[LLVMbugs] [Bug 22249] New: "typedef requires a name" should not always be an error with -pedantic-errors

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Jan 16 04:54:13 PST 2015


            Bug ID: 22249
           Summary: "typedef requires a name" should not always be an
                    error with -pedantic-errors
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: harald at gigawatt.nl
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


  typedef struct S { };

with -pedantic-errors gives

test.cc:1:1: error: typedef requires a name [-Werror,-Wmissing-declarations]
typedef struct S { };
1 error generated.

This should remain a warning. There is no rule in C++ (C++11, anyway) anywhere
disallowing this, and GCC does accept it when compiling with -pedantic-errors.


  typedef struct { };

gives the exact same error message, but clang is right to reject this (as is
GCC). This violates [dcl.dcl]p5: "In such cases, the decl-specifier-seq shall
introduce one or more names into the program, or shall redeclare a name
introduced by a previous declaration" with or without the typedef keyword.

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