Build doxygen documentation with separate CMakeLists.

Extracted CMakelists.txt to doc subdirectory.
Changed paths in doxyfile.in and CMakeLists accordingly.
added doc as subdirectory in main CMakeLists.txt.

CMakeLists.txt

@@ -55,21 +55,4 @@ endif(Boost_FOUND)
 
 add_subdirectory(sandbox)
 
-find_package(Doxygen)
-if(DOXYGEN_FOUND)
-
-  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/doc/doxygen.in" "${CMAKE_CURRENT_BINARY_DIR}/doxygen.cfg" @ONLY)
-  add_custom_target(doc
-    COMMAND ${DOXYGEN_EXECUTABLE} "${CMAKE_CURRENT_BINARY_DIR}/doxygen.cfg"
-    WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
-    COMMENT "Generating API documentation with Doxygen" VERBATIM
-    )
-
-  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/scripts/updatedoc.in" "${CMAKE_CURRENT_BINARY_DIR}/updatedoc.sh" @ONLY)
-  add_custom_target(update-doc
-    COMMAND "${CMAKE_CURRENT_BINARY_DIR}/updatedoc.sh"
-    DEPENDS doc
-    COMMENT "Copying documentation to gh-pages branch" VERBATIM
-    )
-
-endif(DOXYGEN_FOUND)
+add_subdirectory(doc)

doc/CMakeLists.txt

@@ -0,0 +1,18 @@
+find_package(Doxygen)
+if(DOXYGEN_FOUND)
+
+  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/doxygen.in" "${CMAKE_CURRENT_BINARY_DIR}/doxygen.cfg" @ONLY)
+  add_custom_target(doc
+    COMMAND ${DOXYGEN_EXECUTABLE} "${CMAKE_CURRENT_BINARY_DIR}/doxygen.cfg"
+    WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/.."
+    COMMENT "Generating API documentation with Doxygen" VERBATIM
+    )
+
+  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/../scripts/updatedoc.in" "${CMAKE_CURRENT_BINARY_DIR}/updatedoc.sh" @ONLY)
+  add_custom_target(update-doc
+    COMMAND "${CMAKE_CURRENT_BINARY_DIR}/updatedoc.sh"
+    DEPENDS doc
+    COMMENT "Copying documentation to gh-pages branch" VERBATIM
+    )
+
+endif(DOXYGEN_FOUND)

doc/doxygen.in

@@ -52,7 +52,7 @@ PROJECT_LOGO           =
 # 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       = doc
+OUTPUT_DIRECTORY       = @CMAKE_CURRENT_BINARY_DIR@/
 
 # 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
@@ -595,7 +595,7 @@ FILE_VERSION_FILTER    =
 # You can optionally specify a file name after the option, if omitted
 # DoxygenLayout.xml will be used as the name of the layout file.
 
-LAYOUT_FILE            = "@CMAKE_CURRENT_SOURCE_DIR@/doc/DoxygenLayout.xml"
+LAYOUT_FILE            = "@CMAKE_CURRENT_SOURCE_DIR@/DoxygenLayout.xml"
 
 # The CITE_BIB_FILES tag can be used to specify one or more bib files
 # containing the references data. This must be a list of .bib files. The
@@ -668,7 +668,7 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  = @CMAKE_CURRENT_SOURCE_DIR@/include @CMAKE_CURRENT_SOURCE_DIR@/doc #include doc
+INPUT                  = @CMAKE_CURRENT_SOURCE_DIR@/../include @CMAKE_CURRENT_SOURCE_DIR@/
 
 # 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
@@ -701,7 +701,7 @@ RECURSIVE              = YES
 # Note that relative paths are relative to the directory from which doxygen is
 # run.
 
-EXCLUDE                = external
+EXCLUDE                = @CMAKE_CURRENT_SOURCE_DIR@/../external
 
 # The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
 # directories that are symbolic links (a Unix file system feature) are excluded
@@ -911,7 +911,7 @@ HTML_HEADER            =
 # each generated HTML page. If it is left blank doxygen will generate a
 # standard footer.
 
-HTML_FOOTER            ="@CMAKE_CURRENT_SOURCE_DIR@/doc/footer.html"
+HTML_FOOTER            ="@CMAKE_CURRENT_SOURCE_DIR@/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