[llvm-bugs] [Bug 28422] New: enum return value on friend function spacified as from global namespace ignores whitespace

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28422

            Bug ID: 28422
           Summary: enum return value on friend function spacified as from
                    global namespace ignores whitespace
           Product: clang
           Version: 3.7
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: gw.fossdev at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16687
  --> https://llvm.org/bugs/attachment.cgi?id=16687&action=edit
test case

Dear all, 

I've came across a wired problem when declaring a function as friend when it is
specified to be in the global namespace and has an enum as return value (see
attached test case). 

  When I compile the example with -std=c++11 I get the error 

whitespace_eating.cc:8:20: error: C++ requires a type specifier for all
declarations
      friend enu ::wow();

   compiling with std=c++03 gives 

whitespace_eating.cc:8:14: warning: use of enumeration in a nested name
specifier is a C++11 extension [-Wc++11-extensions]
      friend enu ::wow();
             ^
whitespace_eating.cc:8:20: error: C++ requires a type specifier for all
declarations
      friend enu ::wow();

  Given these error messages I can only assume that the parser discards the
whitespace between "enu" and "::wow". 

Removing the global namespace specifier "::" before "wow" also results in
compilation errors because now the friend declaration of wow() is assumed to
reside in the "fun" namespace (as it should be) - i.e. this is no workaround. 

I've seen the same problem with version 3.9.0-svn274438-1 and  3.7.1
(tags/RELEASE_371/final). 

I've also reported a similar bug against g++-6 in the Debian bug tracker [1],
but g++ accepts the construct in c++03 mode. 

I've also tested this with "enu" being a struct with similar results, i.e. the
white space between the return type and :: is ignored.

If "enu" is replaced by "int" then the code compiles fine. 

Any insight is highly appreciated. 

Many thanks, 
Gert 

[1] https://bugs.debian.org/829604

PS: the original code that made me encounter the problem is some third party
project that uses bison to create some of the code and also the enums.

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