[LLVMbugs] [Bug 15481] New: noexcept should check whether the expression is a constant expression

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15481

            Bug ID: 15481
           Summary: noexcept should check whether the expression is a
                    constant expression
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Quoth the book of C++, [expr.unary.noexcept]p3:

"The result of the noexcept operator is false if in a potentially-evaluated
context the expression would contain a potentially-evaluated call to a
function, member function, function pointer, or member function pointer that
does not have a non-throwing exception-specification (15.4), *unless the call
is a constant
expression (5.19)*". We do not implement that last phrase:

<stdin>:1:33: error: static_assert failed ""
constexpr int f() { return 0; } static_assert(noexcept(f()), "");
                                ^             ~~~~~~~~~~~~~

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