[LLVMbugs] [Bug 12770] New: declaration conflicts for extern "C" function

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12770

             Bug #: 12770
           Summary: declaration conflicts for extern "C" function
           Product: new-bugs
           Version: 3.0
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sbn at tbricks.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


The following code is accepted by g++ (4.2.1 on MacOSX, 4.5.1, 4.7.0 on
Solaris, 4.1.2, 3.4.6, 4.4.4 on Linux) and Sun C++ 5.11 on Solaris, but
rejected by clang (3.0 on MacOSX and TOT on Solaris):

$ cat -n b.cpp
     1  extern "C" {
     2  
     3  namespace std {
     4  int rename(const char *, const char *);
     5  }
     6  
     7  }
     8  
     9  using std::rename;
    10  
    11  extern "C" int rename(const char *, const char *);
$ clang++ -c b.cpp
b.cpp:11:16: error: declaration conflicts with target of using declaration
already in scope
extern "C" int rename(const char *, const char *);
               ^
b.cpp:4:5: note: target of using declaration
int rename(const char *, const char *);
    ^
b.cpp:9:12: note: using declaration
using std::rename;
           ^
1 error generated.
$ clang++ -v
Apple clang version 3.0 (tags/Apple/clang-211.10.1) (based on LLVM 3.0svn)
Target: x86_64-apple-darwin11.2.0
Thread model: posix

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