doc: fix out-of-tree build

When building outside of the source tree, the Doxyfile needs to be
generated in the build tree and should point to the proper paths for
include directories and html footer.

The generated api files to install should also be taken from the build
tree instead of the source tree.

Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>

configure.ac

@@ -431,6 +431,7 @@ AC_CONFIG_FILES([ \
 	include/share/Makefile \
 	include/share/grabbag/Makefile \
 	include/test_libs_common/Makefile \
+	doc/Doxyfile \
 	doc/Makefile \
 	doc/html/Makefile \
 	doc/html/images/Makefile \

doc/Doxyfile.in

@@ -451,8 +451,8 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories 
 # with spaces.
 
-INPUT                  = ../include/FLAC \
-                         ../include/FLAC++
+INPUT                  = @top_srcdir@/include/FLAC \
+                         @top_srcdir@/include/FLAC++
 
 # If the value of the INPUT tag contains directories, you can use the 
 # FILE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp 
@@ -632,7 +632,7 @@ HTML_HEADER            =
 # each generated HTML page. If it is left blank doxygen will generate a 
 # standard footer.
 
-HTML_FOOTER            = doxygen.footer.html
+HTML_FOOTER            = @top_srcdir@/doc/doxygen.footer.html
 
 # The HTML_STYLESHEET tag can be used to specify a user-defined cascading 
 # style sheet that is used by each HTML page. It can be used to 

doc/Makefile.am

@@ -18,6 +18,7 @@
 SUBDIRS = . html
 
 if FLaC__HAS_DOXYGEN
+all-local: Doxyfile
 FLAC.tag: Doxyfile
 	doxygen Doxyfile
 	rm -rf html/api
@@ -35,7 +36,7 @@ docdir = $(datadir)/doc/$(PACKAGE)-$(VERSION)
 doc_DATA = \
 	FLAC.tag
 
-EXTRA_DIST = Doxyfile Makefile.lite doxygen.footer.html doxygen.header.html $(doc_DATA)
+EXTRA_DIST = Doxyfile.in Makefile.lite doxygen.footer.html doxygen.header.html $(doc_DATA)
 
 maintainer-clean-local:
 	rm -rf FLAC.tag html/api doxytmp

doc/html/Makefile.am

@@ -72,7 +72,7 @@ if FLaC__HAS_DOXYGEN
 # handle 'api/' specially:
 install-data-local:
 	$(mkinstalldirs) $(DESTDIR)$(docdir)/api
-	(cd $(srcdir)/api && $(INSTALL_DATA) * $(DESTDIR)$(docdir)/api)
+	(cd $(builddir)/api && $(INSTALL_DATA) * $(DESTDIR)$(docdir)/api)
 uninstall-local:
 	rm -rf $(DESTDIR)$(docdir)/api
 maintainer-clean-local: