[cfe-dev] Odd clang result using stringstream formatted input

[Edward Diener via cfe-dev]

On 10/31/2016 1:05 PM, Reid Kleckner via cfe-dev wrote:
> Seems like a mingw-ish bug. This program works as expected in an MSVC
> environment. I don't have a 32-bit mingw installation to reproduce your
> configuration.

It's my error. The std::ios_base::failure exception is derived from 
std::runtime_error only for c++11. In VC++ c++11 mode is automaically on 
whereas in clang the default is c++03 mode.

>
> On Thu, Oct 27, 2016 at 2:41 AM, Edward Diener via cfe-dev
> <cfe-dev at lists.llvm.org
> <mailto:cfe-dev at lists.llvm.org>> wrote:
>
>     The following program:
>
>     #include <iostream>
>     #include <sstream>
>     #include <stdexcept>
>     int main()
>         {
>
>         std::stringstream ss;
>         ss.exceptions(std::ios_base::failbit | std::ios_base::badbit);
>         char c;
>
>         try
>             {
>             ss >> c;
>             std::cout << "Exception not thrown.";
>             }
>         catch (std::runtime_error &)
>             {
>             std::cout << "Exception std::runtime_error thrown.";
>             }
>         catch (...)
>             {
>             std::cout << "Unknown exception thrown.";
>             }
>         }
>
>     outputs "Unknown exception thrown." when compiled and linked with
>     the latest clang built from source on Windows 7. The compilation
>     options are:
>
>     -c -x c++ -Wno-unused-local-typedef
>     -Wno-dll-attribute-on-redeclaration -O0 -g -fno-inline -Wall -g
>     -march=i686 -m32 -o
>
>     The linker options are:
>
>     -Wl,-Bstatic  -Wl,-Bdynamic  -Wl,--end-group -g -march=i686 -m32
>
>     I would have expected the output to be "Exception std::runtime_error
>     thrown." as it is when compiled with VC++ 14.
>
>     Is clang following the C++ standard or is this a bug in clang ?