[LLVMbugs] [Bug 17604] New: stringstream::width() leads to garbage fill characters

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17604

            Bug ID: 17604
           Summary: stringstream::width() leads to garbage fill characters
           Product: libc++
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: hhinnant at apple.com
          Reporter: mcmccarty at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11383
  --> http://llvm.org/bugs/attachment.cgi?id=11383&action=edit
example source code

% clang++ -v
Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix

% clang++ -std=c++11 -stdlib=libc++ stringstream_bug.cpp && ./a.out
'ÿÿÿ123'

See attached source code.  Removing the '-stdlib=libc++' parameter generates
the correct output:

% clang++ -std=c++11 f.cpp && ./a.out
'   123'

Adding an explicit call to sstrm.fill(' ') also works around the problem.

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