From 3fcc7674e16813ea6c6ffffbefdd5ebb83b5ef31 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kirill=20M=C3=BCller?= <kirill@cynkra.com>
Date: Sun, 27 Apr 2025 07:37:04 +0200
Subject: [PATCH] feat: Add `Config/build/never-clean` option to never clean
 during build

---
 R/compile-dll.R | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/R/compile-dll.R b/R/compile-dll.R
index 4103f87..f1e6cf7 100644
--- a/R/compile-dll.R
+++ b/R/compile-dll.R
@@ -209,6 +209,11 @@ needs_compile <- function(path = ".") {
 # Does the package need a clean compile?
 # (i.e. is there a header or Makevars newer than the dll)
 needs_clean <- function(path = ".") {
+  never_clean <- get_desc_config_flag(path, "never-clean")
+  if (isTRUE(never_clean)) {
+    return(FALSE)
+  }
+
   headers <- mtime(headers(path))
   # no headers, so never needs clean compile
   if (is.null(headers)) {