[cfe-dev] c++11 and invalid opcode

[Piotr Madaliński]

Hi everybody,

I'm trying to compile this code:

> #include <iostream>
> #include <future>
> #include <string>
> #include <algorithm>
>
> using namespace std;
>
> string flip(string s) {
>     reverse(s.begin(),s.end());
>     return s;
> }
>
> int main()
> {
>         vector<future<string>> v;
>         v.push_back(async([](){ return flip(" olleH");  }));
>         v.push_back(async([](){ return flip("\n!dlroW"); }));
>         for(auto &a : v) {
>                 cout << a.get();
>         }
> }
It runs fine when compiled with gcc with the following comand:
> g++ -std=c++11 -pthread main.cpp -o main
But when I switch to clang:
> clang++ -std=c++11 -pthread main.cpp -o main
It segfaults printing out 'Illegal instruction'

In addition this error ends up in the logs:
> kernel: [ 4646.986707] main[2502] trap invalid opcode ip:409f87 
> sp:7fff7a47c5b0 error:0 in main[400000+1a000]
I'm running clang 3.3 from SVN on Linux x86_64 (ArchLinux).

So what exactly did I mess up?

Regards,
Peter