[LLVMbugs] [Bug 9519] New: clang warns about missing prototype when using friend function with inline definition

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9519

           Summary: clang warns about missing prototype when using friend
                    function with inline definition
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: jonathan.sauer at gmx.de
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


The following code, compiled with -Wmissing-prototypes, results in the
incorrect warning "no previous prototype for function 'do_something'":

class WithFriends {
    friend void do_something() { }
};


int main(int, char**)
{
}


Output of clang:

$ /opt/bin/clang -std=c++0x -Wmissing-prototypes clangBugs.cpp  
clangBugs.cpp:2:14: warning: no previous prototype for function 'do_something'
      [-Wmissing-prototypes]
        friend void do_something() { }
                    ^
1 warning generated.


My clang version:

$ /opt/bin/clang --version
clang version 3.0 (trunk 127993)
Target: x86_64-apple-darwin10
Thread model: posix


I believe that this warning is incorrect, since friend functions defined
immediately are implicitely inline, and inline functions (IIRC) do not require
a prototype.

Marking the function explicitely as inline makes the warning disappear.

This change happened between SVN revision 127156 (no warning) and 127993
(warning).

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