[Bug ld/27407] Add --trace-symbols-from-file?

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=27407

--- Comment #2 from Fangrui Song <i at maskray dot me> ---
Yes, response files are accepted by many llvm-project tools. You reminded me
that we can compose tools, e.g.

ld.bfd @response.txt $(nm -Du usr/lib64/libc.so.6 | awk '{print
"-y"substr($0,20)}')

For object files, -D probably should be changed to -g.
There is some flexibility composing can provide: nm -u can be changed to
--defined-only to trace only defined symbols.

So it is unnecessary for ld to support such file tracing features.

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