[Bug gas/25611] [DWARF-5] support for checksums in .file directives

[ndesaulniers at google dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25611

--- Comment #1 from Nick Desaulniers <ndesaulniers at google dot com> ---
Pawing more through the spec (previously linked), it looks like "1.4 Changes
from Version 4 to Version 5" on pdf pg 26 kind of hints at this:

20 • Replace the line number program header format with a new format that
21 provides the ability to use an MD5 hash to validate the source file version
in
22 use, allows pooling of directory and file name strings and makes provision
23 for vendor-defined extensions. Also add a string section specific to the
line
24 number table (.debug_line_str) to properly support the common practice
25 of stripping all DWARF sections except for line number information.

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