[LLVMbugs] [Bug 10817] New: getline broken, reads an extra line

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10817

           Summary: getline broken, reads an extra line
           Product: libc++
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
        AssignedTo: hhinnant at apple.com
        ReportedBy: oneill+llvmbugs at cs.hmc.edu
                CC: llvmbugs at cs.uiuc.edu


The following trivial program fails to give the intended results with libc++ —
instead of reading one line from the terminal, it reads two.

#include <iostream>
#include <string>

using namespace std;

int main()
{
    cout << "What is your name: ";
    string name;

    getline(cin, name);
    cout << "Hello " << name << endl;

    return 0;
}

Here it is without libcxx:

% clang++ -o hello hello.cpp
% ./hello
What is your name: Miss Marple     
Hello Miss Marple

... and here it is with libcxx:


% clang++ -stdlib=libc++ -o hello hello.cpp
% ./hello
What is your name: Miss Marple
 ... oh noes, I need to type another line ... you do test this stuff, right?
Hello Miss Marple

Tested with current trunk (138853) and with Xcode 4.1.

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