[PATCH] D148859: [ELF] Add --remap-inputs-file=

[Fangrui Song via Phabricator via llvm-commits]

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--remap-inputs-file= can be specified multiple times, each naming a
remap file that contains `from-glob<tab>to-file` lines or `#`-led comments.
This option can be used to:

- replace an input file. E.g. `"*/libz.so\texp/libz.so"` can replace a resolved `-lz` without updating the input file list or (if used) a response file. When debugging an application where a bug is isolated to one single input file, this option gives an convenient way to test fixes.
- remove an input file with `/dev/null` (changed to `NUL` on Windows), e.g. `"a.o\t/dev/null"`. A build system may add unneeded dependencies. This option gives an convenient way to test the result removing some inputs.

bash/zsh process substitution is handy for specifying a pattern without using
a remap file, e.g. `--remap-inputs-file=<(printf 'a.o\taa.o')`

Exact patterns are tested before wildcard patterns. In case of a tie, the first
patterns wins. This is an implementation detail that users should not rely on.

Co-authored-by: Marco Elver <elver at google.com>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148859

Files:
  lld/ELF/Config.h
  lld/ELF/Driver.cpp
  lld/ELF/DriverUtils.cpp
  lld/ELF/InputFiles.cpp
  lld/ELF/Options.td
  lld/docs/ld.lld.1
  lld/test/ELF/remap-inputs-file.test

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