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/home/book/Documents/tuya/Projects/feed_tool_os/software/TuyaOS/vendor/rtl8720cf_ameba/toolchain/asdk-6.4.1/linux/newlib/bin/../lib/gcc/arm-none-eabi/6.4.1/../../../../arm-none-eabi/bin/ld: warning: changing start of section .ram.code_text by 4 bytes
/home/book/Documents/tuya/Projects/feed_tool_os/software/TuyaOS/vendor/rtl8720cf_ameba/toolchain/asdk-6.4.1/linux/newlib/bin/../lib/gcc/arm-none-eabi/6.4.1/../../../../arm-none-eabi/bin/ld: warning: changing start of section .system_restore_data by 24 bytes
/home/book/Documents/tuya/Projects/feed_tool_os/software/TuyaOS/vendor/rtl8720cf_ameba/toolchain/asdk-6.4.1/linux/newlib/bin/../lib/gcc/arm-none-eabi/6.4.1/../../../../arm-none-eabi/bin/ld: warning: section .bss' type changed to PROGBITS
application_is/Debug/obj/main_application_is.o: In functionmain':
/home/book/Documents/tuya/Projects/feed_tool_os/software/TuyaOS/vendor/rtl8720cf_ameba/rtl8720cf-os/project/realtek_amebaz2_v0_example/GCC-RELEASE/../../../../tuyaos/tuyaos_adapter/src/main.c:38: undefined reference to `tuya_app_main'
collect2: error: ld returned 1 exit status
application.is.mk recipe for target 'application_is' failed
make[2]: *** [application_is] Error 1
make[2]: Leaving directory '/home/book/Documents/tuya/Projects/feed_tool_os/software/TuyaOS/vendor/rtl8720cf_ameba/rtl8720cf-os/project/realtek_amebaz2_v0_example/GCC-RELEASE'
Makefile:11: recipe for target 'is' failed
make[1]: *** [is] Error 2
make[1]: Leaving directory '/home/book/Documents/tuya/Projects/feed_tool_os/software/TuyaOS/vendor/rtl8720cf_ameba/rtl8720cf-os/project/realtek_amebaz2_v0_example/GCC-RELEASE'
/home/book/Documents/tuya/Projects/feed_tool_os/software/TuyaOS/scripts/mk/app.mk:186: recipe for target 'app_by_name' failed
make: *** [app_by_name] Error 2

看报错信息，应该是你新建的工程中没有实现入口程序 tuya_app_main，该函数是入口函数，需要应用自己实现