[Bug binutils/29397] New: binutils: support zstd

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=29397

            Bug ID: 29397
           Summary: binutils: support zstd
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

Zstandard is a "universal" compression algorithm which scales from
low-ratio-very-fast to high-ratio-pretty-slow.
The generic-abi proposal https://groups.google.com/g/generic-abi/c/satyPkuMisk
("Add new ch_type value: ELFCOMPRESS_ZSTD") has been approved.

The default zstd -3 is easily 7x as fast as zlib level 1 while having a higher
compression ratio.

See also https://sourceware.org/pipermail/gnu-gabi/2022q2/000498.html

binutils may need to:

* optional: import zstd/ as a toplevel directory like zlib/
* add configure.ac option --with-system-zstd
* gas: add --compress-debug-sections=zstd
* objcopy: add --compress-debug-sections=zstd
* ld: support ELFCOMPRESS_ZSTD input, add --compress-debug-sections=zstd

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