diff options
Diffstat (limited to 'binutils-2.25/gold/testsuite/weak_undef_file1.cc')
-rw-r--r-- | binutils-2.25/gold/testsuite/weak_undef_file1.cc | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/binutils-2.25/gold/testsuite/weak_undef_file1.cc b/binutils-2.25/gold/testsuite/weak_undef_file1.cc new file mode 100644 index 00000000..fd288704 --- /dev/null +++ b/binutils-2.25/gold/testsuite/weak_undef_file1.cc @@ -0,0 +1,75 @@ +// weak_undef_file1.cc -- test handling of weak undefined symbols for gold + +// Copyright 2008, 2010 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 +// an arbitrary symbol other than the weak undefined symbol +// referenced by the main program. The main program will be +// linked with this library so that the symbol remains undefined. +// Through the use of the embedded RPATH, the program will load +// an 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; + +// We also define a symbol that is not defined by the alternate +// library. The main program contains a weak reference to this +// symbol, and tests that the reference remains weak even after +// the definition was found at link time. + +int link_time_only = 1; + +extern int v2 __attribute__ ((weak)); + +int *v3 = &v2; + +int +t1() +{ + return is_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; +} |