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480 lines
23 KiB
Markdown
480 lines
23 KiB
Markdown
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# dockcross
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Cross compiling toolchains in Docker images.
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[](https://github.com/dockcross/dockcross/actions?query=branch%3Amaster) [](https://github.com/dockcross/dockcross/actions/workflows/shellcheck.yml)
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## Features
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- Pre-built and configured toolchains for cross compiling.
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- Most images also contain an emulator for the target system.
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- Clean separation of build tools, source code, and build artifacts.
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- Commands in the container are run as the calling user, so that any created files have the expected ownership, (i.e. not root).
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- Make variables **CC**, **CXX**, **LD**, **AS** etc) are set to point to the appropriate tools in the container.
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- Recent [CMake](https://cmake.org) and ninja are precompiled.
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- [Conan.io](https://www.conan.io) can be used as a package manager.
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- Toolchain files configured for CMake.
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- Current directory is mounted as the container\'s workdir, `/work`.
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- Works with the [Docker for Mac](https://docs.docker.com/docker-for-mac/) and [Docker for Windows](https://docs.docker.com/docker-for-windows/).
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- Support using alternative container executor by setting **OCI_EXE** environment variable. By default, it searches for [docker](https://www.docker.com) and [podman](https://podman.io) executable.
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- [crosstool-ng](https://github.com/crosstool-ng/crosstool-ng) and [buildroot](https://github.com/buildroot/buildroot) configuration files.
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## Examples
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1. `dockcross make`: Build the *Makefile* in the current directory.
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2. `dockcross cmake -Bbuild -H. -GNinja`: Run CMake with a build directory `./build` for a *CMakeLists.txt* file in the current directory and generate `ninja` build configuration files.
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3. `dockcross ninja -Cbuild`: Run ninja in the `./build` directory.
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4. `dockcross bash -c '$CC test/C/hello.c -o hello'`: Build the *hello.c* file with the compiler identified with the `CC` environmental variable in the build environment.
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5. `dockcross bash`: Run an interactive shell in the build environment.
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Note that commands are executed verbatim. If any shell processing for environment variable expansion or redirection is required, please use
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```bash
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bash -c "<command args>"
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```
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## Installation
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This image does not need to be run manually. Instead, there is a helper script to execute build commands on source code existing on the local host filesystem. This script is bundled with the image.
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To install the helper script, run one of the images with no arguments, and redirect the output to a file:
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```bash
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docker run --rm CROSS_COMPILER_IMAGE_NAME > ./dockcross
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chmod +x ./dockcross
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mv ./dockcross ~/bin/
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```
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Where **CROSS_COMPILER_IMAGE_NAME** is the name of the cross-compiler toolchain Docker instance, e.g: **dockcross/linux-armv7**.
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Only 64-bit x86_64 images are provided, a 64-bit x86_64 host system is required.
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## Usage
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For the impatient, here\'s how to compile a hello world for armv7:
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```bash
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cd ~/src/dockcross
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docker run --rm dockcross/linux-armv7 > ./dockcross-linux-armv7
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chmod +x ./dockcross-linux-armv7
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./dockcross-linux-armv7 bash -c '$CC test/C/hello.c -o hello_arm'
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```
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Note how invoking any toolchain command (make, gcc, etc.) is just a matter of prepending the **dockcross** script on the commandline:
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```bash
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./dockcross-linux-armv7 [command] [args...]
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```
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The dockcross script will execute the given command-line inside the container, along with all arguments passed after the command. Commands that evaluate environmental variables in the image, like **$CC** or **$CXX** above, should be executed in [bash -c]. The present working directory is mounted within the image, which can be used to make source code available in the Docker container.
