[llvm-bugs] [Bug 25424] New: A compound literal does not yield an lvalue

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25424

            Bug ID: 25424
           Summary: A compound literal does not yield an lvalue
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: andrey.vul at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Given

template <class A, class B> struct IsSame { static constexpr bool value =
false; constexpr operator bool () const { return false; } };
template <class A> struct IsSame<A,A> { static constexpr bool value = true;
constexpr operator bool () const { return true; } };
static_assert(IsSame<decltype(((const char []){ "string"})), const char (&)
[7]>::value, "cxl1");

the test-case should pass, since C99/11 states in 6.5.2.5p4 that compound
literals return lvalues. Clang preserves the prvalue-ness of the string
literal.

Invocation:
clang++ -std=c++11 aa.cc

Clang version:
gentoo-x64 ~ # clang++ -v
clang version 3.8.0 (6215dbd9a8bf16e34b9b7a0cfda3d17e629a2d8d)
(331a8c8a870f582385e659dc8785c7ba522136f5)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Selected GCC installation: /usr/lib/gcc/x86_64-pc-linux-gnu/5.1.0

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