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What do these Go build flags mean? netgo -extldflags "-lm -lstdC ++ -static" '

I am currently pursuing an online microservice course where I deploy small application apps to docker containers. The long and ugly command line for creating binaries is as follows:

go build --tags netgo --ldflags '-extldflags "-lm -lstdc++ -static"'

so far i just used go install to compile my go application.

Can someone explain this command to me?

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