[LLVMbugs] [Bug 19305] New: bogus unused variable warning for C++1y variable templates

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19305

            Bug ID: 19305
           Summary: bogus unused variable warning for C++1y variable
                    templates
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++1y
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kremenek at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

This looks like a bogus -Wunused-const-variable warning:

$ cat test.cpp
#include <iostream>

template<class T>
constexpr const T pi(3.141592654);

int main(int argc, const char * argv[])
{
    std::cout << pi<float> << std::endl;
    return 0;
}


$ clang -std=c++1y c.cpp -Wunused-const-variable -fsyntax-only
test.cpp:4:19: warning: unused variable 'pi' [-Wunused-const-variable]
constexpr const T pi(3.141592654);
                  ^
1 warning generated.

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