libstdc++: Fix preprocessor check for C++17

libstdc++-v3/ChangeLog:

	* include/bits/regex.h (basic_regex::multiline): Fix #if
	condition.

diff --git a/libstdc++-v3/include/bits/regex.h b/libstdc++-v3/include/bits/regex.h
index ad33ecaa14b70e6eca6acd259770d504e27cc5d7..664944b0ef27073325156136fa245036e616559b 100644 (file)
--- a/libstdc++-v3/include/bits/regex.h
+++ b/libstdc++-v3/include/bits/regex.h
@@ -424,7 +424,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       static constexpr flag_type awk = regex_constants::awk;
       static constexpr flag_type grep = regex_constants::grep;
       static constexpr flag_type egrep = regex_constants::egrep;
-#if __cplusplus >= 2017
+#if __cplusplus >= 201703L
       static constexpr flag_type multiline = regex_constants::multiline;
 #endif
       ///@}