Update ARM build docs #723
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Signed-off-by: Rune Soerensen <[email protected]>
Signed-off-by: Rune Soerensen <[email protected]>
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| If you want to build an ARM64 image from a different host architecture, you can use the arch-specific builder tag: `heroku/builder:24_linux-arm64`: | ||
| If you want to build an ARM64 image from a different host architecture, use the `--platform` parameter: |
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Does building a linux/arm64 image on a linux/amd64 host would require some form of arm64 emulator? I know we can assemble the images. But does building work in the general case? For example, if I'm building a Python application that, in turn, needs to compile a C library?
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If I understand you correctly, I think the answer to both your questions is yes -- building an linux/arm64 image on a linux/amd64 host does require an emulator capable of emulating/virtualizing a different architecture (like Docker :)), and building should generally work - also if a user needs to compile a C library.
Running pack build with the --builder heroku/builder:24 --platform linux/arm64 parameters is equivalent to using the arch-specific heroku/builder:24_linux-arm64 builder tag currently in the docs, and the builder will be the same either way.
However, the only reason to use --builder heroku/builder:24_linux-arm64 (and the reason we added arch-specific tags) was that pack build didn't allow specifying a --platform for multi-arch builders until just recently. It was a bit of a hack which, since the introduction of pack v0.34.0, is fortunately no longer necessary! :)
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Ah great. I'll land this. But it would be also nice to have a list of builders that support ARM in this doc (simply because ARM support is still a little rare).
* Update build-for-arm.md Signed-off-by: Rune Soerensen <[email protected]> * Add PHP to list of buildpacks Signed-off-by: Rune Soerensen <[email protected]> --------- Signed-off-by: Rune Soerensen <[email protected]> Co-authored-by: Aidan Delaney <[email protected]>
* Update build-for-arm.md Signed-off-by: Rune Soerensen <[email protected]> * Add PHP to list of buildpacks Signed-off-by: Rune Soerensen <[email protected]> --------- Signed-off-by: Rune Soerensen <[email protected]> Co-authored-by: Aidan Delaney <[email protected]> Signed-off-by: Aidan Delaney <[email protected]>
Updating the ARM build docs to reflect
pack build --platformsupport introduced inpack v0.34.0.