Make internal class __wrap_iter constexpr when not using libc++'s debugging mode. Introduce a new macro _LIBCPP_CONSTEXPR_IF_NODEBUG to mark this.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@337019 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__config b/include/__config
index 233c2b3..87ba7e6 100644
--- a/include/__config
+++ b/include/__config
@@ -1023,6 +1023,14 @@
# define _LIBCPP_EXPLICIT_MOVE(x) (x)
#endif
+#ifndef _LIBCPP_CONSTEXPR_IF_NODEBUG
+#if !defined(_LIBCPP_DEBUG) && _LIBCPP_STD_VER >= 14
+#define _LIBCPP_CONSTEXPR_IF_NODEBUG constexpr
+#else
+#define _LIBCPP_CONSTEXPR_IF_NODEBUG
+#endif
+#endif
+
#ifndef _LIBCPP_HAS_NO_ASAN
_LIBCPP_FUNC_VIS extern "C" void __sanitizer_annotate_contiguous_container(
const void *, const void *, const void *, const void *);
