Add RELRO run-make tests

Signed-off-by: Johannes Löthberg <johannes@kyriasis.com>

src/test/run-make/relro-levels/Makefile

@@ -0,0 +1,21 @@
+-include ../tools.mk
+
+# This tests the different -Zrelro-level values, and makes sure that they they work properly.
+
+all:
+ifeq ($(UNAME),Linux)
+	# Ensure that binaries built with the full relro level links them with both
+	# RELRO and BIND_NOW for doing eager symbol resolving.
+	$(RUSTC) -Zrelro-level=full hello.rs
+	readelf -l $(TMPDIR)/hello | grep -q GNU_RELRO
+	readelf -d $(TMPDIR)/hello | grep -q BIND_NOW
+
+	$(RUSTC) -Zrelro-level=partial hello.rs
+	readelf -l $(TMPDIR)/hello | grep -q GNU_RELRO
+
+	# Ensure that we're *not* built with RELRO when setting it to off.  We do
+	# not want to check for BIND_NOW however, as the linker might have that
+	# enabled by default.
+	$(RUSTC) -Zrelro-level=off hello.rs
+	! readelf -l $(TMPDIR)/hello | grep -q GNU_RELRO
+endif

src/test/run-make/relro-levels/hello.rs

@@ -0,0 +1,13 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn main() {
+    println!("Hello, world!");
+}