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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - novtable support"
href="https://llvm.org/bugs/show_bug.cgi?id=26905">26905</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>novtable support
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>adamf88@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16019" name="attach_16019" title="source code">attachment 16019</a> <a href="attachment.cgi?id=16019&action=edit" title="source code">[details]</a></span>
source code
When I tried to use Crypto++ (as static library) with Clang on Windows then I
noticed crash of my application. (without errors during compilation)
The issue was in novtable usage. If I remove novtable then everything works
well.
The example below shows how to reproduce this problem. The names are connected
to class names in Crypto++ where I found the problem.
1. Create static library with class MyClass.h / MyClass.cpp (source also in
Attahcment). Whole program optimization should be disabled.
Source code:
#pragma once
class __declspec(novtable) IteratedHashBase
{
virtual void Init() = 0;
};
class __declspec(novtable) IteratedHashWithStaticTransform : public
IteratedHashBase
{
public:
IteratedHashWithStaticTransform()
{
this->Init();
}
void Init()
{}
};
class MD5 : public IteratedHashWithStaticTransform
{
public:
static void InitState() {}
};
2. Create another .exe application, and link this static library.
Source code:
#include "MyClass.h"
#include <cstdio>
int main()
{
MD5 pY;
int i;
scanf("%d", &i);
}
Finally the program compiles properly.
If I use Visual Studio then everything works well.
If I use clang compiler then the program crashes.
In assembly I can see the problem in execution of this->Init(); statement.
I tested it on the last clang snapshot build r262937 (8 March 2016).</pre>
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