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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Segfault istream.tellg() and unordered_map"
href="http://llvm.org/bugs/show_bug.cgi?id=21460">21460</a>
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<th>Summary</th>
<td>Segfault istream.tellg() and unordered_map
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.5
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>release blocker
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mail@tylor.io
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I get a segfault when calling tellg() on any istream.
#include <string>
#include <sstream>
int main() {
std::string str = "Hello, world";
std::istringstream in(str);
std::string word;
in >> word;
int pos = in.tellg();
}
I also get a segfault when trying to insert an element into a unordered_map
#include <unordered_map>
int main() {
std::unordered_map<int, int> int_map;
int_map[2] = 3;
}
When I run this through gdb I get this:
Program received signal SIGSEGV, Segmentation fault.
0x000000006fc8cac8 in ?? () from c:\msys64\mingw64\bin\libstdc++-6.dll
I running this on Windows 7 using the mingw64 package via msys2
I don't get this behavior with g++ 4.9.1 or in the mingw32 package of the same
version.
$ clang++ --version
clang version 3.5.0 (tags/RELEASE_350/final)
Target: x86_64-w64-windows-gnu
Thread model: posix
$ uname -a
MINGW64_NT-6.1 tower 2.0.0(0.279/5/3) 2014-10-27 06:58 x86_64 Msys</pre>
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