52 lines
1.8 KiB
Markdown
52 lines
1.8 KiB
Markdown
Cross Compilation for ARM on Linux
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==================================
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Through cross compilation, on Linux it is possible to build CoreCLR for arm or arm64.
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Requirements
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------------
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You need a Debian based host and the following packages needs to be installed:
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$ sudo apt-get install qemu qemu-user-static binfmt-support debootstrap
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In addition, to cross compile CoreCLR the binutils for the target are required. So for arm you need:
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$ sudo apt-get install binutils-arm-linux-gnueabihf
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and conversely for arm64:
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$ sudo apt-get install binutils-aarch64-linux-gnu
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Generating the rootfs
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---------------------
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The `cross\build-rootfs.sh` script can be used to download the files needed for cross compilation. It will generate an Ubuntu 14.04 rootfs as this is what CoreCLR targets.
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Usage: build-rootfs.sh [BuildArch]
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BuildArch can be: arm, arm64
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The `build-rootfs.sh` script must be run as root as it has to make some symlinks to the system, it will by default generate the rootfs in `cross\rootfs\<BuildArch>` however this can be changed by setting the `ROOTFS_DIR` environment variable.
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For example, to generate an arm rootfs:
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$ sudo ./cross/build-rootfs.sh arm
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and if you wanted to generate the rootfs elsewhere:
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$ sudo ROOTFS_DIR=~/coreclr-cross/arm ./build-rootfs.sh arm
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Cross compiling CoreCLR
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-----------------------
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Once the rootfs has been generated, it will be possible to cross compile CoreCLR. If `ROOTFS_DIR` was set when generating the rootfs, then it must also be set when running `build.sh`.
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So, without `ROOTFS_DIR`:
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$ ./build.sh arm debug verbose clean cross
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And with:
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$ ROOTFS_DIR=~/coreclr-cross/arm ./build.sh arm debug verbose clean cross
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As usual the resulting binaries will be found in `bin/Product/BuildOS.BuildArch.BuildType/`
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