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## Summary cross compilers
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| Image name | Target arch | Compiler | Target OS |
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|:-------:|:--------:|:------:|:-----:|
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| dockcross/base | - | - | - |
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| dockcross/android-arm | ARMv7 | Clang | Android |
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| dockcross/android-arm64 | ARMv8 | Clang | Android |
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| dockcross/android-x86 | x86 | Clang | Android |
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| dockcross/android-x86_64 | x86_64 | Clang | Android |
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| dockcross/linux-arm64 | ARMv8 | GCC | Linux |
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| dockcross/linux-arm64-full | ARMv8 | GCC | Linux |
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| dockcross/linux-arm64-musl | ARMv8 | GCC + musl | Linux |
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| dockcross/linux-armv5 | ARMv5 | GCC | Linux |
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| dockcross/linux-armv5-musl | ARMv5 | GCC + musl | Linux |
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| dockcross/linux-armv6 | ARMv6 | GCC | Linux |
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| dockcross/linux-armv6-lts | ARMv6 | GCC + Glibc 2.28 | Linux |
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| dockcross/linux-armv6-musl | ARMv6 | GCC + musl | Linux |
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| dockcross/linux-armv7 | ARMv7 | GCC | Linux |
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| dockcross/linux-armv7a | ARMv7a | GCC | Linux |
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| dockcross/linux-armv7l-musl | ARMv7l | GCC + musl | Linux |
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| dockcross/linux-mips | mips | GCC | Linux |
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| dockcross/linux-s390x | s390x | GCC | Linux |
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| dockcross/linux-ppc64le | ppc64le | GCC | Linux |
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| dockcross/linux-riscv32 | riscv32 | GCC | Linux |
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| dockcross/linux-riscv64 | riscv64 | GCC | Linux |
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| dockcross/linux-m68k-uclibc | m68k | GCC + uclibc | Linux |
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| dockcross/linux-xtensa-uclibc | xtensa | GCC + uclibc | Linux |
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| dockcross/manylinux2014-x86 | x86 | GCC | Linux |
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| dockcross/manylinux2014-x64 | x86_64 | GCC | Linux |
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| dockcross/linux-x86 | x86 | GCC | Linux |
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| dockcross/linux-x64 | x86_64 | GCC | Linux |
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| dockcross/linux-x64-clang | x86_64 | Clang | Linux |
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| dockcross/web-wasm | JS | LLVM | Web (JS) |
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| dockcross/windows-shared-x86 | x86 | GCC | Windows |
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| dockcross/windows-shared-x64 | x86_64 | GCC | Windows |
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| dockcross/windows-shared-x64-posix | x86_64 | GCC | Windows |
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| dockcross/windows-static-x86 | x86 | GCC | Windows |
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| dockcross/windows-static-x64 | x86_64 | GCC | Windows |
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| dockcross/windows-static-x64-posix | x86_64 | GCC | Windows |
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| dockcross/windows-armv7 | ARMv7 | Clang | Windows |
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| dockcross/windows-arm64 | ARMv8 | Clang | Windows |
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## Cross compilers
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### dockcross/base
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Base image for other toolchain images. From Debian Jessie with GCC, make, autotools, CMake, Ninja, Git, and Python.
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### dockcross/android-arm
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The Android NDK standalone toolchain for the arm architecture.
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### dockcross/android-arm64
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The Android NDK standalone toolchain for the arm64 architecture.
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### dockcross/android-x86
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The Android NDK standalone toolchain for the x86 architecture.
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### dockcross/android-x86_64
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The Android NDK standalone toolchain for the x86_64 architecture.
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### dockcross/linux-arm64
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Cross compiler for the 64-bit ARM platform on Linux, also known as AArch64.
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### dockcross/linux-arm64-full
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Cross compiler for the 64-bit ARM platform on Linux, with cross-libs: SDL2, OpenSSL, Boost, OpenCV and Qt5 (minimal).
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### dockcross/linux-arm64-musl
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Cross compiler for the 64-bit ARM platform on Linux (also known as
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AArch64), using [musl](https://www.musl-libc.org/) as base \"libc\".
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### dockcross/linux-armv5
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Linux armv5 cross compiler toolchain for legacy devices like the
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Parrot AR Drone.
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### dockcross/linux-armv5-musl
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Linux armv5 cross compiler toolchain using
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[musl](https://www.musl-libc.org/) as base \"libc\".
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### dockcross/linux-armv6
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Linux ARMv6 cross compiler toolchain for the Raspberry Pi
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### dockcross/linux-armv6-lts
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Linux ARMv6 cross compiler toolchain for the Raspberry Pi (Debian buster...)
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### dockcross/linux-armv6-musl
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Linux ARMv6 cross compiler toolchain for the Raspberry Pi, etc,
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using [musl](https://www.musl-libc.org/) as base \"libc\".
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### dockcross/linux-armv7
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Generic Linux armv7 cross compiler toolchain.
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### dockcross/linux-armv7a
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Toolchain configured for ARMv7-A used in Beaglebone Black single
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board PC with TI SoC AM3358 on board, Cortex-A8.
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### dockcross/linux-armv7l-musl
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Toolchain configured for ARMv7-L, using
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[musl](https://www.musl-libc.org/) as base \"libc\".
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### dockcross/linux-mips
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Linux mips cross compiler toolchain for big endian 32-bit hard float
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MIPS GNU systems.
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### dockcross/linux-s390x
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Linux s390x cross compiler toolchain for S390X GNU systems.
