How to reduce compiled file size?

Question

Lets compare c and go: Hello_world.c :

#include
int main(){
    printf(\"Hello world!\");
}

Hello_world.go:

Answer 1

The 2016 answer:

1. Use Go 1.7

2. Compile with go build -ldflags "-s -w"

➜ ls -lh hello
-rwxr-xr-x 1 oneofone oneofone 976K May 26 20:49 hello*

3. Then use upx, goupx is no longer needed since 1.6.

➜ ls -lh hello
-rwxr-xr-x 1 oneofone oneofone 367K May 26 20:49 hello*