build: use C++14 language dialect

This commit makes the ios client compliant with C++14

Change-Id: I32934146c21a1ed26adc60789b0f5180aaef5b89

Ring/Ring.xcodeproj/project.pbxproj

@@ -1255,7 +1255,8 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
-				CLANG_CXX_LANGUAGE_STANDARD = "c++0x";
+				CLANG_CXX_LANGUAGE_STANDARD = "c++14";
+				CLANG_CXX_LIBRARY = "compiler-default";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
@@ -1284,7 +1285,8 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
-				CLANG_CXX_LANGUAGE_STANDARD = "c++0x";
+				CLANG_CXX_LANGUAGE_STANDARD = "c++14";
+				CLANG_CXX_LIBRARY = "compiler-default";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";

compile-ios.sh

@@ -120,7 +120,7 @@ do
         CFLAGS+=" -O3"
     fi
 
-    CXXFLAGS="-stdlib=libc++ $CFLAGS"
+    CXXFLAGS="-stdlib=libc++ -std=c++14 $CFLAGS"
     LDFLAGS="$CFLAGS"
 
 	./autogen.sh || exit 1