diff --git a/Makefile b/Makefile
index 19944192..16a09f47 100644
--- a/Makefile
+++ b/Makefile
@@ -1,19 +1,16 @@
-.PHONY: all build_src build_test test clean
+.PHONY: all src test clean
 
-all: build_src build_test
+all: src
 
 submodule:
 	git submodule init
 	git submodule update
 	cd deps/sgx_protect_file && make
 
-build_src:
+src:
 	@$(MAKE) --no-print-directory -C src
 
-build_test:
-	@$(MAKE) --no-print-directory -C test
-
-test: build_test
+test:
 	@$(MAKE) --no-print-directory -C test run
 
 clean:
diff --git a/src/libos/Cargo.toml b/src/libos/Cargo.toml
index 75f56a60..3861aef7 100644
--- a/src/libos/Cargo.toml
+++ b/src/libos/Cargo.toml
@@ -3,7 +3,7 @@ name = "Occlum"
 version = "0.0.1"
 
 [lib]
-name = "libos"
+name = "occlum_rs"
 crate-type = ["staticlib"]
 
 [dependencies]
diff --git a/src/libos/Makefile b/src/libos/Makefile
index abcb38a8..0abbf47b 100644
--- a/src/libos/Makefile
+++ b/src/libos/Makefile
@@ -4,7 +4,7 @@ DEBUG=1
 
 LIBOS_ENCLAVE := libocclum.signed.so
 LIBOS_SO := libocclum.so # Link $(LIBOS_A), $(C_OBJS) and all dependencies
-LIBOS_A := liblibos.a # Built from Rust code
+LIBOS_A := libocclum_rs.a # Built from Rust code
 
 RUST_SRCS := $(wildcard src/*.rs src/*/*.rs src/*/*/*.rs)
 C_SRCS := $(sort $(filter-out src/Enclave_t.c, $(wildcard src/*.c src/*/*.c))) src/Enclave_t.c
@@ -18,7 +18,7 @@ ENCLAVE_KEY := Enclave_private.pem
 
 C_FLAGS := $(SGX_CFLAGS_T) -fno-stack-protector -I./include/
 _Other_Link_Flags := -L../../deps/rust-sgx-sdk/compiler-rt/ -L.
-_Other_Enclave_Libs := -lcompiler-rt-patch -llibos -lsgx_tprotected_fs
+_Other_Enclave_Libs := -lcompiler-rt-patch -locclum_rs -lsgx_tprotected_fs
 LINK_FLAGS := $(SGX_LFLAGS_T)
 
 .PHONY: all compiler-rt clean
@@ -43,19 +43,21 @@ $(S_OBJS): %.o: %.S
 
 $(EDL_C_SRCS): $(SGX_EDGER8R) ../Enclave.edl
 	@cd src/ && $(SGX_EDGER8R) --trusted ../../Enclave.edl --search-path $(SGX_SDK)/include --search-path ../../../deps/rust-sgx-sdk/edl/
-	@echo "GEN  => $(EDL_C_SRCS)"
+	@echo "GEN  <= $(EDL_C_SRCS)"
 
 compiler-rt:
-	@$(MAKE) --no-print-directory -C ../../deps/rust-sgx-sdk/compiler-rt/ 2> /dev/null
+	@$(MAKE) --no-print-directory -C ../../deps/rust-sgx-sdk/compiler-rt/ > /dev/null
 
 ifeq ($(DEBUG), 1)
 $(LIBOS_A): $(RUST_SRCS)
-	RUSTC_BOOTSTRAP=1 cargo build
-	cp ./target/debug/$(LIBOS_A) $(LIBOS_A)
+	@RUSTC_BOOTSTRAP=1 cargo build
+	@cp ./target/debug/$(LIBOS_A) $(LIBOS_A)
+	@echo "CARGO (debug) => $(LIBOS_A)"
 else
 $(LIBOS_A): $(RUST_SRCS)
-	RUSTC_BOOTSTRAP=1 cargo build --release
-	cp ./target/release/$(LIBOS_A) $(LIBOS_A)
+	@RUSTC_BOOTSTRAP=1 cargo build --release
+	@cp ./target/release/$(LIBOS_A) $(LIBOS_A)
+	@echo "CARGO (release) => $(LIBOS_A)"
 endif
 
 clean:
diff --git a/src/libos/src/lib.rs b/src/libos/src/lib.rs
index 1eb64503..b33bcc5f 100644
--- a/src/libos/src/lib.rs
+++ b/src/libos/src/lib.rs
@@ -1,6 +1,6 @@
 #![allow(unused)]
 
