[Bug ld/30374] New: ld: Add --remap-inputs-file= to remap input files

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=30374

            Bug ID: 30374
           Summary: ld: Add --remap-inputs-file= to remap input files
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

Hello! I'm considering an option in ld.lld to replace or remove input files
with glob patterns. https://reviews.llvm.org/D148859

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

aa.o    a.o
b?.[b]c b.o
cc.a    c.a
d*.so   d.so
## Use /dev/null to indicate an input file which should be ignored. /dev/null
is treated as an empty linker script.
empty   /dev/null


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')

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