How do I compile a fully statically linked Rust binaries?

• https://github.com/japaric/rust-cross#how-do-i-compile-a-fully-statically-linked-rust-binaries

How do I compile a fully statically linked Rust binaries?

Short answer: cargo build --target x86_64-unknown-linux-musl

For targets of the form *-*-linux-gnu*, rustc always produces binaries dynamically linked to glibc and other libraries:

$ cargo new --bin hello
$ cargo build --target x86_64-unknown-linux-gnu
$ file target/x86_64-unknown-linux-gnu/debug/hello
target/x86_64-unknown-linux-gnu/debug/hello: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /usr/x86_64-pc-linux-gnu/lib/ld-linux-x86-64.so.2, for GNU/Linux 2.6.34, BuildID[sha1]=a3fa7281e9ded30372b5131a2feb6f1e78a6f1cd, not stripped
$ ldd target/x86_64-unknown-linux-gnu/debug/hello
        linux-vdso.so.1 (0x00007fff58bf4000)
        libdl.so.2 => /usr/x86_64-pc-linux-gnu/lib/libdl.so.2 (0x00007fc4b2d3f000)
        libpthread.so.0 => /usr/x86_64-pc-linux-gnu/lib/libpthread.so.0 (0x00007fc4b2b22000)
        libgcc_s.so.1 => /usr/x86_64-pc-linux-gnu/lib/libgcc_s.so.1 (0x00007fc4b290c000)
        libc.so.6 => /usr/x86_64-pc-linux-gnu/lib/libc.so.6 (0x00007fc4b2568000)
        /usr/x86_64-pc-linux-gnu/lib/ld-linux-x86-64.so.2 (0x00007fc4b2f43000)
        libm.so.6 => /usr/x86_64-pc-linux-gnu/lib/libm.so.6 (0x00007fc4b2272000)

To produce statically linked binaries, Rust provides two targets: x86_64-unknown-linux-musl and i686-unknown-linux-musl. The binaries produced for these targets are statically linked to the MUSL C library. Example below:

$ cargo new --bin hello
$ cd hello
$ rustup target add x86_64-unknown-linux-musl
$ cargo build --target x86_64-unknown-linux-musl
$ file target/x86_64-unknown-linux-musl/debug/hello
target/x86_64-unknown-linux-musl/debug/hello: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked, BuildID[sha1]=759d41b9a78d86bff9b6529d12c8fd6b934c0088, not stripped
$ ldd target/x86_64-unknown-linux-musl/debug/hello
        not a dynamic executable