[llvm-bugs] [Bug 40430] New: constexpr evaluation fails with string init

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Jan 23 16:51:20 PST 2019


            Bug ID: 40430
           Summary: constexpr evaluation fails with string init
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: efriedma at codeaurora.org
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

struct S {
  char c[10] = "asdf";
  constexpr char foo() { return c[3]; }
static_assert(S().foo() == 'f', "");

<stdin>:5:15: error: static_assert expression is not an integral constant
static_assert(S().foo() == 'f', "");
<stdin>:2:16: note: subexpression not valid in a constant expression
  char c[10] = "asdf";
<stdin>:5:15: note: in call to 'S()'
static_assert(S().foo() == 'f', "");
1 error generated.

Synthetic testcase I came up with looking at the array vs. lvalue confusion in
constant evaluation.

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