[Bug ld/25806] [ld] Search for input files relative to the current linker script

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=25806

--- Comment #1 from Fangrui Song <i at maskray dot me> ---
I made some investigations.

Notation: CWD => current working directory
For a relative pathname (not absolute path or -l) in INPUT() or GROUP():

* GNU ld searches in CWD then in -L
* gold searches in the parent directory of the current linker script then in
-L.
  It does not fall back to CWD.

I am going to change the search order of lld

* the parent directory of the current linker script
* next in CWD
* then in -L.

https://reviews.llvm.org/D77779

libstdc++.a currently includes object files from libsupc++. It could use a
linker script as an alternative if GNU ld had this feature... Though there is
probably no point to do this

For libc++.a, it probably makes more sense because several C++ ABI libraries
can be plugged in.

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