[Bug ld/28040] New: libLLVM.so fails to link using LTO with ld.bfd + LLVMGold plugin

[tbaeder at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28040

            Bug ID: 28040
           Summary: libLLVM.so fails to link using LTO with ld.bfd +
                    LLVMGold plugin
           Product: binutils
           Version: 2.37 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: tbaeder at redhat dot com
  Target Milestone: ---

This is a forward of https://bugzilla.redhat.com/show_bug.cgi?id=1954375
and https://reviews.llvm.org/D104230

ld.bfd (or rather libbfd I think) creates tons of fds and passes them to the
claim_file() callback that ld plugins implement. This is the case for archives
as far as I can see.

ld does not close the fd after the claim_file() callback has been called when
the LLVM plugin is in use, but does close them when the gcc plugin is used
(there is a comment about this in ld/plugin.c.

Simply removing that comment and the surrounding if statement fixed the problem
for me. Explicitly calling release_input_file() in LLVM's claim_file
implementation also worked for me.

I don't have a smaller test case for this unfortunately.

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