New option "dotspacemacs-load-prefer-newer" to control prefer newer

* core/core-dotspacemacs.el: New option "dotspacemacs-load-prefer-newer"
* core/templates/.spacemacs.template: Template changes for new option
* layers/+spacemacs/spacemacs-defaults/config.el: Apply the new option

CHANGELOG.develop

@@ -3666,6 +3666,8 @@ files (thanks to Daniel Nicolai)
 **** Spacemacs-defaults
 - Updated spacemacs/save-as function, see github #8974 and #14754 (thanks to
   Daniel Nicolai and Lebensterben)
+- New option variable ~dotspacemacs-load-prefer-newer~ to control the variable
+  ~load-prefer-newer~ for Emacs (thanks to Lin Sun)
 **** Spotify
 - Replaced helm-spotify package with helm-spotify-plus
   (thanks to Leonard Lausen)

core/core-dotspacemacs.el

@@ -487,6 +487,12 @@ are kept or minimized by `spacemacs/toggle-maximize-window' (SPC w m)."
   'boolean
   'spacemacs-dotspacemacs-init)
 
+(spacemacs|defc dotspacemacs-load-prefer-newer nil
+  "If nil use the default value of `load-prefer-newer'. Otherwise prefer
+newer files to avoid loading outdated compiled ones."
+  'boolean
+  'spacemacs-dotspacemacs-init)
+
 (spacemacs|defc dotspacemacs-loading-progress-bar t
   "If non nil a progress bar is displayed when spacemacs is loading. This
 may increase the boot time on some systems and emacs builds, set it to nil

core/templates/.spacemacs.template

@@ -356,6 +356,11 @@ It should only modify the values of Spacemacs settings."
    ;; loading, otherwise do not try the `package-quickstart' (default nil).
    dotspacemacs-enable-package-quickstart nil
 
+   ;; If t, enable the `load-prefer-newer' to avoid loading outdated compiled
+   ;; files. Otherwise, do not change the value of `load-prefer-newer' (default
+   ;; is nil). It will affect the boot time on Windows.
+   dotspacemacs-load-prefer-newer nil
+
    ;; If non-nil a progress bar is displayed when spacemacs is loading. This
    ;; may increase the boot time on some systems and emacs builds, set it to
    ;; nil to boost the loading time. (default t)

layers/+spacemacs/spacemacs-defaults/config.el

@@ -255,7 +255,8 @@ or `nil' to only save and not visit the file."
 (add-hook 'kill-buffer-hook #'spacemacs//add-buffer-to-killed-list)
 
 ;; Don't load outdated compiled files.
-(setq load-prefer-newer t)
+(when dotspacemacs-load-prefer-newer
+  (setq load-prefer-newer t))
 
 ;; Suppress the *Warnings* buffer when native compilation shows warnings.
 (setq native-comp-async-report-warnings-errors 'silent)