// 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// the weak undefined symbol referenced by the main program.// The main program will be linked with a library that does not// provide this definition, so that the symbol remains undefined.// Through the use of the embedded RPATH, the program will load// this 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;int no_such_symbol_ = 2;extern int v2 __attribute__ ((weak));int *v3 = &v2;intt1(){return no_such_symbol_;}// Test that a weak reference from a shared library to a symbol// defined in the main program does get resolved.intt2(){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.intt3(){return (v3 == NULL) ? -1 : *v3;}