Add the --disable-thp option to support cross compiling.

This resolves #669.

include/jemalloc/internal/jemalloc_internal_defs.h.in

@@ -269,8 +269,8 @@
 #undef JEMALLOC_PURGE_MADVISE_DONTNEED_ZEROS
 
 /*
- * Defined if transparent huge pages are supported via the MADV_[NO]HUGEPAGE
- * arguments to madvise(2).
+ * Defined if transparent huge pages (THPs) are supported via the
+ * MADV_[NO]HUGEPAGE arguments to madvise(2), and THP support is enabled.
  */
 #undef JEMALLOC_THP
 

include/jemalloc/internal/jemalloc_preamble.h.in

@@ -111,6 +111,13 @@ static const bool config_stats =
     false
 #endif
     ;
+static const bool config_thp =
+#ifdef JEMALLOC_THP
+    true
+#else
+    false
+#endif
+    ;
 static const bool config_tls =
 #ifdef JEMALLOC_TLS
     true
@@ -139,13 +146,6 @@ static const bool config_cache_oblivious =
     false
 #endif
     ;
-static const bool have_thp =
-#ifdef JEMALLOC_THP
-    true
-#else
-    false
-#endif
-    ;
 #ifdef JEMALLOC_HAVE_SCHED_GETCPU
 /* Currently percpu_arena depends on sched_getcpu. */
 #define JEMALLOC_PERCPU_ARENA