import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

build/unix/elfhack/test-ctors.c

@@ -0,0 +1,17 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "test.c"
+
+/* Recent binutils would put .ctors content into a .init_array section */
+__attribute__((section(".manual_ctors"), used))
+static void (*ctors[])() = { (void (*)())-1, end_test, test, NULL };
+
+__attribute__((section(".init")))
+void _init() {
+    void (**func)() = &ctors[sizeof(ctors) / sizeof(void (*)()) - 1];
+    while (*(--func) != (void (*)())-1) {
+        (*func)();
+    }
+}