[Bug 14761] New: commands using SET_PTR_TO_GLOBALS segfaults when compiled with clang 12.0.1

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=14761

            Bug ID: 14761
           Summary: commands using SET_PTR_TO_GLOBALS segfaults when
                    compiled with clang 12.0.1
           Product: Busybox
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: logoerthiner1 at 163.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Created attachment 9286
  --> https://bugs.busybox.net/attachment.cgi?id=9286&action=edit
.config file for reference; mostly defconfig with only tweaks in general config

I compiled busybox using clang (12.0.1, default version on alpine 3.15 amd64,
make CC=clang STRIP=llvm-strip) on aarch64 architecture, and then run it on
aarch64 linux kernel. Some of commands segfaults directly:
```
~ $ busybox getty
Segmentation fault
~ $ busybox vi
Segmentation fault
~ $ busybox awk
Segmentation fault
~ $ busybox ed   
Segmentation fault
~ $ busybox diff
Segmentation fault
~ $ busybox netstat
Segmentation fault
~ $ busybox wget
Segmentation fault
~ $ busybox ftpd
Segmentation fault
~ $ busybox httpd
Segmentation fault
~ $ busybox ntpd
~ $ busybox arping
Segmentation fault
```

I suspect SET_PTR_TO_GLOBALS is the culprit, since many commands using
SET_PTR_TO_GLOBALS does not work at all.

clang 12.0.1 may not respect "unconst" black magic in busybox.

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