-#![crate_name = "libos"]
+#![crate_name = "occlum_rs"]
 #![crate_type = "staticlib"]
 
 #![cfg_attr(not(target_env = "sgx"), no_std)]
diff --git a/src/pal/Makefile b/src/pal/Makefile
index cc191410..0eb29021 100644
--- a/src/pal/Makefile
+++ b/src/pal/Makefile
@@ -11,6 +11,7 @@ Link_Flags := $(SGX_LFLAGS_U)
 Link_Flags += -L../../deps/rust-sgx-sdk/sgx_ustdc/ -lsgx_ustdc -lsgx_uprotected_fs
 
 
+.PHONY: all
 all: $(Bin)
 
 $(Bin): $(EDL_Gen_Files) $(Objs) sgx_ustdc
@@ -30,8 +31,7 @@ $(Objs): %.o: %.c
 #
 .PHONY: sgx_ustdc
 sgx_ustdc:
-	@$(MAKE) --no-print-directory -C ../../deps/rust-sgx-sdk/sgx_ustdc/ 2> /dev/null
-
+	@$(MAKE) --no-print-directory -C ../../deps/rust-sgx-sdk/sgx_ustdc/ > /dev/null
 
 .PHONY: clean
 clean:
diff --git a/src/pal/atomic.h b/src/pal/atomic.h
index bce3381b..9118a260 100644
--- a/src/pal/atomic.h
+++ b/src/pal/atomic.h
@@ -1,11 +1,11 @@
 #ifndef __ATOMIC_H_
 #define __ATOMIC_H_
 
-static inline int a_load(int* n) {
+static inline int a_load(volatile int* n) {
     return *(volatile int*)n;
 }
 
-static inline int a_fetch_and_add(int* n, int a) {
+static inline int a_fetch_and_add(volatile int* n, int a) {
     return __sync_fetch_and_add(n, a);
 }
 
diff --git a/src/pal/futex.c b/src/pal/futex.c
index cf7ed4b2..7c74577b 100644
--- a/src/pal/futex.c
+++ b/src/pal/futex.c
@@ -18,15 +18,15 @@ static inline long __syscall6(long n, long a1, long a2, long a3, long a4, long a
 #define syscall(num, a1, a2, a3, a4, a5, a6) \
     __syscall6((num), (long)(a1), (long)(a2), (long)(a3), (long)(a4), (long)(a5), (long)(a6))
 
-static inline int futex(void *addr1, int op, int val1, struct timespec *timeout,
+static inline int futex(volatile void *addr1, int op, int val1, struct timespec *timeout,
                 void *addr2, int val3) {
     return (int) syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3);
 }
 
-int futex_wait(int* uaddr, int val) {
+int futex_wait(volatile int* uaddr, int val) {
     return futex(uaddr, FUTEX_WAIT, val, NULL, NULL, 0);
 }
 
-int futex_wakeup(int* uaddr) {
+int futex_wakeup(volatile int* uaddr) {
     return futex(uaddr, FUTEX_WAKE, INT_MAX, NULL, NULL, 0);
 }
diff --git a/src/pal/futex.h b/src/pal/futex.h
index 4e037b67..da87e00c 100644
--- a/src/pal/futex.h
+++ b/src/pal/futex.h
@@ -3,7 +3,7 @@
 
 #include <sys/time.h>
 
-int futex_wait(int* uaddr, int val);
-int futex_wakeup(int* uaddr);
+int futex_wait(volatile int* uaddr, int val);
+int futex_wakeup(volatile int* uaddr);
 
