[LLVMbugs] [Bug 7517] New: behavior differs from g++'s if 'using namespace XXX', where XXX was never defined

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7517

           Summary: behavior differs from g++'s if 'using namespace XXX',
                    where XXX was never defined
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: gryzman at gmail.com
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


attached is a bit of code, that would compile in g++, but fails in clang++. 
Now I can kind of understand why it fails on clang++, nonetheless, you guys
want full compatibility with g++, so here's a bit of help. 

I am basically trying to compile libpqxx (not a great library, but good
exercise in c++ nonetheless). and this pops out from ./configure script;

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