GNU bug report logs - #80066
cedet semantic-ia-fast-jump broken with c-ts-mode/c++-ts-mode

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: gynamics <dybfysiat <at> 163.com>
To: bug-gnu-emacs <at> gnu.org
Subject: cedet semantic-ia-fast-jump broken with c-ts-mode/c++-ts-mode
Date: Tue, 23 Dec 2025 23:08:07 +0800

Platform: x86_64/arm64 Linux

Emacs version: 30.2

Tree-sitter version: 0.25.10

System GCC version: 15.2.1

How-to-reproduce:

A minimal configuration for treesit:

(setq treesit-language-source-alist
      '((c "https://github.com/tree-sitter/tree-sitter-c")
        (cpp "https://github.com/tree-sitter/tree-sitter-cpp")))

(setq major-mode-remap-alist
      '((c-mode . c-ts-mode)
        (c++-mode . c++-ts-mode)))

;; append *-mode-hook to *-ts-mode-hook for modes in `major-mode-remap-list'
(mapc
 #'(lambda (major-mode-remap)
     (let ((major-mode-hook
            (intern (concat (symbol-name (car major-mode-remap)) "-hook")))
           (major-ts-mode-hook
            (intern (concat (symbol-name (cdr major-mode-remap)) 
"-hook"))))
       (add-hook major-ts-mode-hook
                 `(lambda () (run-hooks ',major-mode-hook)))))
 major-mode-remap-alist)

1. Download treesit dlls with treesit-install-language-grammar. Make 
sure c-ts-mode works in your Emacs.

2. Enable semantic-mode in a helloworld C source file, and try to call 
semantic-ia-fast-jump on a system symbol like printf. The expected 
behavior (which can be observed with emacs -q) is jumping into stdio.h, 
but with configurations above, it will show an error message:

semantic-ia-fast-jump: Could not find suitable jump point for printf

I have also tested c-ts-mode independently, this problem still exists.

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