 #endif /* __ATOMIC_H_ */
diff --git a/src/pal/pal.c b/src/pal/pal.c
index 24353177..b02d1a57 100644
--- a/src/pal/pal.c
+++ b/src/pal/pal.c
@@ -169,7 +169,6 @@ int initialize_enclave(const char* enclave_path)
         if (fp != NULL) fclose(fp);
         return -1;
     }
-    printf("[+] global_eid: %ld\n", global_eid);
 
     /* Step 3: save the launch token if it is updated */
     if (updated == FALSE || fp == NULL) {
diff --git a/src/pal/task.c b/src/pal/task.c
index b0eca86d..6c7db174 100644
--- a/src/pal/task.c
+++ b/src/pal/task.c
@@ -6,8 +6,9 @@
 #include "sgx_urts.h"
 #include "Enclave_u.h"
 
-static int num_tasks = 0;
-static int main_task_status = 0;
+static volatile int num_tasks = 0;
+static volatile int main_task_status = 0;
+static volatile int any_fatal_error = 0;
 
 static int BEGIN_TASK(void) {
     return a_fetch_and_add(&num_tasks, 1) == 0;
@@ -32,6 +33,7 @@ static void* __run_task_thread(void* _data) {
     if(sgx_ret != SGX_SUCCESS) {
         // TODO: deal with ECALL error
         printf("ERROR: ECall libos_run failed\n");
+        any_fatal_error = 1;
     }
 
     if (data->is_main_task) main_task_status = status;
@@ -64,5 +66,5 @@ int wait_all_tasks(void) {
     while ((cur_num_tasks = a_load(&num_tasks)) != 0) {
         futex_wait(&num_tasks, cur_num_tasks);
     }
-    return main_task_status;
+    return any_fatal_error ? -1 : main_task_status;
 }
diff --git a/src/sgxenv.mk b/src/sgxenv.mk
index a33a1216..4bd5981d 100644
--- a/src/sgxenv.mk
+++ b/src/sgxenv.mk
@@ -69,6 +69,7 @@ endif
 #
 SGX_CFLAGS_T := $(SGX_COMMON_CFLAGS) -nostdinc -fvisibility=hidden -fpie -fstack-protector
 SGX_CFLAGS_T += -I$(SGX_SDK)/include -I$(SGX_SDK)/include/tlibc -I$(SGX_SDK)/include/stlport -I$(SGX_SDK)/include/epid
+
 # Before use this linker flag, the user should define $(_Other_Enclave_Libs),
 # and $(_Other_Link_Flags)
 #
diff --git a/test/Makefile b/test/Makefile
index 0ad8fa51..91a0216c 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -6,6 +6,11 @@ BUILD_TEST_SUITES := $(TEST_SUITES:%=%)
 RUN_TEST_SUITES := $(TEST_SUITES:%=run-%)
 CLEAN_TEST_SUITES := $(TEST_SUITES:%=clean-%)
 
+CYAN :=\033[1;36m
+GREEN :=\033[1;32m
+RED :=\033[1;31m
+NO_COLOR :=\033[0m
+
 .PHONY: all build test clean $(BUILD_TEST_SUITES) $(RUN_TEST_SUITES) $(CLEAN_TEST_SUITES)
 
 #############################################################################
@@ -17,7 +22,9 @@ all: build
 build: $(BUILD_TEST_SUITES)
 
 $(BUILD_TEST_SUITES): %:
-	@$(MAKE) -C $@
+	@echo "$(CYAN)BUILD TEST => $@$(NO_COLOR)"
+	@$(MAKE) --no-print-directory -C $@
+	@echo "$(GREEN)DONE$(NO_COLOR)"
 
 #############################################################################
 # Run tests
@@ -26,13 +33,19 @@ $(BUILD_TEST_SUITES): %:
 run: build $(RUN_TEST_SUITES)
 
 pal: $(PROJECT_DIR)/src/pal/pal
-	cp $< pal
+	@cp $< pal
 
 libocclum.signed.so: $(PROJECT_DIR)/src/libos/libocclum.signed.so
-	cp $< libocclum.signed.so
+	@cp $< libocclum.signed.so
 
