1 // weak_undef_test.cc -- test handling of weak undefined symbols for gold
3 // Copyright (C) 2008-2017 Free Software Foundation, Inc.
4 // Written by Cary Coutant <ccoutant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
23 // We test that we correctly deal with weak undefined symbols.
24 // We need to make sure that a weak undefined symbol in the main
25 // program is resolved to zero by the linker and that no dynamic
26 // relocation is generated. We also make sure that a weak undefined
27 // symbol in a shared library can resolve to a symbol in the main
30 // This file will be linked with a shared library that does not
31 // define the symbol, so that the symbol remains undefined.
32 // Through the use of LD_LIBRARY_PATH, the program will load
33 // an alternate shared library that does define the symbol,
34 // so that we can detect whether the symbol was left for runtime
37 // Similarly, this file will be linked with a shared library that
38 // does define a different symbol, and loaded with an alternate
39 // shared library that does not define that symbol. We check that
40 // the weak reference remains weak, and that it is resolved to
45 #include "weak_undef.h"
47 extern int no_such_symbol_
__attribute__ ((weak
));
49 extern int link_time_only
__attribute__ ((weak
));
51 int *p1
= &no_such_symbol_
;
53 int *p2
= &link_time_only
;
65 fprintf(stderr
, "FAILED weak undef test 1: %s\n",
66 "bound to wrong library");
72 fprintf(stderr
, "FAILED weak undef test 2: expected %d, got %d\n",
79 fprintf(stderr
, "FAILED weak undef test 3: expected %d, got %d\n",
84 if (&no_such_symbol_
!= NULL
)
86 fprintf(stderr
, "FAILED weak undef test 4: %s\n",
87 "&no_such_symbol_ is not NULL");
93 fprintf(stderr
, "FAILED weak undef test 5: %s\n",
100 fprintf(stderr
, "FAILED weak undef test 6: %s\n",
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