[lldb-dev] Using LLDB API Segment Fault

[Song Ziming]

Hi everyone, I want to build a debugger frontend making use of LLDB's 
API (on ubuntu linux 64bit). Since there's not enough document/tutorial 
on using LLDB API, I turned to the "Python reference" and made a little 
program:

```
#include <iostream>
#include <lldb/API/LLDB.h>
#include <lldb/API/SBDebugger.h>
#include <lldb/API/SBTarget.h>
using namespace std;
using namespace lldb;

int main() {
     cout << "Hello LLDB!" << endl;
     SBDebugger debugger = SBDebugger::Create();
     debugger.SetAsync(false);
     SBTarget target = 
debugger.CreateTargetWithFileAndArch("/home/szm/target", LLDB_ARCH_DEFAULT);
     return 0;
}
```

I compile and link the program using command: g++ -std=c++0x -o 
lldbwrapper lldbwrapper.cpp -I /usr/lib/llvm-3.5/include -llldb. It 
compiled without error, but when I run the program it printed "Helo, 
LLDB!" and then printed "Segment fault".

What's more, if I use the same code in Qt Creator with a plain c++ 
project (using qmake, with C++11 enabled), the program just run normally.

I inspected Qt's compile command is:

```
g++ -c -pipe -g -std=c++0x -Wall -W -fPIE 
-I/opt/Qt5.3.1/5.3/gcc_64/mkspecs/linux-g++ -I../lldbtest 
-I/usr/lib/llvm-3.5/include -I. -o main.o ../lldbtest/main.cpp
g++ -Wl,-rpath,/opt/Qt5.3.1/5.3/gcc_64 -o lldbtest main.o -I 
/usr/lib/llvm-3.5/include -llldb
```
But I didnt see any difference, what's the cause of the segment fault 
only in command line?

Thanks,

Song Ziming
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