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### dockcross/linux-riscv64
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Linux risc-v 64bit cross compiler toolchain for risc-v 64bit GNU systems.
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### dockcross/linux-riscv32
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Linux risc-v 32bit cross compiler toolchain for risc-v 32bit GNU systems.
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### dockcross/linux-m68k-uclibc
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Linux m68k cross compiler toolchain for m68k GNU systems (http://www.mac.linux-m68k.org/ and http://www.linux-m68k.org/).
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### dockcross/linux-ppc64le
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Linux PowerPC 64 little endian cross compiler toolchain for the POWER8, etc. Important: Due to Issue #430, automatic build of newer images has been disabled.
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### dockcross/linux-x64
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Linux x86_64/amd64 compiler. Since the Docker image is natively x86_64, this is not actually a cross compiler.
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### dockcross/linux-x64-clang
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Linux clang x86_64/amd64 compiler. Since the Docker image is natively x86_64, this is not actually a cross compiler.
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### dockcross/linux-x86
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Linux i686 cross compiler.
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### dockcross/manylinux2014-x64
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Docker [manylinux2014](https://github.com/pypa/manylinux) image for building Linux x86_64 / amd64 [Python wheel packages](http://pythonwheels.com/). It includes Python 3.5, 3.6, 3.7, 3.8, and 3.9. Also has support for the dockcross script, and it has installations of CMake, Ninja, and [scikit-build](http://scikit-build.org). For CMake, it sets **MANYLINUX2014** to \"TRUE\" in the toolchain.
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### dockcross/manylinux2014-x86
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Docker [manylinux2014](https://github.com/pypa/manylinux) image for building Linux i686 [Python wheel packages](http://pythonwheels.com/). It includes Python 3.5, 3.6, 3.7, 3.8, and 3.9. Also has support for the dockcross script, and it has installations of CMake, Ninja, and [scikit-build](http://scikit-build.org). For CMake, it sets **MANYLINUX2014** to \"TRUE\" in the toolchain.
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### dockcross/web-wasm
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The Emscripten WebAssembly/asm.js/JavaScript cross compiler.
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### dockcross/windows-static-x64
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64-bit Windows cross-compiler based on [MXE/MinGW-w64](https://mxe.cc/) with win32 threads and static
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linking.
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### dockcross/windows-static-x64-posix
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64-bit Windows cross-compiler based on [MXE/MinGW-w64](https://mxe.cc/) with posix threads and static
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linking.
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### dockcross/windows-static-x86
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32-bit Windows cross-compiler based on [MXE/MinGW-w64](https://mxe.cc/) with win32 threads and static linking.
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### dockcross/windows-shared-x64
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64-bit Windows cross-compiler based on [MXE/MinGW-w64](https://mxe.cc/) with win32 threads and dynamic linking.
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### dockcross/windows-shared-x64-posix
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64-bit Windows cross-compiler based on [MXE/MinGW-w64](https://mxe.cc/) with posix threads and dynamic linking.
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### dockcross/windows-shared-x86
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32-bit Windows cross-compiler based on [MXE/MinGW-w64](https://mxe.cc/) with win32 threads and dynamic linking.
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### dockcross/windows-armv7
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ARMv7 32-bit Windows cross-compiler based on [LLVM/MinGW-w64](https://github.com/mstorsjo/llvm-mingw)
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### dockcross/windows-arm64
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ARMv8 64-bit Windows cross-compiler based on [llvm-mingw](https://github.com/mstorsjo/llvm-mingw)
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## Summary legacy cross compilers
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The list of docker images that are no longer supported or broken
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| Image name | Target arch | Compiler | Target OS |
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| dockcross/manylinux2014-aarch64 | ARMv8 | GCC 4.8 | manylinux |
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| dockcross/manylinux1-x86 | x86 | GCC | manylinux |
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| dockcross/manylinux1-x64 | x86_64 | GCC| manylinux |
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| dockcross/manylinux2010-x86 | x86 | GCC | manylinux |
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| dockcross/manylinux2010-x64 | x86_64 | GCC | manylinux |
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## Articles
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- [dockcross: C++ Write Once, Run
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Anywhere](https://nbviewer.jupyter.org/format/slides/github/dockcross/cxx-write-once-run-anywhere/blob/master/dockcross_CXX_Write_Once_Run_Anywhere.ipynb#/)
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- [Cross-compiling binaries for multiple architectures with
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Docker](https://web.archive.org/web/20170912153531/http://blogs.nopcode.org/brainstorm/2016/07/26/cross-compiling-with-docker)
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## Built-in update commands
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A special update command can be executed that will update the source
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cross-compiler Docker image or the dockcross script itself.
