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improve docker cross-compilation

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* support cross-compiling an x86-64 target on an arm64 host. This
  it turns out is a matter of *removing* an unnecessary dependency.
  (aarch64-linux-gnu-pkg-config exists but x86_64-linux-gnu-pkg-config
  doesn't. Turns out neither is necessary.) Added a comment explaining
  where ${gcc_target}-pkg-config comes from now.
* documentation tweaks
* improve debug output a bit
This commit is contained in:
Scott Lamb
2023-01-10 21:03:01 -08:00
parent 58e19265ef
commit 6ed23e90e8
7 changed files with 32 additions and 27 deletions
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10
guide/build.md
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@@ -114,8 +114,11 @@ caveats:
On Linux hosts (as opposed to when using Docker Desktop on macOS/Windows),
you'll likely see errors like the ones below. The solution is to [install
emulators](https://github.com/tonistiigi/binfmt#installing-emulators).
You may need to reinstall emulators on each boot of the host.
```
Exec format error
Error while loading /usr/sbin/dpkg-split: No such file or directory
Error while loading /usr/sbin/dpkg-deb: No such file or directory
```
@@ -127,7 +130,7 @@ Moonfire NVR's `Dockerfile` has some built-in debugging tools:
info includes:
* output (stdout + stderr) from the build script, running long operations
through the `time` command.
* `ls -laFR` of cache mounts before and after.
* `find -ls` output on cache mounts before and after.
* Each stage accepts a `INVALIDATE_CACHE_<stage>` argument. You can use eg
`--build-arg=INVALIDATE_CACHE_BUILD_SERVER=$(date +%s)` to force the
`build-server` stage to be rebuilt rather than use cached Docker layers.
@@ -191,8 +194,9 @@ $ sudo apt-get install \
tzdata
```
Ubuntu 20.04 (the latest LTS as of this writing) bundles node 10, which has
reached end-of-life (see [node.js: releases](https://nodejs.org/en/about/releases/)).
Ubuntu 20.04 LTS (still popular, supported by Ubuntu until April 2025) bundles
node 10, which has reached end-of-life (see
[node.js: releases](https://nodejs.org/en/about/releases/)).
So rather than install the `nodejs` and `npm` packages from the built-in
repository, see [Installing Node.js via package
manager](https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions).