master a773d7f05b: Fix native-compilation at startup

[Eli Zaretskii]

branch: master
commit a773d7f05b365e26bb070ed5f5a36d1f43003777
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Fix native-compilation at startup
    
    * lisp/startup.el (normal-top-level): Set up the initial value of
    'native-comp-eln-load-path' early into startup, then amend it
    after calling 'command-line'.  (Bug#53497)
---
 lisp/startup.el | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/lisp/startup.el b/lisp/startup.el
index 66dd726ae9..b45cfbbdc3 100644
--- a/lisp/startup.el
+++ b/lisp/startup.el
@@ -558,6 +558,27 @@ It is the default value of the variable `top-level'."
     (setq user-emacs-directory
          (startup--xdg-or-homedot startup--xdg-config-home-emacs nil))
 
+    (when (featurep 'native-compile)
+      ;; Form `native-comp-eln-load-path'.
+      (let ((path-env (getenv "EMACSNATIVELOADPATH")))
+        (when path-env
+          (dolist (path (split-string path-env path-separator))
+            (unless (string= "" path)
+              (push path native-comp-eln-load-path)))))
+      (push (expand-file-name "eln-cache/" user-emacs-directory)
+            native-comp-eln-load-path)
+      ;; When $HOME is set to '/nonexistent' means we are running the
+      ;; testsuite, add a temporary folder in front to produce there
+      ;; new compilations.
+      (when (and (equal (getenv "HOME") "/nonexistent")
+                 ;; We may be running in a chroot environment where we
+                 ;; can't write anything.
+                 (file-writable-p (expand-file-name
+                                   (or temporary-file-directory ""))))
+        (let ((tmp-dir (make-temp-file "emacs-testsuite-" t)))
+          (add-hook 'kill-emacs-hook (lambda () (delete-directory tmp-dir t)))
+          (push tmp-dir native-comp-eln-load-path))))
+
     ;; Look in each dir in load-path for a subdirs.el file.  If we
     ;; find one, load it, which will add the appropriate subdirs of
     ;; that dir into load-path.  This needs to be done before setting
@@ -644,6 +665,16 @@ It is the default value of the variable `top-level'."
                (set pathsym (mapcar (lambda (dir)
                                       (decode-coding-string dir coding t))
                                     path)))))
+        (when (featurep 'native-compile)
+          (let ((npath (symbol-value 'native-comp-eln-load-path)))
+            (set 'native-comp-eln-load-path
+                 (mapcar (lambda (dir)
+                           ;; Call expand-file-name to remove all the
+                           ;; pesky ".." from the directyory names in
+                           ;; native-comp-eln-load-path.
+                           (expand-file-name
+                            (decode-coding-string dir coding t)))
+                         npath))))
        (dolist (filesym '(data-directory doc-directory exec-directory
                                          installation-directory
                                          invocation-directory invocation-name
@@ -801,6 +832,34 @@ It is the default value of the variable `top-level'."
        (unless inhibit-startup-hooks
          (run-hooks 'window-setup-hook))))
 
+    ;; Amend `native-comp-eln-load-path' after `command-line', since
+    ;; the latter may have altered `user-emacs-directory'.
+    (let ((tmp-dir (and (equal (getenv "HOME") "/nonexistent")
+                        (file-writable-p (expand-file-name
+                                          (or temporary-file-directory "")))
+                        (car native-comp-eln-load-path)))
+          (coding (if (eq system-type 'windows-nt)
+                     'utf-8
+                   locale-coding-system)))
+      (if tmp-dir
+          (setq native-comp-eln-load-path
+                (cdr native-comp-eln-load-path)))
+      ;; Remove the original eln-cache.
+      (setq native-comp-eln-load-path
+            (cdr native-comp-eln-load-path))
+      ;; Add the new eln-cache.
+      (push (expand-file-name "eln-cache/"
+                              (if coding
+                                  (decode-coding-string user-emacs-directory
+                                                        coding t)
+                                user-emacs-directory))
+            native-comp-eln-load-path)
+      (when tmp-dir
+        ;; Recompute tmp-dir, in case user-emacs-directory affects it.
+        (setq tmp-dir (make-temp-file "emacs-testsuite-" t))
+        (add-hook 'kill-emacs-hook (lambda () (delete-directory tmp-dir t)))
+        (push tmp-dir native-comp-eln-load-path)))
+
     ;; Subprocesses of Emacs do not have direct access to the terminal, so
     ;; unless told otherwise they should only assume a dumb terminal.
     ;; We are careful to do it late (after term-setup-hook), although the