问题
I have installed official CEDET 2.0 using el-get on GNU Emacs 24.3 and configured it. Although it works great for code jump and completion, it cannot work properly with Emacs built-in which-function-mode. When the major modes is Java mode, the Emacs mode line simply displays [???], like no valid function is recognized. But when I removed my CEDET configuration, which-function-mode works well. So I think the problem should be related to the official CEDET 2.0. I tried to manually enable which-function-mode, the problem is still persist.
I cannot figure out where it goes wrong with my configuration.
Can anyone help? Thanks.
Update: If I disabled semantic by commenting out the line (semantic-mode 1), which-function-mode would work. I checked the CEDET documents, the semantic is enabled in the way as I did.
(add-to-list 'load-path (concat cedet-root-path "contrib"))
(add-to-list 'semantic-default-submodes 'global-semantic-mru-bookmark-mode)
(add-to-list 'semantic-default-submodes 'global-semanticdb-minor-mode)
(add-to-list 'semantic-default-submodes 'global-semantic-idle-scheduler-mode)
(add-to-list 'semantic-default-submodes 'global-cedet-m3-minor-mode)
(add-to-list 'semantic-default-submodes 'global-semantic-highlight-func-mode)
(add-to-list 'semantic-default-submodes 'global-semantic-idle-local-symbol-highlight-mode)
;; Activate semantic
(semantic-mode 1)
;; Load contrib library
(require 'eassist)
(when (not (member system-type '(gnu gnu/linux darwin cygwin)))
(if (executable-find "gcc")
(semantic-gcc-setup)
(message "GCC is not installed and semantic analysis will be restriced.")))
(setq pulse-flag 'never) ; No fade in/out effect
(setq semanticdb-default-save-directory
(expand-file-name "~/.emacs.d/semanticdb"))
(setq eassist-header-switches
'(("h" . ("cpp" "cxx" "c++" "CC" "cc" "C" "c" "mm" "m"))
("hh" . ("cc" "CC" "cpp" "cxx" "c++" "C"))
("hpp" . ("cpp" "cxx" "c++" "cc" "CC" "C"))
("hxx" . ("cxx" "cpp" "c++" "cc" "CC" "C"))
("h++" . ("c++" "cpp" "cxx" "cc" "CC" "C"))
("H" . ("C" "CC" "cc" "cpp" "cxx" "c++" "mm" "m"))
("HH" . ("CC" "cc" "C" "cpp" "cxx" "c++"))
("cpp" . ("hpp" "hxx" "h++" "HH" "hh" "H" "h"))
("cxx" . ("hxx" "hpp" "h++" "HH" "hh" "H" "h"))
("c++" . ("h++" "hpp" "hxx" "HH" "hh" "H" "h"))
("CC" . ("HH" "hh" "hpp" "hxx" "h++" "H" "h"))
("cc" . ("hh" "HH" "hpp" "hxx" "h++" "H" "h"))
("C" . ("hpp" "hxx" "h++" "HH" "hh" "H" "h"))
("c" . ("h"))
("m" . ("h"))
("mm" . ("h"))))
;; Save the current jump point in order to jump back when using CEDET
;; http://comments.gmane.org/gmane.emacs.cedet/5127
(defvar semantic-tags-location-ring (make-ring 512))
(defun semantic-goto-definition (point)
"Goto definition using semantic-ia-fast-jump
save the pointer marker if tag is found"
(interactive "d")
(condition-case err
(progn
(ring-insert semantic-tags-location-ring (point-marker))
(semantic-ia-fast-jump point))
(error
;;if not found remove the tag saved in the ring
(set-marker (ring-remove semantic-tags-location-ring 0) nil nil)
(signal (car err) (cdr err)))))
(defun semantic-pop-tag-mark ()
"popup the tag save by semantic-goto-definition"
(interactive)
(if (ring-empty-p semantic-tags-location-ring)
(message "%s" "No more tags available")
(let* ((marker (ring-remove semantic-tags-location-ring 0))
(buff (marker-buffer marker))
(pos (marker-position marker)))
(if (not buff)
(message "Buffer has been deleted")
(switch-to-buffer buff)
(goto-char pos))
(set-marker marker nil nil))))
(defun cedet-common-setup ()
(local-set-key (kbd "C-c j") 'semantic-goto-definition)
(local-set-key (kbd "C-c b") 'semantic-pop-tag-mark)
(local-set-key (kbd "C-c o") 'semantic-ia-show-summary)
(local-set-key (kbd "C-c d") 'semantic-ia-show-doc)
(local-set-key (kbd "C-c p") 'semantic-analyze-proto-impl-toggle)
(local-set-key (kbd "C-c f") 'semantic-symref)
(local-set-key (kbd "C-c r") 'semantic-symref-symbol)
(local-set-key (kbd "C-c <left>") 'semantic-tag-folding-fold-block)
(local-set-key (kbd "C-c <right>") 'semantic-tag-folding-show-block)
;; We use auto complete to get candidate
(if window-system
(local-set-key (kbd "M-n") 'semantic-ia-complete-symbol-menu))
(local-set-key (kbd "C-c m") 'eassist-list-methods))
(defun cedet-c-c++-setup ()
;; (local-set-key "." 'semantic-complete-self-insert)
;; (local-set-key ">" 'semantic-complete-self-insert)
(local-set-key (kbd "C-c h") 'eassist-switch-h-cpp) ; Jump between .c and .h
(when (executable-find "cscope")
(require 'cedet-cscope)
(require 'semantic/db-cscope)
(semanticdb-enable-cscope-databases)
(local-set-key (kbd "C-c i") 'cedet-cscope-create/update-database)))
(defun cedet-java-setup ()
(require 'cedet-java)
(require 'semantic/db-javap))
回答1:
The minor mode global-semantic-idle-breadcrumbs-mode is roughly similar to which-func-mode but uses the header instead of the mode line so it has more room to describe your context. There is also `global-semantic-stickyfunc-mode' which is also similar, but only shows what functions is partly off the top of the screen, not what the cursor is in.
To enable the original which-func-mode without disabling semantic, you may need to just disable the advice semantic uses for integration. Use ad-disable-advice for semantic-which to turn it off. The latest version of CEDET doesn't try to overload which-func so updating to the latest could work too.
来源：https://stackoverflow.com/questions/17119422/which-function-mode-cannot-work-with-official-cedet-2-0