allow documentation to be configured

Add --disable-doxygen-html and --enable-doxygen-pdf options to the
configure script, allowing user to change the defaults.  These
update the proess of munging the Doxygen configuration file to
use the settings thusly provided.  Add options in README.

Doxyfile.in

@@ -764,7 +764,7 @@ IGNORE_PREFIX          =
 # If the GENERATE_HTML tag is set to YES (the default) Doxygen will
 # generate HTML output.
 
-GENERATE_HTML          = YES
+GENERATE_HTML          = @doxygen_as_html@
 
 # The HTML_OUTPUT tag is used to specify where the HTML docs will be put.
 # If a relative path is entered the value of OUTPUT_DIRECTORY will be
@@ -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         = YES
+GENERATE_LATEX         = @doxygen_as_pdf@
 
 # 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

Makefile.am

@@ -25,7 +25,9 @@ Doxyfile: $(srcdir)/Doxyfile.in
 	@( \
 	  echo "### @@@ -= DO NOT EDIT THIS FILE =- @@@ ###" && \
 	  echo "### @@@ Make changes to Doxyfile.in @@@ ###" && \
-	  sed -e 's,@srcdir\@,$(srcdir),' $< \
+	  sed -e 's,@srcdir\@,$(srcdir),' \
+	    -e 's,@doxygen_as_html\@,$(doxygen_as_html),' \
+	    -e 's,@doxygen_as_pdf\@,$(doxygen_as_pdf),' $< \
 	) > $@
 
 THE_MANUAL = doxygen/latex/refman.pdf

README

@@ -258,6 +258,9 @@ options may be available there:
   --enable-httpd          Enable builtin httpd server - useful for standalone
                           OpenOCD implementations
 
+  --disable-doxygen-html Disable building Doxygen manual as HTML.
+  --enable-doxygen-pdf   Enable building Doxygen manual as PDF.
+
 Miscellaneous Configure Options
 -------------------------------
 

configure.in

@@ -277,6 +277,24 @@ AC_ARG_WITH(ftd2xx-lib,
   with_ftd2xx_lib=static
   ])
 
+
+AC_ARG_ENABLE(doxygen-html,
+  AS_HELP_STRING([--disable-doxygen-html],
+    [Disable building Doxygen manual as HTML.]),
+  [doxygen_as_html=$enableval], [doxygen_as_html=yes])
+AC_SUBST(doxygen_as_html)
+AC_MSG_CHECKING([whether to build Doxygen as HTML])
+AC_MSG_RESULT($doxygen_as_html)
+
+AC_ARG_ENABLE(doxygen-pdf,
+  AS_HELP_STRING([--enable-doxygen-pdf],
+    [Enable building Doxygen manual as PDF.]),
+  [doxygen_as_pdf=$enableval], [doxygen_as_pdf=no])
+AC_SUBST(doxygen_as_pdf)
+AC_MSG_CHECKING([whether to build Doxygen as PDF])
+AC_MSG_RESULT($doxygen_as_pdf)
+
+
 AC_ARG_ENABLE(gccwarnings,
   AS_HELP_STRING([--disable-gccwarnings], [Disable compiler warnings]),
   [gcc_warnings=$enableval], [gcc_warnings=yes])