Ignore GCC warnings.

* 4.9 missing initializer warnings
* pedantic for __int128 case
* Wrap diagnostic push and pop in tz.cpp and date.h.

date.h

@@ -5,6 +5,7 @@
 //
 // Copyright (c) 2015, 2016, 2017 Howard Hinnant
 // Copyright (c) 2016 Adrian Colomitchi
+// Copyright (c) 2017 Florian Dang
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -50,6 +51,15 @@
 #include <utility>
 #include <type_traits>
 
+#ifdef __GNUC__
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wpedantic"
+# if __GNUC__ < 5
+   // GCC 4.9 Bug 61489 Wrong warning with -Wmissing-field-initializers
+#  pragma GCC diagnostic ignored "-Wmissing-field-initializers"
+# endif
+#endif
+
 namespace date
 {
 
@@ -902,12 +912,6 @@ public:
         {}
 };
 
-#ifdef __GNUC__
-// GCC complains about __int128 with -pedantic or -pedantic-errors
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wpedantic"
-#endif
-
 template <class T>
 struct choose_trunc_type
 {
@@ -929,10 +933,6 @@ struct choose_trunc_type
                  >::type;
 };
 
-#ifdef __GNUC__
-#pragma GCC diagnostic pop
-#endif
-
 template <class T>
 CONSTCD11
 inline
@@ -6590,4 +6590,10 @@ parse(const CharT* format, Parsable& tp,
 
 }  // namespace date
 
+
+#ifdef __GNUC__
+# pragma GCC diagnostic pop
+#endif
+
+
 #endif  // DATE_H

tz.cpp

@@ -141,6 +141,12 @@ static CONSTDATA char folder_delimiter = '/';
 
 #endif
 
+#if __GNUC__ < 5
+// GCC 4.9 Bug 61489 Wrong warning with -Wmissing-field-initializers
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wmissing-field-initializers"
+#endif
+
 #ifdef _WIN32
 
 namespace
@@ -3100,12 +3106,6 @@ current_zone()
 
 #else // !WIN32
 
-#ifdef __GNUC__
-// GCC complains about unused return from strerror_r
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-result"
-#endif
-
 const time_zone*
 current_zone()
 {
@@ -3183,10 +3183,6 @@ current_zone()
     throw std::runtime_error("Could not get current timezone");
 }
 
-#ifdef __GNUC__
-#pragma GCC diagnostic pop
-#endif
-
 #endif // !WIN32
 
 #if defined(TZ_TEST) && defined(TIMEZONE_MAPPING)
@@ -3208,4 +3204,9 @@ locate_native_zone(const std::string& native_tz_name)
 
 #endif  // TZ_TEST && TIMEZONE_MAPPING
 
+
 }  // namespace date
+
+#if __GNUC__ < 5
+# pragma GCC diagnostic pop
+#endif