 $(RUN_TEST_SUITES): run-%: % pal libocclum.signed.so
-	@$(MAKE) -C $< run
+	@echo "$(CYAN)TEST => $<$(NO_COLOR)"
+	@$(MAKE) --no-print-directory -C $< run ; \
+		if [ $$? -eq 0 ] ; then \
+			echo "$(GREEN)PASS$(NO_COLOR)" ; \
+		else \
+			echo "$(RED)FAILED$(NO_COLOR)" ; \
+		fi ;
 
 #############################################################################
 # Misc
@@ -42,4 +55,4 @@ clean: $(CLEAN_TEST_SUITES)
 	@$(RM) -f pal libocclum.signed.so
 
 $(CLEAN_TEST_SUITES): clean-%:
-	@$(MAKE) -C $(patsubst clean-%,%,$@) clean
+	@$(MAKE) --no-print-directory -C $(patsubst clean-%,%,$@) clean
diff --git a/test/hello_world/main.c b/test/hello_world/main.c
index a0bd3801..9ca7457d 100644
--- a/test/hello_world/main.c
+++ b/test/hello_world/main.c
@@ -4,7 +4,7 @@
 
 static const char* msg = "Hello World\n";
 
-int main(void) {
+int main(int argc) {
     printf("%s", msg);
     return 0;
 }
diff --git a/test/test_common.mk b/test/test_common.mk
index 8c94d41a..0558f7e5 100644
--- a/test/test_common.mk
+++ b/test/test_common.mk
@@ -25,34 +25,42 @@ LINK_FLAGS = $(C_FLAGS) $(EXTRA_LINK_FLAGS)
 all: $(BIN_ENC_NAME)
 
 $(BIN_ENC_NAME): $(BIN_NAME)
-	$(RM) -f $(BIN_ENC_NAME)
-	cd $(PROJECT_DIR)/deps/sgx_protect_file/ && \
-		./sgx_protect_file encrypt -i $(CUR_DIR)/$(BIN_NAME) -o $(CUR_DIR)/$(BIN_ENC_NAME) -k 123
+	@$(RM) -f $(BIN_ENC_NAME)
+	@cd $(PROJECT_DIR)/deps/sgx_protect_file/ && \
+		./sgx_protect_file encrypt \
+			-i $(CUR_DIR)/$(BIN_NAME) \
+			-o $(CUR_DIR)/$(BIN_ENC_NAME) \
+			-k 123 > /dev/null
+	@echo "GEN => $@"
 
 debug: $(OBJDUMP_FILE) $(READELF_FILE)
 
 $(OBJDUMP_FILE): $(BIN_NAME)
-	objdump -d $(BIN_NAME) > $(OBJDUMP_FILE)
+	@objdump -d $(BIN_NAME) > $(OBJDUMP_FILE)
+	@echo "OBJDUMP => $@"
 
 $(READELF_FILE): $(BIN_NAME)
-	readelf -a -d $(BIN_NAME) > $(READELF_FILE)
+	@readelf -a -d $(BIN_NAME) > $(READELF_FILE)
+	@echo "READELF => $@"
 
 $(BIN_NAME): $(C_OBJS)
-	$(CC) $^ $(LINK_FLAGS) -o $(BIN_NAME)
+	@$(CC) $^ $(LINK_FLAGS) -o $(BIN_NAME) 2> /dev/null
+	@echo "LINK => $@"
 
 $(C_OBJS): %.o: %.c
-	$(CC) $(C_FLAGS) -c $< -o $@
+	@$(CC) $(C_FLAGS) -c $< -o $@ 2> /dev/null
+	@echo "CC <= $@"
 
 #############################################################################
 # Test
 #############################################################################
 
 run: $(BIN_ENC_NAME)
-	cd ../ && RUST_BACKTRACE=1 ./pal $(CUR_DIR)/$(BIN_ENC_NAME)
+	@cd ../ && RUST_BACKTRACE=1 ./pal $(CUR_DIR)/$(BIN_ENC_NAME)
 
 #############################################################################
 # Misc
 #############################################################################
 
 clean:
-	$(RM) -f *.o *.S $(BIN_NAME) $(BIN_ENC_NAME) $(OBJDUMP_FILE) $(READELF_FILE)
+	@-$(RM) -f *.o *.S $(BIN_NAME) $(BIN_ENC_NAME) $(OBJDUMP_FILE) $(READELF_FILE)