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- `dockcross [--] command [args...]`: Forces a command to run inside
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the container (in case of a name clash with a built-in command), use
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`--` before the command.
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- `dockcross update-image`: Fetch the latest version of the docker
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image.
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- `dockcross update-script`: Update the installed dockcross script
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with the one bundled in the image.
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- `dockcross update`: Update both the docker image, and the dockcross
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script.
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## Download all images
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To easily download all images, the convenience target `display_images`
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could be used:
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```bash
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curl https://raw.githubusercontent.com/dockcross/dockcross/master/Makefile -o dockcross-Makefile
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for image in $(make -f dockcross-Makefile display_images); do
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echo "Pulling dockcross/$image"
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docker pull dockcross/$image
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done
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```
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## Install all dockcross scripts
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To automatically install in `~/bin` the dockcross scripts for each
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images already downloaded, the convenience target `display_images` could
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be used:
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```bash
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curl https://raw.githubusercontent.com/dockcross/dockcross/master/Makefile -o dockcross-Makefile
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for image in $(make -f dockcross-Makefile display_images); do
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if [[ $(docker images -q dockcross/$image) == "" ]]; then
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echo "~/bin/dockcross-$image skipping: image not found locally"
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continue
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fi
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echo "~/bin/dockcross-$image ok"
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docker run dockcross/$image > ~/bin/dockcross-$image && \
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chmod u+x ~/bin/dockcross-$image
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done
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```
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## Dockcross configuration
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The following environmental variables and command-line options are used.
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In all cases, the command-line option overrides the environment
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variable.
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### DOCKCROSS_CONFIG / \--config\|-c \<path-to-config-file>
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This file is sourced, if it exists, before executing the rest of the
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dockcross script.
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Default: `~/.dockcross`
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### DOCKCROSS_IMAGE / \--image\|-i \<docker-image-name>
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The Docker cross-compiler image to run.
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Default: Image with which the script was created.
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### DOCKCROSS_ARGS / \--args\|-a \<docker-run-args>
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Extra arguments to pass to the `docker run` command. Quote the entire set of args if they contain spaces.
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## Per-project dockcross configuration
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If a shell script named `.dockcross` is found in the current directory where the dockcross script is started, it is executed before the dockcross script `command` argument. The shell script is expected to have a shebang like `#!/usr/bin/env bash`.
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For example, commands like
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`git config --global advice.detachedHead false` can be added to this
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script.
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## How to extend Dockcross images
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In order to extend Dockcross images with your own commands, one must:
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1. Use `FROM dockcross/<name_of_image>`.
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2. Set `DEFAULT_DOCKCROSS_IMAGE` to a name of the tag you\'re planning
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to use for the image. This tag must then be used during the build
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phase, unless you mean to pass the resulting helper script the
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`DOCKCROSS_IMAGE` argument.
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An example Dockerfile would be:
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```
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FROM dockcross/linux-armv7
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ENV DEFAULT_DOCKCROSS_IMAGE my_cool_image
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RUN apt-get install nano
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```
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And then in the shell:
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```
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docker build -t my_cool_image . ## Builds the dockcross image.
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docker run my_cool_image > linux-armv7 ## Creates a helper script named linux-armv7.
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chmod +x linux-armv7 ## Gives the script execution permission.
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./linux-armv7 bash ## Runs the helper script with the argument "bash", which starts an interactive container using your extended image.
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```
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## What is the difference between **dockcross** and **dockbuild** ?
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The key difference is that [dockbuild](https://github.com/dockbuild/dockbuild#readme) images do **NOT** provide a [toolchain file](https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html) but they use the same method to conveniently isolate the build environment as [dockcross](https://github.com/dockcross/dockcross#readme).
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**dockbuild** is used to build binaries for Linux x86_64/amd64 that will work across most Linux distributions.
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**dockbuild** performs a native Linux build where the host build system is a Linux x86_64 / amd64 Docker image (so that it can be used for building binaries on any system which can run Docker images) and the target runtime system is Linux x86_x64/ amd64.
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**dockcross** is used to build binaries for many different platforms. **dockcross** performs a cross compilation where the host build system is a Linux x86_64 / amd64 Docker image (so that it can be used for building binaries on any system which can run Docker images) and the target runtime system varies.
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\-\--
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Credits:
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- [sdt/docker-raspberry-pi-cross-compiler](https://github.com/sdt/docker-raspberry-pi-cross-compiler), who invented the base of the **dockcross** script.
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- [https://github.com/steeve/cross-compiler](https://github.com/steeve/cross-compiler),
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