commit fe9f98f141d3a3bfbf0359f033d5b26542ecc0f2
author Martin Storsjo <martin@martin.st> Fri Sep 21 22:01:06 2018 +0000
committer Martin Storsjo <martin@martin.st> Fri Sep 21 22:01:06 2018 +0000
tree 3b0582d4ec422a5822cfd474e4f7247f693e7f69
parent 1d58e6ba79b446968de33905f7444b65c6eb314b

[COFF] Support linking to import libraries from GNU binutils

GNU binutils import libraries aren't the same kind of short import
libraries as link.exe and LLD produce, but are a plain static library
containing .idata section chunks. MSVC link.exe can successfully link
to them.

In order for imports from GNU import libraries to mix properly with the
normal import chunks, the chunks from the existing mechanism needs to
be added into named sections like .idata$2.

These GNU import libraries consist of one header object, a number of
object files, one for each imported function/variable, and one trailer.
Within the import libraries, the object files are ordered alphabetically
in this order. The chunks stemming from these libraries have to be
grouped by what library they originate from and sorted, to make sure
the section chunks for headers and trailers for the lists are ordered
as intended. This is done on all sections named .idata$*, before adding
the synthesized chunks to them.

Differential Revision: https://reviews.llvm.org/D38513

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@342777 91177308-0d34-0410-b5e6-96231b3b80d8