--- old/make/hotspot/gensrc/GensrcAdlc.gmk	2020-02-06 19:17:49.892551513 +0100
+++ new/make/hotspot/gensrc/GensrcAdlc.gmk	2020-02-06 19:17:49.721551528 +0100
@@ -136,6 +136,12 @@
       $d/os_cpu/$(HOTSPOT_TARGET_OS)_$(HOTSPOT_TARGET_CPU_ARCH)/$(HOTSPOT_TARGET_OS)_$(HOTSPOT_TARGET_CPU_ARCH).ad \
     )))
 
+  ifeq ($(call check-jvm-feature, shenandoahgc), true)
+    AD_SRC_FILES += $(call uniq, $(wildcard $(foreach d, $(AD_SRC_ROOTS), \
+        $d/cpu/$(HOTSPOT_TARGET_CPU_ARCH)/gc/shenandoah/shenandoah_$(HOTSPOT_TARGET_CPU).ad \
+      )))
+  endif
+
   SINGLE_AD_SRCFILE := $(ADLC_SUPPORT_DIR)/all-ad-src.ad
 
   INSERT_FILENAME_AWK_SCRIPT := \