Compilation mode locus should use the same window

lisp/hacks/comp-mode-locus-override.el

@@ -0,0 +1,53 @@
+;;; comp-mode-locus-override.el ---  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2026 Benson Chu
+
+;; Author: Benson Chu <bensonchu457@gmail.com>
+;; Created: [2026-04-12 10:41]
+
+;; This file is not part of GNU Emacs
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(defvar compile-locus-display-window nil)
+(make-variable-buffer-local 'compile-locus-display-window)
+
+(defun my/compile-locus-some-window (buffer)
+  `(lambda (buffer alist)
+     (if (and compile-locus-display-window
+              (window-live-p compile-locus-display-window))
+         compile-locus-display-window
+       (setq
+        compile-locus-display-window
+        (let ((win (window-in-direction 'left (get-buffer-window ,buffer))))
+          (split-window-horizontally nil win))))))
+
+(defun my/compilation-goto-locus (orig &rest args)
+  (save-selected-window
+    (let ((display-buffer-overriding-action
+           `(display-buffer-use-some-window
+             (inhibit-same-window . t)
+             (some-window . ,(my/compile-locus-some-window (current-buffer))))))
+      (apply orig args))))
+
+(advice-add #'compilation-goto-locus
+            :around
+            #'my/compilation-goto-locus)
+
+(provide 'comp-mode-locus-override)
+;;; comp-mode-locus-override.el ends here

lisp/llvm-lib/my-comp-minor-mode.el

@@ -25,6 +25,7 @@
 ;;; Code:
 (require 'anaphora)
 (require 'llvm-buffer-chain)
+(require 'comp-mode-locus-override)
 
 (define-minor-mode compilation-minor-mode
   "Toggle Compilation minor mode.