clang/test/CXX/basic/basic.def.odr/p1-var.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 // C++ [basic.def.odr]p1:
   4 //   No translation unit shall contain more than one definition of any
   5 //   variable, [...].
   6
   7 // Bad: in C++, these are both definitions. None of that C99 tentative stuff.
   8 int i; // expected-note {{previous}}
   9 int i; // expected-error {{redefinition}}
  10
  11 // OK: decl + def
  12 extern int j;
  13 int j;
  14
  15 // OK: def + decl
  16 int k;
  17 extern int k;
  18
  19 // Bad. The important thing here is that we don't emit the diagnostic twice.
  20 int l = 1; // expected-note {{previous}}
  21 int l = 2; // expected-error {{redefinition}}