[cfe-dev] g++ 4.2.8 vs libc++ - bug?

[Marco Wisse via cfe-dev]

Hi,

I hope I found the right place for this question. I was trying something
very basic, i.e. to read a double followed by a character, from cin, and
noticed that there is a difference between the way this works using g++
4.2.8 on linux and the way it does (not work) using libc++ on a mac with
the latest version of xcode.

The entire code has only a few lines:

------------------------------------------------
#include<iostream>
using namespace std;

int main() {
    char c;
    float d;
    while(cin >> d >> c) cout << d << c <<  endl;
}
------------------------------------------------

When I compile this on linux using g++ 4.2.8, typing "2a", for example,
produces "2a", and so on, as required.

However, compiling this on the mac with Apple LLVM version 7.0.0
(clang-700.0.72), using
"clang++ -stdlib=libc++ --std=c++11 test.cpp", "2a", "2b", and quite a few
more, fail.

It seems strange to me that such a basic operation can produce different
results. Do you have any thoughts?

Kind regards,
Marco
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