@@ -882,6 +882,7 @@ c_cpp_builtins (cpp_reader *pfile)
cpp_define (pfile, "__cpp_nontype_template_args=201411");
cpp_define (pfile, "__cpp_range_based_for=201603");
cpp_define (pfile, "__cpp_constexpr=201603");
+ cpp_define (pfile, "__cpp_if_constexpr=201606");
}
if (flag_concepts)
/* Use a value smaller than the 201507 specified in
@@ -344,6 +344,12 @@
# error "__cpp_hex_float != 201603"
#endif
+#ifndef __cpp_if_constexpr
+# error "__cpp_if_constexpr"
+#elif __cpp_if_constexpr != 201606
+# error "__cpp_if_constexpr != 201606"
+#endif
+
#ifdef __has_cpp_attribute
# if ! __has_cpp_attribute(maybe_unused)