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65eb8c79be
This patch adds option --weak-unresolved-symbols to treat unresolved symbols as weak references. This is helpful when we want the link to succeed with unresolved symbols and the dynamic loader to not complain at run-time. Option --warn-unresolved-symbols lets the link succeed but could fail at run-time with unresolved symbol warnings especially when the unresolved symbols have GOT entries and dynamic relocations against them, like when -fPIE is used. 2015-04-23 Sriraman Tallam <tmsriram@google.com> * options.h (--weak-unresolved-symbols): New option. * symtab.cc (Symbol_table::sized_write_globals): Change symbol binding to weak with new option. * symtab.h (is_weak_undefined): Check for new option. (is_strong_undefined): Check for new option. * testsuite/Makefile.am (weak_unresolved_symbols_test): New test. * testsuite/Makefile.in: Regenerate. * testsuite/weak_unresolved_symbols_test.cc: New file.
46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
// weak_unresolved_symbols_test.cc -- a test case for gold
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// Copyright (C) 2015 Free Software Foundation, Inc.
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// Written by Sriraman Tallam <tmsriram@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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// Test --weak-unresolved-symbols. Symbol foo remains unresolved but
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// with -fPIE, needs a GOT entry and has a dynsym entry and a dynamic
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// relocation against it created. This will fail to link and run without
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// --weak-unresolved-symbols. With --warn-unresolved-symbols, it will link
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// but the dynamic linker will complain that foo(_Z3foov) is unresolved.
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extern int foo();
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int bar() {
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return 0;
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}
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int (*p)() = &bar;
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int main() {
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if (p == &foo)
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{
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foo();
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}
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else
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(*p)();
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return 0;
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}
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