[LLVMbugs] [Bug 10168] New: -Wunused gives multiple errors for unused variable in template

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10168

           Summary: -Wunused gives multiple errors for unused variable in
                    template
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: richard-llvm at metafoo.co.uk
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


template<typename T>
struct S {
  void f() {
    int a;
  }
};

int main() {
  S<int>().f();
  S<double>().f();
}


tmp.cpp:4:9: warning: unused variable 'a' [-Wunused-variable]
    int a;
        ^
tmp.cpp:4:9: warning: unused variable 'a' [-Wunused-variable]                   
tmp.cpp:9:12: note: in instantiation of member function 'S<int>::f' requested
here
  S<int>().f();
           ^
tmp.cpp:4:9: warning: unused variable 'a' [-Wunused-variable]                   
    int a;
        ^
tmp.cpp:10:15: note: in instantiation of member function 'S<double>::f'
requested here     
  S<double>().f();
              ^

One warning is produced for the template definition, and one more is produced
for each instantiation. Strangely, we don't get the first warning for a
dependently-typed unused variable.

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