Add .gitignore file

guowenxue

2024-08-21 ea2b03a649f50c54e8ac0a77dbe77e3151712390

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all: update_cross
    @./build.sh
 
clean:
    @./build.sh -c
 
update_cross:
ifdef CROSS_COMPILE
    sed -i 's|^CROSS_COMPILE=.*|CROSS_COMPILE=${CROSS_COMPILE}|g' build.sh
endif