To deploy the binary on the target we need a static build.
Install dependencies:
$ shards install --production
As the Crystal documentations says:
Building fully statically linked executables is currently only supported on Alpine Linux.
For that purpose, the documentation recommends using musl-libc:
Official Docker Images based on Alpine Linux are available on Docker Hub at crystallang/crystal. The latest release is tagged as crystallang/crystal:latest-alpine.
As an example replace the local build:
$ crystal build src/miniss.cr --release --static --no-debug -o bin/miniss
$ shards build --production --release --static --no-debug
with
$ docker run --rm -it -v $PWD:/workspace -w /workspace crystallang/crystal:1.12.1-alpine \
crystal build src/miniss.cr --release --static --no-debug -o bin/miniss
$ docker run --rm -it -v $PWD:/workspace -w /workspace crystallang/crystal:1.12.1-alpine \
shards build --production --release --static --no-debug
Since you are cross-compiling from a docker container, it would be wiser to ensure to provide the correct cross compilation flags.
Find your platform with llvm-config --host-target (examples: x86_64-pc-linux-gnu on a modern Linux host) on your host or the target (see platform support and LLVM - Cross-compilation using Clang).
So change from
$ crystal build src/miniss.cr --release --static --no-debug -o bin/miniss --cross-compile --target x86_64-pc-linux-gnu
$ cc bin/miniss.o -o bin/miniss -rdynamic -static --no-debug -L/home/noraj/.asdf/installs/crystal/1.12.1/bin/../lib/crystal -lpcre -lm -lgc -lpthread -levent -lrt -lpthread -ldl
to
$ docker run --rm -it -v $PWD:/workspace -w /workspace crystallang/crystal:1.12.1-alpine \
crystal build src/cli.cr --release --static --no-debug \
-o bin/miniss-x86_64-pc-linux-gnu --cross-compile --target x86_64-pc-linux-gnu
$ cc bin/miniss-x86_64-pc-linux-gnu.o -o bin/miniss-x86_64-pc-linux-gnu -rdynamic -static -L/usr/bin/../lib/crystal -lpcre -lm -lgc -lpthread -levent -lrt -lpthread -ldl
Note: the second line must be executed on the target platform.
Finally, check your binary is fully static:
$ ldd bin/miniss-x86_64-pc-linux-gnu
not a dynamic executable
If you like miniss very much and want to use it on your system as well.
Install dependencies:
$ shards install --production
Build:
$ crystal build src/miniss.cr --release --no-debug -o bin/miniss
$ shards build --production --release --no-debug
This we you can compile a pre-compiled object without needing Crystal, Docker or managing the dependencies.
cc miniss-x86_64-linux-gnu.o -o miniss-x86_64-linux-gnu -rdynamic -static -L/usr/lib/crystal -lpcre -lm -lgc -lpthread -levent -lrt -lpthread -ldl
cc miniss-aarch64-linux-gnu.o -o miniss-aarch64-linux-gnu -rdynamic -static -L/usr/lib/crystal -lpcre -lm -lgc -lpthread -levent -lrt -lpthread -ldl
cc miniss-aarch64-linux-musl.o -o miniss-aarch64-linux-musl -rdynamic -static -L/usr/lib/crystal -lpcre -lgc -levent
Dependencies Debian 11: apt install libpcre3-dev libgc-dev libevent-dev
cc miniss-arm-linux-gnueabihf.o -o miniss-arm-linux-gnueabihf -rdynamic -static -L/usr/lib/crystal -lpcre -lm -lgc -lpthread -levent -lpthread -ldl
cc miniss-i386-linux-gnu.o -o miniss-i386-linux-gnu -rdynamic -static -L/usr/lib/crystal -lpcre -lm -lgc -lpthread -levent -lrt -lpthread -ldl
cc miniss-i386-linux-musl.o -o miniss-i386-linux-musl -rdynamic -static -L/usr/lib/crystal -lpcre -lgc -levent
cc miniss-x86_64-linux-musl.o -o miniss-x86_64-linux-musl -rdynamic -static -L/usr/lib/crystal -lpcre -lgc -levent
cc miniss-x86_64-openbsd.o -o miniss-x86_64-openbsd -rdynamic -static -L/usr/lib/crystal -lpcre -lm -lgc -lpthread -levent_extra -levent_core -lc++abi -lpthread -liconv
cc miniss-x86_64-freebsd.o -o miniss-x86_64-freebsd -rdynamic -static -L/usr/lib/crystal -lpcre -lm -lgc-threaded -lpthread -levent -lpthread