Building only cross-compiler with aports/scripts/bootstrap.sh
This is a suggestion to add a flag to bootstrap.sh that allows for building only the cross-compiler packages that are required when cross-compiling with abuild.
Running ./bootstrap.sh arm will build the correct cross-compiler
packages, but also the entire Alpine base system for arm, which is
unnecessary for just building a custom kernel or package for e.g a
Raspberry Pi
(from redmine: issue id 10038, created on 2019-02-28)
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