[llvm-bugs] [Bug 52192] New: Sort function behaving incorrectly.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52192

            Bug ID: 52192
           Summary: Sort function behaving incorrectly.
           Product: libc++
           Version: 11.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: edward.vogel at hpe.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Created attachment 25368
  --> https://bugs.llvm.org/attachment.cgi?id=25368&action=edit
This is the test program.

There seems to be an issue with the libc++ sort function.  The attached program 
runs correctly with the default library, but fails with libc++.   The expected
output is 0.

Here is a cut/paste from a cygwin session:

$ clang++ -std=c++11 -o a.out  -w t.cpp

VogelEd at XLB3502Q4E ~
$ ./a.out
got back 0

VogelEd at XLB3502Q4E ~
$ clang++ -std=c++11 -o a.out -stdlib=libc++ -w t.cpp

VogelEd at XLB3502Q4E ~
$ ./a.out
got back 260


Other environments (such as Visual Studio 2019) also emit 0.

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