diff options
Diffstat (limited to 'binutils-2.25/gold/testsuite/weak_undef_test.cc')
-rw-r--r-- | binutils-2.25/gold/testsuite/weak_undef_test.cc | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/binutils-2.25/gold/testsuite/weak_undef_test.cc b/binutils-2.25/gold/testsuite/weak_undef_test.cc new file mode 100644 index 00000000..880d5cdc --- /dev/null +++ b/binutils-2.25/gold/testsuite/weak_undef_test.cc @@ -0,0 +1,106 @@ +// weak_undef_test.cc -- test handling of weak undefined symbols for gold + +// Copyright 2008 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 a weak undefined symbol in the main +// program is resolved to zero by the linker and that no dynamic +// relocation is generated. We also make sure that a weak undefined +// symbol in a shared library can resolve to a symbol in the main +// program. + +// This file will be linked with a shared library that does not +// define the symbol, so that the symbol remains undefined. +// Through the use of LD_LIBRARY_PATH, 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. + +// Similarly, this file will be linked with a shared library that +// does define a different symbol, and loaded with an alternate +// shared library that does not define that symbol. We check that +// the weak reference remains weak, and that it is resolved to +// zero at runtime. + + +#include <cstdio> +#include "weak_undef.h" + +extern int no_such_symbol_ __attribute__ ((weak)); + +extern int link_time_only __attribute__ ((weak)); + +int *p1 = &no_such_symbol_; + +int *p2 = &link_time_only; + +int v2 = 42; + +int +main() +{ + int status = 0; + int v; + + if ((v = t1()) != 2) + { + fprintf(stderr, "FAILED weak undef test 1: %s\n", + "bound to wrong library"); + status = 1; + } + + if ((v = t2()) != 42) + { + fprintf(stderr, "FAILED weak undef test 2: expected %d, got %d\n", + 42, v); + status = 1; + } + + if ((v = t3()) != 42) + { + fprintf(stderr, "FAILED weak undef test 3: expected %d, got %d\n", + 42, v); + status = 1; + } + + if (&no_such_symbol_ != NULL) + { + fprintf(stderr, "FAILED weak undef test 4: %s\n", + "&no_such_symbol_ is not NULL"); + status = 1; + } + + if (p1 != NULL) + { + fprintf(stderr, "FAILED weak undef test 5: %s\n", + "p1 is not NULL"); + status = 1; + } + + if (p2 != NULL) + { + fprintf(stderr, "FAILED weak undef test 6: %s\n", + "p2 is not NULL"); + status = 1; + } + + return status; +} |