diff --git a/bootrom/Makefile b/bootrom/Makefile
index 7aa360c3f..f9ac61db7 100644
--- a/bootrom/Makefile
+++ b/bootrom/Makefile
@@ -137,6 +137,7 @@ $(OBJDIR)/bootrom.elf: $(VERSIONOBJ) $(ASMOBJ) $(ARMOBJ) $(THUMBOBJ) $(ARMLIB_OB
 
 clean:
 	$(Q)$(RM) $(OBJDIR)$(PATHSEP)*.o
+	$(Q)$(RM) $(OBJDIR)$(PATHSEP)*.a
 	$(Q)$(RM) $(OBJDIR)$(PATHSEP)*.elf
 	$(Q)$(RM) $(OBJDIR)$(PATHSEP)*.s19
 	$(Q)$(RM) $(OBJDIR)$(PATHSEP)*.map
diff --git a/common_arm/Common.cmake b/common_arm/Common.cmake
index e6052f776..5b7a4921f 100644
--- a/common_arm/Common.cmake
+++ b/common_arm/Common.cmake
@@ -106,6 +106,7 @@ set(CROSS_CFLAGS ${CROSS_CFLAGS}
     ${INCLUDE}
     # -std=c99  TODO 暂时切换为c11标准，因为新的平台需要c11标准，AT32的官方库一堆c11写法，不这么做的话改起来很麻烦
     -std=c11
+    -fno-common
     -DON_DEVICE
     ${APP_CFLAGS})
 set(CROSS_LDFLAGS ${CROSS_LDFLAGS}
diff --git a/common_arm/Makefile.common b/common_arm/Makefile.common
index 174313200..a9799d5a2 100644
--- a/common_arm/Makefile.common
+++ b/common_arm/Makefile.common
@@ -97,7 +97,7 @@ ifeq ($(NOERROR),1)
 endif
 
 CROSS_CFLAGS ?= $(DEFCFLAGS)
-CROSS_CFLAGS += -c -std=c99 -mthumb-interwork -fno-builtin -ffunction-sections -fdata-sections
+CROSS_CFLAGS += -c -std=c99 -mthumb-interwork -fno-builtin -fno-common -ffunction-sections -fdata-sections
 # stack-protect, no-pie reduces size on Gentoo Hardened 8.2 gcc
 CROSS_CFLAGS += -fno-stack-protector -fno-pie
 CROSS_CFLAGS += -DON_DEVICE $(INCLUDE) $(APP_CFLAGS)