Add doxygen documentation to the build system

.gitignore

@@ -32,6 +32,11 @@ Makefile.in
 /stamp-h1
 /tags
 
+/doc/doxygen
+/doc/doxygen.cfg
+/doc/html/
+/doc/latex/
+
 /examples/aladin
 /examples/atom2
 /examples/d9

Makefile.am

@@ -4,6 +4,10 @@ if ENABLE_EXAMPLES
 SUBDIRS += examples
 endif
 
+if ENABLE_DOC
+SUBDIRS += doc
+endif
+
 AM_MAKEFLAGS = -s
 ACLOCAL_AMFLAGS = -I m4
 

configure.ac

@@ -53,9 +53,19 @@ AC_ARG_ENABLE([examples],
 	[], [enable_examples=yes])
 AM_CONDITIONAL([ENABLE_EXAMPLES], [test "x$enable_examples" = "xyes"])
 
+# Documentation.
+AC_ARG_ENABLE([doc],
+	[AS_HELP_STRING([--enable-doc=@<:@yes/no@:>@],
+		[Build documentation @<:@default=yes@:>@])],
+	[], [enable_doc=yes])
+AM_CONDITIONAL([ENABLE_DOC], [test "x$enable_doc" = "xyes"])
+
 # Checks for programs.
 AC_PROG_CC
 AC_PROG_CC_C99
+AC_CHECK_PROGS([DOXYGEN], [doxygen])
+
+AM_CONDITIONAL([HAVE_DOXYGEN],[test -n "$DOXYGEN"])
 
 # Enable automake silent build rules.
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
@@ -159,6 +169,8 @@ AC_CONFIG_FILES([
    include/libdivecomputer/version.h
    src/Makefile
    src/libdivecomputer.rc
+   doc/Makefile
+   doc/doxygen.cfg
    examples/Makefile
 ])
 AC_OUTPUT

doc/Makefile.am

@@ -0,0 +1,12 @@
+doxygen: doxygen.cfg
+if HAVE_DOXYGEN
+	$(DOXYGEN) $(DOXYFLAGS) $<
+	touch $@
+endif
+
+all-local: doxygen
+
+clean-local:
+	-$(RM) -rf html latex
+
+CLEANFILES = doxygen