diff --git a/benchmarks/sizeof/main.cpp b/benchmarks/sizeof/main.cpp
index 90573c614..4f5e236d0 100644
--- a/benchmarks/sizeof/main.cpp
+++ b/benchmarks/sizeof/main.cpp
@@ -5,9 +5,16 @@ using namespace Upp;
 CONSOLE_APP_MAIN
 {
 	StdLogSetup(LOG_COUT|LOG_FILE);
+
 #ifdef CPU_64
 	RLOG("CPU_64");
 #endif
+#ifdef CPU_UNALIGNED
+	RLOG("CPU_UNALIGNED");
+#endif
+#ifdef CPU_LE
+	RLOG("CPU_LE");
+#endif
 #ifdef CPP_11
 	RLOG("CPP_11");
 #endif
diff --git a/uppsrc/Core/Mt.cpp b/uppsrc/Core/Mt.cpp
index d66ce8839..2198c599b 100644
--- a/uppsrc/Core/Mt.cpp
+++ b/uppsrc/Core/Mt.cpp
@@ -415,6 +415,7 @@ void WriteMemoryBarrier() {
 
 #else
 
+#ifndef COMPILER_GCC
 void ReadMemoryBarrier()
 {
 	static Atomic x;
@@ -424,6 +425,7 @@ void ReadMemoryBarrier()
 void WriteMemoryBarrier() {
 	ReadMemoryBarrier();
 }
+#endif
 
 #endif
 
diff --git a/uppsrc/Core/Mt.h b/uppsrc/Core/Mt.h
index 09417addd..fa9644284 100644
--- a/uppsrc/Core/Mt.h
+++ b/uppsrc/Core/Mt.h
@@ -148,6 +148,16 @@ inline void WriteMemoryBarrier() {
 	#endif
 #endif
 }
+#elif defined(COMPILER_GCC)
+inline void ReadMemoryBarrier()
+{
+	__sync_synchronize();
+}
+
+inline void WriteMemoryBarrier()
+{
+	__sync_synchronize();
+}
 #endif
 
 #ifdef CPU_BLACKFIN
diff --git a/uppsrc/Core/config.h b/uppsrc/Core/config.h
index 6ee8991bc..8a6cfef5f 100644
--- a/uppsrc/Core/config.h
+++ b/uppsrc/Core/config.h
@@ -81,9 +81,18 @@
 	#elif __arm__
 		#define CPU_32 1
 		#define CPU_ARM 1
-		#define CPU_LE 1
-		#define CPU_LITTLE_ENDIAN 1
-		#define CPU_ALIGNED 1
+		#ifdef __ARM_BIG_ENDIAN
+			#define CPU_BE 1
+			#define CPU_BIG_ENDIAN 1
+		#else
+			#define CPU_LE 1
+			#define CPU_LITTLE_ENDIAN 1
+		#endif
+		#ifdef __ARM_FEATURE_UNALIGNED
+			#define CPU_UNALIGNED 1
+		#else
+			#define CPU_ALIGNED 1
+		#endif
 	#elif __bfin
 		#define CPU_32 1
 		#define CPU_BLACKFIN