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Golang cross-compile with CGO

Golang has the neat funcitionality to cross-compile to different target architectures. This is very useful and very easy by just set env-vars GOOS and GOARCH. There are cases when the process of cross-compilation is getting complicated. Specifically when CGO is in the mix. On Linux this is typically quite easy, but when on different architectures this can be a challenge.

When using sqlite it is necessary to use CGO_ENABLED. To cross-compile from a Mac source-system to e.g. Linux there is a nice support which is described in this blog-post: https://www.yellowduck.be/posts/cross-compile-a-go-package-which-uses-sqlite3

1. Install musl-cross -> "One-click static-friendly musl-based GCC macOS-to-Linux cross-compilers" (https://github.com/FiloSottile/homebrew-musl-cross)

   brew install FiloSottile/musl-cross/musl-cross

2. Compile by specifying CC and CXX

   CC=x86_64-linux-musl-gcc CXX=x86_64-linux-musl-g++ GOARCH=amd64 GOOS=linux CGO_ENABLED=1 go build -ldflags "-linkmode external -extldflags -static" ./...

The result is the correct platform-specific build: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked