[llvm-bugs] [Bug 28467] New: clang accepts illegal C++ code with invalid redeclaration

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28467

            Bug ID: 28467
           Summary: clang accepts illegal C++ code with invalid
                    redeclaration
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The current clang trunk (and all versions at least as early as 3.2) accepts the
following C++ code, which is illegal and rejected by both GCC and MSVC. 


$ clang++ -v
clang version 3.9.0 (trunk 274737)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ clang++ -c small.cpp
$ 
$ g++-6.1 -c small.cpp
small.cpp:1:28: error: ‘void f()’ redeclared as different kind of symbol
 template < int f > void f ();
                            ^
small.cpp:1:12: note: previous declaration ‘int f’
 template < int f > void f ();
            ^~~
$ 


-----------------------------------


template < int f > void f ();

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