Merge commit 'upstream/2.20'

[msp430-binutils.git] / gold / testsuite / weak_undef_test.cc

diff --git a/gold/testsuite/weak_undef_test.cc b/gold/testsuite/weak_undef_test.cc
new file mode 100644 (file)
index 0000000..962b6bf
--- /dev/null
+++ b/gold/testsuite/weak_undef_test.cc
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+// 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.
+
+
+#include <cstdio>
+#include "weak_undef.h"
+
+extern int no_such_symbol_ __attribute__ ((weak));
+
+int *p1 = &no_such_symbol_;
+
+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;
+    }
+
+  return status;
+}