update doxygen configuration to produce a PDF

A single PDF file for the developer manual allows accessing a single
index, browsing, and searching.  It takes significantly more time to
build this way, but this patch allows others to look at the results.

Migration Tip: If you have previously built the HTML Doxygen
documentatation, rename your 'doxygen' directory to 'doxygen/html'
to prevent needlessly rebuilding those files.

Doxyfile.in

@@ -38,7 +38,7 @@ PROJECT_NUMBER         =
 # If a relative path is entered, it will be relative to the location
 # where doxygen was started. If left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       =
+OUTPUT_DIRECTORY       = doxygen
 
 # If the CREATE_SUBDIRS tag is set to YES, then doxygen will create
 # 4096 sub-directories (in 2 levels) under the output directory of each output
@@ -770,7 +770,7 @@ GENERATE_HTML          = YES
 # If a relative path is entered the value of OUTPUT_DIRECTORY will be
 # put in front of it. If left blank `html' will be used as the default path.
 
-HTML_OUTPUT            = doxygen
+HTML_OUTPUT            = html
 
 # The HTML_FILE_EXTENSION tag can be used to specify the file extension for
 # each generated HTML page (for example: .htm,.php,.asp). If it is left blank
@@ -981,7 +981,7 @@ FORMULA_FONTSIZE       = 10
 # If the GENERATE_LATEX tag is set to YES (the default) Doxygen will
 # generate Latex output.
 
-GENERATE_LATEX         = NO
+GENERATE_LATEX         = YES
 
 # The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put.
 # If a relative path is entered the value of OUTPUT_DIRECTORY will be
@@ -992,7 +992,7 @@ LATEX_OUTPUT           = latex
 # The LATEX_CMD_NAME tag can be used to specify the LaTeX command name to be
 # invoked. If left blank `latex' will be used as the default command name.
 
-LATEX_CMD_NAME         = latex
+LATEX_CMD_NAME         = pdflatex
 
 # The MAKEINDEX_CMD_NAME tag can be used to specify the command name to
 # generate index for LaTeX. If left blank `makeindex' will be used as the
@@ -1004,7 +1004,7 @@ MAKEINDEX_CMD_NAME     = makeindex
 # LaTeX documents. This may be useful for small projects and may help to
 # save some trees in general.
 
-COMPACT_LATEX          = NO
+COMPACT_LATEX          = YES
 
 # The PAPER_TYPE tag can be used to set the paper type that is used
 # by the printer. Possible values are: a4, a4wide, letter, legal and
@@ -1029,20 +1029,20 @@ LATEX_HEADER           =
 # contain links (just like the HTML output) instead of page references
 # This makes the output suitable for online browsing using a pdf viewer.
 
-PDF_HYPERLINKS         = NO
+PDF_HYPERLINKS         = YES
 
 # If the USE_PDFLATEX tag is set to YES, pdflatex will be used instead of
 # plain latex in the generated Makefile. Set this option to YES to get a
 # higher quality PDF documentation.
 
-USE_PDFLATEX           = NO
+USE_PDFLATEX           = YES
 
 # If the LATEX_BATCHMODE tag is set to YES, doxygen will add the \\batchmode.
 # command to the generated LaTeX files. This will instruct LaTeX to keep
 # running if errors occur, instead of asking the user for help.
 # This option is also used when generating formulas in HTML.
 
-LATEX_BATCHMODE        = NO
+LATEX_BATCHMODE        = YES
 
 # If LATEX_HIDE_INDICES is set to YES then doxygen will not
 # include the index chapters (such as File Index, Compound Index, etc.)

Makefile.am

@@ -28,9 +28,16 @@ Doxyfile: $(srcdir)/Doxyfile.in
 	  sed -e 's,@srcdir\@,$(srcdir),' $< \
 	) > $@
 
+THE_MANUAL = doxygen/latex/refman.pdf
+
 doxygen::
 	$(MAKE) Doxyfile
 	doxygen Doxyfile 2>&1 | perl $(srcdir)/tools/logger.pl > doxygen.log
+	$(MAKE) $(THE_MANUAL)
+
+%.pdf: %.tex
+	-cd $$(dirname $*) && pdflatex $$(basename $*)
+	-cd $$(dirname $*) && pdflatex $$(basename $*)
 
 TCL_PATH = tcl
 # command to find paths of script files, relative to TCL_PATH