From af34cc859ae9979e9f4f8abf29646efd6b1c9c04 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Tue, 17 Feb 2015 19:21:06 +0100
Subject: erts: Add ERTS_UNDEF macro

---
 erts/emulator/beam/sys.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'erts/emulator')

diff --git a/erts/emulator/beam/sys.h b/erts/emulator/beam/sys.h
index 828f5b427a..d2a8b9e7f4 100644
--- a/erts/emulator/beam/sys.h
+++ b/erts/emulator/beam/sys.h
@@ -188,6 +188,16 @@ __decl_noreturn void __noreturn erl_assert_error(const char* expr, const char *f
 #  define ASSERT(e) ((void) 1)
 #endif
 
+/* ERTS_UNDEF can be used to silence false warnings about
+ * "variable may be used uninitialized" while keeping the variable
+ * marked as undefined by valgrind.
+ */
+#ifdef VALGRIND
+#  define ERTS_UNDEF(V,I)
+#else
+#  define ERTS_UNDEF(V,I) V = I
+#endif
+
 /*
  * Compile time assert
  * (the actual compiler error msg can be a bit confusing)
-- 
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