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107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
// weak_undef_test.cc -- test handling of weak undefined symbols for gold
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// Copyright 2008 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 a weak undefined symbol in the main
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// program is resolved to zero by the linker and that no dynamic
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// relocation is generated. We also make sure that a weak undefined
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// symbol in a shared library can resolve to a symbol in the main
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// program.
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// This file will be linked with a shared library that does not
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// define the symbol, so that the symbol remains undefined.
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// Through the use of LD_LIBRARY_PATH, 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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// Similarly, this file will be linked with a shared library that
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// does define a different symbol, and loaded with an alternate
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// shared library that does not define that symbol. We check that
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// the weak reference remains weak, and that it is resolved to
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// zero at runtime.
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#include <cstdio>
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#include "weak_undef.h"
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extern int no_such_symbol_ __attribute__ ((weak));
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extern int link_time_only __attribute__ ((weak));
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int *p1 = &no_such_symbol_;
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int *p2 = &link_time_only;
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int v2 = 42;
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int
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main()
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{
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int status = 0;
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int v;
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if ((v = t1()) != 2)
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{
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fprintf(stderr, "FAILED weak undef test 1: %s\n",
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"bound to wrong library");
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status = 1;
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}
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if ((v = t2()) != 42)
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{
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fprintf(stderr, "FAILED weak undef test 2: expected %d, got %d\n",
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42, v);
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status = 1;
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}
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if ((v = t3()) != 42)
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{
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fprintf(stderr, "FAILED weak undef test 3: expected %d, got %d\n",
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42, v);
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status = 1;
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}
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if (&no_such_symbol_ != NULL)
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{
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fprintf(stderr, "FAILED weak undef test 4: %s\n",
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"&no_such_symbol_ is not NULL");
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status = 1;
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}
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if (p1 != NULL)
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{
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fprintf(stderr, "FAILED weak undef test 5: %s\n",
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"p1 is not NULL");
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status = 1;
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}
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if (p2 != NULL)
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{
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fprintf(stderr, "FAILED weak undef test 6: %s\n",
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"p2 is not NULL");
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status = 1;
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}
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return status;
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}
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