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// justsyms_1.cc -- test --just-symbols for gold

// Copyright 2008 Free Software Foundation, Inc.

// Written by Ian Lance Taylor <iant@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.

// The Linux kernel builds an object file using a linker script, and

// then links against that object file using the -R option.  This is a

// test for that usage.

#include <cassert>

#include <csignal>

#include <cstddef>

#include <cstdlib>

#include <stdint.h>

extern char justsyms_string[];

// We expect to get a SIGSEGV.

static void

handle_sigsegv(int)

{

  exit(0);

}

int

main(int, char**)

{

  // The linker script should arrange for this symbol to be exactly at

  // address 0x10000.

  assert(reinterpret_cast<uintptr_t>(justsyms_string) == 0x100);

  // However, since the file was linked with --just-symbols, we should

  // not be able to actually access the symbol.

  signal(SIGSEGV, handle_sigsegv);

  char c = justsyms_string[0];

  exit(c == '\0' ? 1 : c);

}