projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 86925eef CC |
1 | // weak_undef_file1.cc -- test handling of weak undefined symbols for gold |
| 2 | ||
| 3 | // Copyright 2008 Free Software Foundation, Inc. | |
| 4 | // Written by Cary Coutant <ccoutant@google.com>. | |
| 5 | ||
| 6 | // This file is part of gold. | |
| 7 | ||
| 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. | |
| 12 | ||
| 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. | |
| 17 | ||
| 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. | |
| 22 | ||
| 23 | // We test that we correctly deal with weak undefined symbols. | |
| 24 | // We need to make sure that the symbol is resolved to zero | |
| 25 | // by the linker and that no dynamic relocation is generated. | |
| 26 | ||
| 27 | // This source is used to build a shared library that defines | |
| 28 | // an arbitrary symbol other than the weak undefined symbol | |
| 29 | // referenced by the main program. The main program will be | |
| 30 | // linked with this library so that the symbol remains undefined. | |
| 31 | // Through the use of the embedded RPATH, the program will load | |
| 32 | // an alternate shared library that does define the symbol, | |
| 33 | // so that we can detect whether the symbol was left for runtime | |
| 34 | // resolution. | |
| 35 | ||
| 36 | ||
| 37 | #include <cstdio> | |
| 38 | ||
| f3c69fca CC |
39 | #include "weak_undef.h" |
| 40 | ||
| 41 | int is_such_symbol_ = 1; | |
| 42 | ||
| 43 | extern int v2 __attribute__ ((weak)); | |
| 44 | ||
| 45 | int *v3 = &v2; | |
| 86925eef CC |
46 | |
| 47 | int | |
| 48 | t1() | |
| 49 | { | |
| 50 | return is_such_symbol_; | |
| 51 | } | |
| f3c69fca CC |
52 | |
| 53 | // Test that a weak reference from a shared library to a symbol | |
| 54 | // defined in the main program does get resolved. | |
| 55 | ||
| 56 | int | |
| 57 | t2() | |
| 58 | { | |
| 59 | return (&v2 == NULL) ? -1 : v2; | |
| 60 | } | |
| 61 | ||
| 62 | // Test that a weak reference from a shared library to a symbol | |
| 63 | // defined in the main program does get resolved. | |
| 64 | ||
| 65 | int | |
| 66 | t3() | |
| 67 | { | |
| 68 | return (v3 == NULL) ? -1 : *v3; | |
| 69 | } |