[LLVMbugs] [Bug 12008] New: Confusing error message with declared constexpr member functions

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12008

             Bug #: 12008
           Summary: Confusing error message with declared constexpr member
                    functions
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++0x
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: marc.mutz at kdab.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8053
  --> http://llvm.org/bugs/attachment.cgi?id=8053
Test program (as pasted in the report)

Code:

  class Point {
    constexpr Point( int x, int y )
        : x( x ), y( y ) {}
  public:
    static constexpr Point fromXY( int x, int y );
  private:
    int x, y;
  };

  constexpr Point Point::fromXY( int x, int y )
  { return Point( x, y ); }

GCC groks this, but Clang (probably correctly) rejects it, but with a confusing
error message:

  test.cpp:11:24: error: conflicting types for 'fromXY'
  constexpr Point Point::fromXY( int x, int y )
                       ^
  test.cpp:5:28: note: previous declaration is here
      static constexpr Point fromXY( int x, int y );
                           ^
  1 error generated.

A better error message would be "constexpr functions must be defined where
first declared", assuming that's what the above error message tried to tell me.

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