Merge commit 'upstream/2.20'

[msp430-binutils.git] / gold / testsuite / weak_undef_file1.cc

diff --git a/gold/testsuite/weak_undef_file1.cc b/gold/testsuite/weak_undef_file1.cc
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+// weak_undef_file1.cc -- test handling of weak undefined symbols for gold
+
+// Copyright 2008 Free Software Foundation, Inc.
+// Written by Cary Coutant <ccoutant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+// We test that we correctly deal with weak undefined symbols.
+// We need to make sure that the symbol is resolved to zero
+// by the linker and that no dynamic relocation is generated.
+
+// This source is used to build a shared library that defines
+// an arbitrary symbol other than the weak undefined symbol
+// referenced by the main program.  The main program will be
+// linked with this library so that the symbol remains undefined.
+// Through the use of the embedded RPATH, the program will load
+// an alternate shared library that does define the symbol,
+// so that we can detect whether the symbol was left for runtime
+// resolution.
+
+
+#include <cstdio>
+
+#include "weak_undef.h"
+
+int is_such_symbol_ = 1;
+
+extern int v2 __attribute__ ((weak));
+
+int *v3 = &v2;
+
+int
+t1()
+{
+  return is_such_symbol_;
+}
+
+// Test that a weak reference from a shared library to a symbol
+// defined in the main program does get resolved.
+
+int
+t2()
+{
+  return (&v2 == NULL) ? -1 : v2;
+}
+
+// Test that a weak reference from a shared library to a symbol
+// defined in the main program does get resolved.
+
+int
+t3()
+{
+  return (v3 == NULL) ? -1 : *v3;
+}