Update ARM build docs #723
Conversation
Signed-off-by: Rune Soerensen <rsoerensen@salesforce.com>
Signed-off-by: Rune Soerensen <rsoerensen@salesforce.com>
|
|
||
| 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: |
There was a problem hiding this comment.
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?
There was a problem hiding this comment.
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! :)
There was a problem hiding this comment.
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 <rsoerensen@salesforce.com> * Add PHP to list of buildpacks Signed-off-by: Rune Soerensen <rsoerensen@salesforce.com> --------- Signed-off-by: Rune Soerensen <rsoerensen@salesforce.com> Co-authored-by: Aidan Delaney <adelaney21@bloomberg.net>
* Update build-for-arm.md Signed-off-by: Rune Soerensen <rsoerensen@salesforce.com> * Add PHP to list of buildpacks Signed-off-by: Rune Soerensen <rsoerensen@salesforce.com> --------- Signed-off-by: Rune Soerensen <rsoerensen@salesforce.com> Co-authored-by: Aidan Delaney <adelaney21@bloomberg.net> Signed-off-by: Aidan Delaney <adelaney21@bloomberg.net>
Updating the ARM build docs to reflect
pack build --platformsupport introduced inpack v0.34.0.