[LLVMbugs] [Bug 21428] New: Truncated output of negative int64_t to std::ostream with std::hex

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21428

            Bug ID: 21428
           Summary: Truncated output of negative int64_t to std::ostream
                    with std::hex
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kyle at mayeses.com
                CC: llvmbugs at cs.uiuc.edu, mclow.lists at gmail.com
    Classification: Unclassified

Created attachment 13263
  --> http://llvm.org/bugs/attachment.cgi?id=13263&action=edit
A minimal example of the problem.

When outputting any negative int64_t to a std::ostream after having used the
std::hex format flag, the output has the last digit truncated.

std::cout << std::hex << static_cast<int64_t>(-1) << std::endl;

Expected output: 177777777777777777777
Actual output:   1777777777777777777777

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