Add script to check for byte-compile failures

Just a manual check for now.

build-helpers/byte-compile-check.el

@@ -0,0 +1,15 @@
+;; Run with emacs --script
+
+(let ((els))
+  (dolist (path load-path)
+    (dolist (el (file-expand-wildcards (expand-file-name "*.el" path)))
+      (unless (or (string-suffix-p "-pkg.el" el)
+                  (string-suffix-p "-theme.el" el)
+                  (string-suffix-p "-autoloads.el" el)
+                  (file-exists-p (concat el "c"))
+                  (with-temp-buffer
+                    (insert-file-contents el)
+                    ;; This is wrong, but close enough for our purposes.
+                    (search-forward "no-byte-compile: t" nil t)))
+        (push el els))))
+  (princ (string-join (seq-sort #'string< els) "\n")))

elisp-packages.nix

@@ -179,9 +179,8 @@
   # - xref-js2: upstream bug(?).
   #   Error: `add-to-list' can't use lexical var `words'; use `push' or `cl-pushnew'
   # - several others, looks like mostly missing (frequently optional) deps.
-  # TODO: add a way of checking for these.
-  # Currently I run:
-  # set edir (grep 'export emacsWithPackages_siteLisp=' result/bin/.emacs-wrapped | cut -f2 -d=); comm -3 (fd '\.el$' $edir | sort | psub) (fd '\.elc$' $edir | sed -e 's:c$::' | sort | psub ) | grep -E -v -- '-(autoloads|pkg|theme).el$' | xargs grep -L 'no-byte-compile: t'
+  #
+  # To check for these: `doom-emacs --script build-helpers/byte-compile-check.el`
 
   # TODO: clean up some more load-path clutter?
   #