<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Fundamental typeinfo should have weak linkage by default"
href="https://bugs.llvm.org/show_bug.cgi?id=38281">38281</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Fundamental typeinfo should have weak linkage by default
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>thomasanderson@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Compiling the below test.cpp with g++ and clang++ gives different results:
clang generates the fundamental typeinfo with strong linkage, but g++ uses weak
linkage. Clang should switch to using weak linkage to match the gcc behavior.
thomasanderson@thomasanderson:~/test$ cat test.cpp
#include <typeinfo>
namespace __cxxabiv1 {
class __fundamental_type_info : public std::type_info {
public:
virtual ~__fundamental_type_info();
};
__fundamental_type_info::~__fundamental_type_info() {}
}
thomasanderson@thomasanderson:~/test$ g++ test.cpp -c -o main.o
thomasanderson@thomasanderson:~/test$ nm main.o
...
0000000000000000 V _ZTIa
0000000000000000 V _ZTIb
0000000000000000 V _ZTIc
...
thomasanderson@thomasanderson:~/test$ clang++ test.cpp -c -o main.o
thomasanderson@thomasanderson:~/test$ nm main.o
...
0000000000000338 R _ZTIa
0000000000000178 R _ZTIb
0000000000000258 R _ZTIc
...</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>