[Bug 9686] New: x64+arm64 fatbinary

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9686

            Bug ID: 9686
           Summary: x64+arm64 fatbinary
           Product: Busybox
           Version: unspecified
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: mike at michaellawrenceit.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Blocker for me , as the docker-build collapses..

anyhow is thier a way to build amd64+arm64 binary.. 

qemu and proot static in their would be also nice to haves , however have good
static source. for overall emulation ie gentoo-arm64 emerge package on amd64
docker hosts...  

bash dies in docker from the initial base , so scripts die... not fun, but via
busy box i could continue to run them ie bb-bash , then invoke emulator. etc.
set as entry point.. etc.. 

/busybox/bash run ./proot -R /... -q umeq /bin/bash (Debian dev has umeq a
hacked qemu static build on github and a hacked proot static. ) 


for now if you can I was hoping for some info to build a fat bin for
amd64-arm64 for cross building... via docker container. 
I can build on my local machine etc. 


also might be a plus to having a multi-arch-fat-binary docker container aimed
at cross builders. thus can run a native bash on host mode cpu if docker build
dies to soon. quay.io is far more patient. however , dockerhub is less... 
I just get stiffed by about 30-40 seconds ... before i can set up a few more
scripts and symlinks using from scratch... 


https://github.com/gentoo/gentoo-docker-images/blob/master/amd64/

uses busybox to set up for now been using scratch , however more work and
upkeep. but ruining the build.sh , means as the base tarball updates , so too
dose the build. 

A: use emulation (for now far more likely) 
B: if lucky has arm64 server with docker etc... 

busybox base , and /busyboy to call native bash latter , failsafe buys time.. 
add a few symlinks add a few binfmt files etc. 


anyhow , any tips one could have I'll take, on making a fat binary.. to cover
multiple use scenarios ... 

if they added qemu static proot binfmt misc etc to busybox that would be
dead-sexy in the future.

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