Report inconsistent configuration if PARALLEL_MARK but no THREADS

* include/private/gcconfig.h (PARALLEL_MARK): Add an explicit check
for THREADS to be defined if PARALLEL_MARK is defined.

diff --git a/include/private/gcconfig.h b/include/private/gcconfig.h
index 9bb29e3b5c27383746e89296ee0eac85f69798c3..1a6436c621c8607cfc3ade527e797a42eb128bfc 100644 (file)
--- a/include/private/gcconfig.h
+++ b/include/private/gcconfig.h
@@ -2583,6 +2583,10 @@
 # define THREADS
 #endif
 
+#if defined(PARALLEL_MARK) && !defined(THREADS)
+# error "invalid config - PARALLEL_MARK requires GC_THREADS"
+#endif
+
 #if defined(UNIX_LIKE) && defined(THREADS) && !defined(NO_CANCEL_SAFE) \
     && !defined(PLATFORM_ANDROID)
   /* Make the code cancellation-safe.  This basically means that we     */