-#MATHJAX_FORMAT         = HTML-CSS
+MATHJAX_FORMAT         = HTML-CSS
 
 # When MathJax is enabled you need to specify the location relative to the
 # HTML output directory using the MATHJAX_RELPATH option. The destination
@@ -1226,6 +1217,11 @@ MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
 
 MATHJAX_EXTENSIONS     =
 
+# The MATHJAX_CODEFILE tag can be used to specify a file with javascript
+# pieces of code that will be used on startup of the MathJax code.
+
+MATHJAX_CODEFILE       =
+
 # When the SEARCHENGINE tag is enabled doxygen will generate a search box
 # for the HTML output. The underlying search engine uses javascript
 # and DHTML and should work on any modern browser. Note that when using
@@ -1251,10 +1247,10 @@ SERVER_BASED_SEARCH    = NO
 # which needs to be processed by an external indexer. Doxygen will invoke an
 # external search engine pointed to by the SEARCHENGINE_URL option to obtain
 # the search results. Doxygen ships with an example indexer (doxyindexer) and
-# search engine (doxysearch.cgi) which are based on the open source search engine
+# search engine (doxysearch.cgi) which are based on the open source search
-# library Xapian. See the manual for configuration details.
+# engine library Xapian. See the manual for configuration details.
 
-#EXTERNAL_SEARCH        = NO
+EXTERNAL_SEARCH        = NO
 
 # The SEARCHENGINE_URL should point to a search engine hosted by a web server
 # which will returned the search results when EXTERNAL_SEARCH is enabled.
@@ -1262,20 +1258,20 @@ SERVER_BASED_SEARCH    = NO
 # the open source search engine library Xapian. See the manual for configuration
 # details.
 
-#SEARCHENGINE_URL       =
+SEARCHENGINE_URL       =
 
 # When SERVER_BASED_SEARCH and EXTERNAL_SEARCH are both enabled the unindexed
 # search data is written to a file for indexing by an external tool. With the
 # SEARCHDATA_FILE tag the name of this file can be specified.
 
-#SEARCHDATA_FILE        = searchdata.xml
+SEARCHDATA_FILE        = searchdata.xml
 
 # When SERVER_BASED_SEARCH AND EXTERNAL_SEARCH are both enabled the
 # EXTERNAL_SEARCH_ID tag can be used as an identifier for the project. This is
 # useful in combination with EXTRA_SEARCH_MAPPINGS to search through multiple
 # projects and redirect the results back to the right project.
 
-#EXTERNAL_SEARCH_ID     =
+EXTERNAL_SEARCH_ID     =
 
 # The EXTRA_SEARCH_MAPPINGS tag can be used to enable searching through doxygen
 # projects other than the one defined by this configuration file, but that are
@@ -1284,7 +1280,7 @@ SERVER_BASED_SEARCH    = NO
 # of to a relative location where the documentation can be found.
 # The format is: EXTRA_SEARCH_MAPPINGS = id1=loc1 id2=loc2 ...
 
-#EXTRA_SEARCH_MAPPINGS  =
+EXTRA_SEARCH_MAPPINGS  =
 
 #---------------------------------------------------------------------------
 # configuration options related to the LaTeX output
@@ -1323,7 +1319,7 @@ COMPACT_LATEX          = NO
 
 # The PAPER_TYPE tag can be used to set the paper type that is used
 # by the printer. Possible values are: a4, letter, legal and
-# executive. If left blank a4wide will be used.
+# executive. If left blank a4 will be used.
 
 PAPER_TYPE             = a4
 
@@ -1346,6 +1342,13 @@ LATEX_HEADER           =
 
 LATEX_FOOTER           =
 
+# The LATEX_EXTRA_FILES tag can be used to specify one or more extra images
+# or other source files which should be copied to the LaTeX output directory.
+# Note that the files will be copied as-is; there are no commands or markers
+# available.
+
+LATEX_EXTRA_FILES      =
+
 # If the PDF_HYPERLINKS tag is set to YES, the LaTeX that is generated
 # is prepared for conversion to pdf (using ps2pdf). The pdf file will
 # contain links (just like the HTML output) instead of page references
@@ -1490,6 +1493,21 @@ XML_DTD                =
 
 XML_PROGRAMLISTING     = YES
 
+#---------------------------------------------------------------------------
+# configuration options related to the DOCBOOK output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_DOCBOOK tag is set to YES Doxygen will generate DOCBOOK files
+# that can be used to generate PDF.
+
+GENERATE_DOCBOOK       = NO
+
+# The DOCBOOK_OUTPUT tag is used to specify where the DOCBOOK pages will be put.
+# If a relative path is entered the value of OUTPUT_DIRECTORY will be put in
+# front of it. If left blank docbook will be used as the default path.
+
+DOCBOOK_OUTPUT         = docbook
+
 #---------------------------------------------------------------------------
 # configuration options for the AutoGen Definitions output
 #---------------------------------------------------------------------------
@@ -1639,6 +1657,12 @@ ALLEXTERNALS           = NO
 
 EXTERNAL_GROUPS        = YES
 
+# If the EXTERNAL_PAGES tag is set to YES all external pages will be listed
+# in the related pages index. If set to NO, only the current project's
+# pages will be listed.
+
+EXTERNAL_PAGES         = YES
+
 # The PERL_PATH should be the absolute path and name of the perl script
 # interpreter (i.e. the result of `which perl').
 
@@ -1735,7 +1759,7 @@ UML_LOOK               = NO
 # the class node. If there are many fields or methods and many nodes the
 # graph may become too big to be useful. The UML_LIMIT_NUM_FIELDS
 # threshold limits the number of items for each type to make the size more
-# managable. Set this to 0 for no limit. Note that the threshold may be
+# manageable. Set this to 0 for no limit. Note that the threshold may be
 # exceeded by 50% before the limit is enforced.
 
 UML_LIMIT_NUM_FIELDS   = 10