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76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
// weak_undef_file1.cc -- test handling of weak undefined symbols for gold
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// Copyright (C) 2008-2019 Free Software Foundation, Inc.
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// Written by Cary Coutant <ccoutant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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// We test that we correctly deal with weak undefined symbols.
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// We need to make sure that the symbol is resolved to zero
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// by the linker and that no dynamic relocation is generated.
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// This source is used to build a shared library that defines
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// an arbitrary symbol other than the weak undefined symbol
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// referenced by the main program. The main program will be
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// linked with this library so that the symbol remains undefined.
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// Through the use of the embedded RPATH, the program will load
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// an alternate shared library that does define the symbol,
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// so that we can detect whether the symbol was left for runtime
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// resolution.
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#include <cstdio>
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#include "weak_undef.h"
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int is_such_symbol_ = 1;
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// We also define a symbol that is not defined by the alternate
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// library. The main program contains a weak reference to this
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// symbol, and tests that the reference remains weak even after
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// the definition was found at link time.
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int link_time_only = 1;
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extern int v2 __attribute__ ((weak));
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int *v3 = &v2;
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int
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t1()
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{
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return is_such_symbol_;
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}
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// Test that a weak reference from a shared library to a symbol
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// defined in the main program does get resolved.
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int
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t2()
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{
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return (&v2 == NULL) ? -1 : v2;
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}
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// Test that a weak reference from a shared library to a symbol
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// defined in the main program does get resolved.
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int
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t3()
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{
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return (v3 == NULL) ? -1 : *v3;
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}
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