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86 lines
2.8 KiB
Markdown
86 lines
2.8 KiB
Markdown
# V Cross-compilation Example
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This example shows how to build statically linked binaries for different OS
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and platforms for [V](https://vlang.io) programs.
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The build is performed by the make.vsh script in V. I think it could be
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simplified further, but the current version LGTM. Please read the comments
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inside make.vsh for details.
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The build is done inside a docker container with Debian 13 Trixie. Host is
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`x86_64` Linux.
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Produced binaries:
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* Linux: `amd64`, `arm64`, `arm32` (`armhf`), `ppc64le`, `s390x`, `riscv64`
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* Windows: `amd64`
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* FreeBSD: `amd64`
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The example programm is just `Hello World!`. For complex programs you may need
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to add more dependencies in build container.
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I relied on Debian's excellent cross-compilation support (see the Dockerfile),
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but with some elbow grease, you can compile the program for other architectures
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and operating systems.
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Build:
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```
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docker build . -t vlang-cross:latest-trixie
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```
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The container image is large (almost 3GiB) due to the number of libraries
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required for cross-compilation. The size could actually be reduced, but that's
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what Debian provides by default in the `crossbuild-essential-*` packages. For
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the same reason, building the image isn't very fast (up to ~3 minutes for me).
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Start cross-compilation:
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```
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docker run --rm -v .:/app vlang-cross:latest-trixie env DEBUG=1 ./make.vsh
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```
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then look inside `release/` dir (:
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## Synopsis
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You can run the make.vsh script in two ways:
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```
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./make.vsh
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# or
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v run make.vsh
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```
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```
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Build script options:
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-tasks List available tasks.
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-help Print this help message and exit. Aliases: help, --help.
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Build can be configured throught environment variables:
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BUILD_PROG_NAME Name of the compiled program. By default the name is
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parsed from v.mod.
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BUILD_PROG_VERSION Version of the compiled program. By default the name
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is parsed from v.mod.
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BUILD_PROG_ENTRYPOINT The program entrypoint. Defaults to '.' (current dir).
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BUILD_OUTPUT_DIR The directory where the build artifacts will be placed.
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Defaults to './release'.
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BUILD_SKIP_TARGETS List of build targets to skip. Expects comma-separated
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list without whitespaces e.g. 'windows-amd64,linux-armhf'
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BUILD_COMMON_VFLAGS The list of V flags is common for all targets. Expects
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comma-separated list. Default is '-prod,-cross'.
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BUILD_COMMON_CFLAGS Same as BUILD_COMMON_VFLAGS, but passed to underlying
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C compiler. Default is '-static'.
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DEBUG If set enables the verbose output as dimmed text.
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```
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## See Also
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* `v help build`
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* `v help build-c`
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* https://docs.vlang.io/cross-compilation.html
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* https://wiki.debian.org/CrossCompiling
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* https://en.wikipedia.org/wiki/Cross_compiler#GCC_and_cross_compilation
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* https://clang.llvm.org/docs/CrossCompilation.html
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