Thanks Alan, I re-downloaded the source code and the problem was solved.It's a 
bit strange.

> 2020年8月3日 下午10:04,Nii Jyeni <niijy...@hotmail.com> 写道:
> 
> OS:MacOS
> Nuttx:nightly
> Arm-none-eabi-gcc:7.3.1
> 
> …
> arning: /Library/Developer/CommandLineTools/usr/bin/ranlib: warning for 
> library: libbinfmt.a the table of contents is empty (no object file members 
> in the library define global symbols)
> IN: binfmt/libbinfmt.a -> staging/libbinfmt.a
> CC:  board/stm32_boot.c
> CC:  board/stm32_bringup.c
> CC:  board/stm32_spi.c
> CC:  board/stm32_userleds.c
> CC:  board/stm32_appinit.c
> CC:  board/stm32_extmem.c
> CC:  board/stm32_lcd.c
> CC:  board/stm32_adc.c
> ar rcs  libboard.a   stm32_boot.o stm32_bringup.o stm32_spi.o 
> stm32_userleds.o stm32_appinit.o stm32_extmem.o stm32_lcd.o stm32_adc.o
> warning: /Library/Developer/CommandLineTools/usr/bin/ranlib: warning for 
> library: libboard.a the table of contents is empty (no object file members in 
> the library define global symbols)
> LD: nuttx
> arm-none-eabi-ld: warning: cannot find entry symbol __start; defaulting to 
> 0000000008000000
> 
> Does anybody know what's going on?
> 
> 
> Enjoy your life!
> ---------------------------------------------
> Nii Jyeni
> 
> 13880639629
> niijy...@hotmail.com
> www.niijyeni.org
> [https://a.gfx.ms/emoji_1F680.png]Sent from Outlook.com

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