x86_64:Fix ld error.

LD: nuttx.elf
ld:in function `std::__1::ios_base::imbue(std::__1::locale const&)':
nuttx/libs/libxx/libcxx/src/ios.cpp:129: undefined reference to `_Unwind_Resume'

Signed-off-by: cuiziwei <cuiziwei@xiaomi.com>

arch/x86_64/src/Makefile

@@ -97,6 +97,10 @@ ifeq ($(CONFIG_LIBSUPCXX),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libsupc++.a}}
 endif
 
+ifeq ($(CONFIG_CXX_EXCEPTION),y)
+  EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc_eh.a}}
+endif
+
 VPATH = chip:common:$(ARCH_SUBDIR)
 
 all: libarch$(LIBEXT)

arch/x86_64/src/common/Toolchain.defs

@@ -138,6 +138,8 @@ AFLAGS += -Wa,--divide
 endif
 
 EXEEXT = .elf
+	
+LDFLAGS += -nostdlib -static
 
 # Loadable module definitions