[llvm-bugs] [Bug 42516] New: "duplicate symbol" when using "-fprofile-instr-generate" and "using namespace std; " is used in two .cpp files

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42516

            Bug ID: 42516
           Summary: "duplicate symbol" when using
                    "-fprofile-instr-generate" and "using namespace std;"
                    is used in two .cpp files
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: alorbach at adiscon.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

So I am trying to do coverage with -fprofile-instr-generate and
-fcoverage-mapping on Windows with clang-8 (confirmed that devel clang 9 has
the same problem).

So if have a library porject that have two .cpp files in your project which use
this on top: 

using namespace std;

Once the compiled library is linked, you will get this error: 

Error           duplicate symbol: __profn_??_G_Facet_base at std@@UEAAPEAXI at Z in
project.lib(code1.obj) and in project.lib(code2.obj)

I could nail the problem down the namespace std, if you remove it from one if
the code files it will link.

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