undefined reference to `__exidx_start‘ undefined reference to `__exidx_end‘ 编译错误

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usr/local/gcc-arm-none-eabi-6-2017-q2-update/bin/../lib/gcc/arm-none-eabi/6.3.1/libgcc.a(unwind-arm.o): In function `get_eit_entry':
unwind-arm.c:(.text+0x210): undefined reference to `__exidx_start'
unwind-arm.c:(.text+0x214): undefined reference to `__exidx_end'
collect2: error: ld returned 1 exit status

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liu@ubuntu:~$ /usr/local/gcc-arm-none-eabi-6-2017-q2-update/bin/arm-none-eabi-ld --verbose|less

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PROVIDE (__etext = .);
  PROVIDE (_etext = .);
  PROVIDE (etext = .);
  .rodata         : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
  .rodata1        : { *(.rodata1) }
  .ARM.extab   : { *(.ARM.extab* .gnu.linkonce.armextab.*) }
   PROVIDE_HIDDEN (__exidx_start = .);
  .ARM.exidx   : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) }
   PROVIDE_HIDDEN (__exidx_end = .);
  .eh_frame_hdr : { *(.eh_frame_hdr) *(.eh_frame_entry .eh_frame_entry.*) }
  .eh_frame       : ONLY_IF_RO { KEEP (*(.eh_frame)) *(.eh_frame.*) }
  .gcc_except_table   : ONLY_IF_RO { *(.gcc_except_table
  .gcc_except_table.*) }
  .gnu_extab   : ONLY_IF_RO { *(.gnu_extab*) }
  /* These sections are generated by the Sun/Oracle C++ compiler.  */
  .exception_ranges   : ONLY_IF_RO { *(.exception_ranges
  .exception_ranges*) }
  /* Adjust the address for the data segment.  We want to adjust up to
     the same address within the page on the next page up.  */
  . = ALIGN(CONSTANT (MAXPAGESIZE)) + (. & (CONSTANT (MAXPAGESIZE) - 1));
  /* Exception handling  */
  .eh_frame       : ONLY_IF_RW { KEEP (*(.eh_frame)) *(.eh_frame.*) }
  .gnu_extab      : ONLY_IF_RW { *(.gnu_extab) }

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    PROVIDE_HIDDEN (__exidx_start = .);
  .ARM.exidx   : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) }
   PROVIDE_HIDDEN (__exidx_end = .);