[llvm-dev] [lld] Alias in COFF short import library.

[Martell Malone via llvm-dev]

Hi Rui,

I have finished my tool to generate short import libs for mingw-w64.

It works fine with lld for actual symbols.
But it seems lld segfaults when I try to use and an alias as we discussed
before.

I have attached 3 import libraries.
They all only have 1 import function.

libuser32orig.a -> Works fine and only has MessageBoxA

libuser32b.a -> the symbol table has MessageBoxB and __imp_MessageBoxB but
the Import object has MessageBoxA.user32.dll.

This causes a segfault in lld but should link correctly right ?

Additionally I have attached libuser32.a
This is the same as libuser32b.a but the symbol table has MessageBoxA and
__imp_MessageBoxB rather then MessageBoxB and __imp_MessageBoxB

This also segfaults I assume due to the same bug.

The reason I created this iteration is because we should be able to in the
import library just add extra __imp_{alias} to the symbol tables that point
to the original import of MessageBoxA.

Other then alias support the only difference between my new tool and
lib.exe is that I don't bother to create .debug sections as we don't need
them.

Kind Regards
Martell
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