mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
f3c69fcab1
(Symbol::needs_plt_entry): Allow weak undefined symbols. (Symbol::needs_dynamic_reloc): Allow weak undefined symbols when building shared libraries. * testsuite/Makefile.am (weak_undef_nonpic_test): New target. (weak_undef_file1_nonpic.o, weak_undef_file2_nonpic.o) (weak_undef_lib_nonpic.so, alt/weak_undef_lib_nonpic.so): New targets. * testsuite/Makefile.in: Rebuild. * testsuite/weak_undef.h: New file. * testsuite/weak_undef_file1.cc: Add extra test cases. * testsuite/weak_undef_file2.cc: Likewise. * testsuite/weak_undef_test.cc: Likewise.
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
// 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;
|
|
|
|
int
|
|
t1()
|
|
{
|
|
return no_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;
|
|
}
|