diff --git a/core/autoload/process.el b/core/autoload/process.el
index 66d5d6a8c..46f4d28fc 100644
--- a/core/autoload/process.el
+++ b/core/autoload/process.el
@@ -40,3 +40,21 @@ Warning: freezes indefinitely on any stdin prompt."
               (sit-for 0.1))
             (process-exit-status process))
           (string-trim (buffer-string)))))
+
+(defvar doom-num-cpus nil)
+;;;###autoload
+(defun doom-num-cpus ()
+  "Return the max number of processing units on this system.
+Tries to be portable. Returns 1 if cannot be determined."
+  (or doom-num-cpus
+      (setq doom-num-cpus
+            (max
+             1 (cond ((eq 'windows-nt system-type)
+                      (or (ignore-errors
+                            (string-to-number (getenv "NUMBER_OF_PROCESSORS")))
+                          1))
+                     ((executable-find "nproc")
+                      (string-to-number (cdr (doom-call-process "nproc"))))
+                     ((and IS-MAC (executable-find "sysctl"))
+                      (string-to-number (cdr (doom-call-process "sysctl" "-n" "hw.ncpu"))))
+                     (t 1))))))
diff --git a/core/core.el b/core/core.el
index 3c5e39125..27499a5f0 100644
--- a/core/core.el
+++ b/core/core.el
@@ -299,13 +299,7 @@ config.el instead."
   (defadvice! doom--comp-use-all-cores-a ()
     :override #'comp-effective-async-max-jobs
     (if (zerop comp-async-jobs-number)
-        (or comp-num-cpus
-            (setf comp-num-cpus
-                  (max 1 (cond ((eq 'windows-nt system-type)
-                                (string-to-number (getenv "NUMBER_OF_PROCESSORS")))
-                               ((executable-find "nproc")
-                                (string-to-number (cdr (doom-call-process "nproc"))))
-                               (t 1)))))
+        (setq comp-num-cpus (doom-num-cpus))
       comp-async-jobs-number)))
 
 
diff --git a/modules/lang/cc/config.el b/modules/lang/cc/config.el
index ac682ee92..fc0d0f4f4 100644
--- a/modules/lang/cc/config.el
+++ b/modules/lang/cc/config.el
@@ -294,12 +294,9 @@ If rtags or rdm aren't available, fail silently instead of throwing a breaking e
     ccls-sem-highlight-method (if lsp-enable-semantic-highlighting
                                   ccls-sem-highlight-method))
   (when (or IS-MAC IS-LINUX)
-    (let ((cpu-count-command (cond (IS-MAC '("sysctl" "-n" "hw.ncpu"))
-                                   (IS-LINUX '("nproc"))
-                                   (t (error "unreachable code")))))
-      (setq ccls-initialization-options
-            `(:index (:trackDependency 1
-                      :threads ,(max 1 (/ (string-to-number (cdr (apply #'doom-call-process cpu-count-command))) 2)))))))
+    (setq ccls-initialization-options
+          `(:index (:trackDependency 1
+                    :threads ,(max 1 (/ (doom-num-cpus) 2))))))
   (when IS-MAC
     (setq ccls-initialization-options
           (append ccls-initialization-options