[LLVMbugs] [Bug 23647] New: auto p = std::make_shared<volatile T>() does not compile

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23647

            Bug ID: 23647
           Summary: auto p = std::make_shared<volatile T>() does not
                    compile
           Product: libc++
           Version: 3.6
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: yegor.derevenets at gmail.com
                CC: llvmbugs at cs.uiuc.edu, mclow.lists at gmail.com
    Classification: Unclassified

Hi,

the following program fails to compile with Clang 3.5, 3.6 and libc++ 3.5, 3.6,
although IMHO it should:


#include <memory>

int main() {
    auto p = std::make_shared<volatile bool>(false);
}


$ clang++-3.6 -std=c++11 -stdlib=libc++ make_volatile_something.cpp 
In file included from make_volatile_something.cpp:1:
/usr/include/c++/v1/memory:4284:9: error: no matching member function for call
to '__enable_weak_this'
    __r.__enable_weak_this(__r.__ptr_);
    ~~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/v1/memory:4644:29: note: in instantiation of function template
specialization 'std::__1::shared_ptr<volatile
      bool>::make_shared<bool>' requested here
    return shared_ptr<_Tp>::make_shared(_VSTD::forward<_Args>(__args)...);
                            ^
make_volatile_something.cpp:4:16: note: in instantiation of function template
specialization 'std::__1::make_shared<volatile bool, bool>'
      requested here
        auto p = std::make_shared<volatile bool>(false);
                      ^
/usr/include/c++/v1/memory:4008:10: note: candidate function not viable: no
known conversion from 'element_type *' (aka 'volatile bool *') to
      'const void *' for 1st argument; take the address of the argument with &
    void __enable_weak_this(const void*) _NOEXCEPT {}
         ^
/usr/include/c++/v1/memory:4001:9: note: candidate template ignored: could not
match 'enable_shared_from_this<type-parameter-0-0>' against
      'volatile bool'
        __enable_weak_this(const enable_shared_from_this<_Yp>* __e) _NOEXCEPT
        ^
1 error generated.

The above program compiles fine with GCC 4.9 and its libstdc++.

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