https://llvm.org/bugs/show_bug.cgi?id=26905
Bug ID: 26905
Summary: novtable support
Product: new-bugs
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: adam...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16019
--> https://llvm.org/bugs/attachment.cgi?id=16019&action=edit
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).
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