[llvm-bugs] [Bug 24408] New: [mingw64] unordered_map throws segv from libstdc++-6.dll when app is compiled with Clang 3.6.2

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24408

            Bug ID: 24408
           Summary: [mingw64] unordered_map throws segv from
                    libstdc++-6.dll when app is compiled with Clang 3.6.2
           Product: clang
           Version: 3.6
          Hardware: PC
                OS: other
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: iamvfx at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Repro code:

```
#include <unordered_map>
#include <string>

int main()
{
  std::unordered_map<std::string, int> test;
  test["cool"] = 5;
}
```

Used commands to compile and run executable:

```
clang++ -std=c++11 main.cpp
a.exe
```

Backtrace:

```
Program received signal SIGSEGV, Segmentation fault.
0x000000006fc9a07b in ?? () from C:\msys64\mingw64\bin\libstdc++-6.dll
(gdb) bt
#0  0x000000006fc9a07b in ?? () from C:\msys64\mingw64\bin\libstdc++-6.dll
#1  0x00000000004019c6 in _M_insert_unique_node ()
    at C:\msys64\mingw64\bin/../include/c++/5.2.0\bits/hashtable.h:1594
#2  0x0000000000401962 in operator[] ()
    at C:\msys64\mingw64\bin/../include/c++/5.2.0\bits/hashtable_policy.h:625
#3  0x0000000000401622 in operator[] ()
    at C:\msys64\mingw64\bin/../include/c++/5.2.0\bits/unordered_map.h:672
#4  main () at ../src\main.cpp:7
```

Clang version:

```
clang version 3.6.2 (tags/RELEASE_362/final)
Target: x86_64-w64-windows-gnu
Thread model: posix
```

Clang and GCC were installed from MSYS2.

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