[LLVMbugs] [Bug 14550] explicit specialization omits functions that call constexpr strlen

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14550

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #1 from Richard Smith <richard-llvm at metafoo.co.uk> 2012-12-09 00:01:15 CST ---
Fixed in r169689. Here's a clue as to what was going on:

$ CXX="clang++ -Wsystem-headers" ./buildit
[...]
../include/string:644:29: error: constexpr function never produces a constant
      expression [-Winvalid-constexpr]
    static constexpr size_t length(const char_type* __s) {return strlen(__s);}
                            ^
../include/string:644:66: note: subexpression not valid in a constant
expression
    static constexpr size_t length(const char_type* __s) {return strlen(__s);}
                                                                 ^

To support libstdc++, we allow such bogus constexpr function definitions in
system headers. We were accidentally marking the function as invalid in this
case, leading to us not emitting any caller of it.

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