--- old/make/autoconf/hotspot.m4	2020-01-17 17:08:21.592136459 +0100
+++ new/make/autoconf/hotspot.m4	2020-01-17 17:08:21.488136465 +0100
@@ -25,7 +25,7 @@
 
 # All valid JVM features, regardless of platform
 VALID_JVM_FEATURES="compiler1 compiler2 zero minimal dtrace jvmti jvmci \
-    graal vm-structs jni-check services management cmsgc epsilongc g1gc parallelgc serialgc zgc nmt cds \
+    graal vm-structs jni-check services management cmsgc epsilongc g1gc parallelgc serialgc shenandoahgc zgc nmt cds \
     static-build link-time-opt aot jfr"
 
 # Deprecated JVM features (these are ignored, but with a warning)
@@ -338,6 +338,15 @@
     fi
   fi
 
+  # Only enable Shenandoah on supported arches
+  AC_MSG_CHECKING([if shenandoah can be built])
+  if test "x$OPENJDK_TARGET_CPU_ARCH" = "xx86" || test "x$OPENJDK_TARGET_CPU" = "xaarch64" ; then
+    AC_MSG_RESULT([yes])
+  else
+    DISABLED_JVM_FEATURES="$DISABLED_JVM_FEATURES shenandoahgc"
+    AC_MSG_RESULT([no, platform not supported])
+  fi
+
   # Only enable ZGC on supported platforms
   AC_MSG_CHECKING([if zgc can be built])
   if test "x$OPENJDK_TARGET_OS" = "xlinux" && test "x$OPENJDK_TARGET_CPU" = "xx86_64"; then
@@ -349,7 +358,7 @@
 
   # Disable unsupported GCs for Zero
   if HOTSPOT_CHECK_JVM_VARIANT(zero); then
-    DISABLED_JVM_FEATURES="$DISABLED_JVM_FEATURES epsilongc g1gc zgc"
+    DISABLED_JVM_FEATURES="$DISABLED_JVM_FEATURES epsilongc g1gc shenandoahgc zgc"
   fi
 
   # Turn on additional features based on other parts of configure
@@ -483,7 +492,7 @@
   fi
 
   # All variants but minimal (and custom) get these features
-  NON_MINIMAL_FEATURES="$NON_MINIMAL_FEATURES cmsgc g1gc parallelgc serialgc epsilongc jni-check jvmti management nmt services vm-structs zgc"
+  NON_MINIMAL_FEATURES="$NON_MINIMAL_FEATURES cmsgc g1gc parallelgc serialgc epsilongc shenandoahgc jni-check jvmti management nmt services vm-structs zgc"
 
   AC_MSG_CHECKING([if cds should be enabled])
   if test "x$ENABLE_CDS" = "xtrue"; then