--- Libc/Libc-825.25/xcodescripts/generate_features.pl
+++ Libc/Libc-1353.100.2/xcodescripts/generate_features.pl
@@ -1,8 +1,4 @@
 #!/usr/bin/perl
-
-if ($ENV{"ACTION"} eq "installhdrs") {
-	exit 0;
-}
 
 # Generates the libc-features.h files used to control #ifdef behaviour in Libc
 use warnings;
@@ -23,9 +19,9 @@
 {
 	# set ENV{"CURRENT_ARCH"} so we can predicate on it
 	$ENV{"CURRENT_ARCH"} = $arch;
-	
-	my $platformName = $ENV{"PLATFORM_NAME"};
-	$platformName = "iphoneos" if ($platformName eq "iphonesimulator");
+
+	my $platformName = $ENV{"VARIANT_PLATFORM_NAME"};
+	$platformName =~ s/simulator/os/;
 
 	my $platformPath = $ENV{"SRCROOT"} . "/Platforms/" . $platformName . "/Makefile.inc";
 	my $featuresHeaderDir = $ENV{"DERIVED_FILES_DIR"}."/".$arch;
@@ -51,7 +47,7 @@
 			my $regex = $2;
 			
 			$nested++;
-			if ($ENV{$envvar} !~ /$regex/) {
+			if (!defined($ENV{$envvar}) || ($ENV{$envvar} !~ /$regex/)) {
 				$skip += 1;
 			}
 		}
@@ -80,10 +76,11 @@
 	elsif ($unifdef == 1) {
 		# assume FEATURE_BLOCKS was on by default
 		$unifdefs{"UNIFDEF_BLOCKS"} = 1;
+		$unifdefs{"UNIFDEF_DRIVERKIT"} = defined($ENV{"DRIVERKITSDK"});
 		$unifdefs{"UNIFDEF_LEGACY_64_APIS"} = defined($features{"FEATURE_LEGACY_64_APIS"});
 		$unifdefs{"UNIFDEF_LEGACY_RUNE_APIS"} = defined($features{"FEATURE_LEGACY_RUNE_APIS"});
 		$unifdefs{"UNIFDEF_LEGACY_UTMP_APIS"} = defined($features{"FEATURE_LEGACY_UTMP_APIS"});
-		$unifdefs{"UNIFDEF_MOVE_LOCALTIME"} = defined($features{"FEATURE_MOVE_LOCALTIME"});
+		$unifdefs{"UNIFDEF_POSIX_ILP32_ALLOW"} = defined($features{"FEATURE_POSIX_ILP32_ALLOW"});
 		
 		my $output = "";
 		for my $d (keys %unifdefs) {
@@ -100,7 +97,7 @@
 		my $platform_mtime = (stat($platformPath))[9];
 		my $header_mtime = (stat($featuresHeader))[9];
 
-		if ($header_mtime > $platform_mtime) {
+		if (defined($header_mtime) && defined($platform_mtime) && ($header_mtime > $platform_mtime)) {
 			exit 0;
 		}
 
@@ -123,6 +120,9 @@
 		my $shortarch = $arch;
 		$shortarch =~ s/armv\d+[a-z]?/arm/g;
 
+		# map all arm64 subtypes to arm64
+		$shortarch =~ s/arm64[_a-z0-9]*/arm64/g;
+
 		printf HEADER "#if !defined(__".$shortarch."__)\n";
 		printf HEADER "#error Mismatched libc-features.h architecture\n";
 		printf HEADER "#endif\n\n";
@@ -143,12 +143,6 @@
 			printf HEADER "#define UNIFDEF_LEGACY_UTMP_APIS 1\n";
 		} else {
 			printf HEADER "/* #undef UNIFDEF_LEGACY_UTMP_APIS */\n";
-		}
-
-		if (defined($features{"FEATURE_MOVE_LOCALTIME"})) {
-			printf HEADER "#define UNIFDEF_MOVE_LOCALTIME 1\n";
-		} else {
-			printf HEADER "/* #undef UNIFDEF_MOVE_LOCALTIME */\n";
 		}
 
 		if (defined($features{"FEATURE_ONLY_1050_VARIANTS"})) {
@@ -187,12 +181,6 @@
 			printf HEADER "/* #undef __APPLE_PR3417676_HACK__ */\n";
 		}
 
-		if (defined($features{"FEATURE_PATCH_5243343"})) {
-			printf HEADER "#define PR_5243343 1\n";
-		} else {
-			printf HEADER "/* #undef PR_5243343 */\n";
-		}
-
 		if (defined($features{"FEATURE_PLOCKSTAT"})) {
 			printf HEADER "#define PLOCKSTAT 1\n";
 		} else {
@@ -205,16 +193,22 @@
 			printf HEADER "/* #undef NOTIFY_TZ */\n";
 		}
 
-		if (defined($features{"FEATURE_NO_LIBCRASHREPORTERCLIENT"})) {
-			printf HEADER "#define LIBC_NO_LIBCRASHREPORTERCLIENT 1\n";
-		} else {
-			printf HEADER "/* #undef LIBC_NO_LIBCRASHREPORTERCLIENT */\n";
-		}
-
-		if (defined($features{"FEATURE_MEMORYSTATUS"})) {
-			printf HEADER "#define CONFIG_MEMORYSTATUS 1\n";
-		} else {
-			printf HEADER "/* #undef CONFIG_MEMORYSTATUS */\n";
+		if (defined($features{"FEATURE_SMALL_STDIOBUF"})) {
+			printf HEADER "#define FEATURE_SMALL_STDIOBUF 1\n";
+		} else {
+			printf HEADER "/* #undef FEATURE_SMALL_STDIOBUF */\n";
+		}
+
+		if (defined($features{"FEATURE_XPRINTF_PERF"})) {
+			printf HEADER "#define XPRINTF_PERF 1\n";
+		} else {
+			printf HEADER "/* #undef XPRINTF_PERF */\n";
+		}
+
+		if (defined($features{"FEATURE_SIGNAL_RESTRICTION"})) {
+			printf HEADER "#define FEATURE_SIGNAL_RESTRICTION 1\n";
+		} else {
+			printf HEADER "/* #undef FEATURE_SIGNAL_RESTRICTION */\n";
 		}
 
 		printf HEADER "#endif // _LIBC_FEATURES_H_\n";