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

Rui Ueyama via llvm-dev llvm-dev at lists.llvm.org
Wed Aug 12 22:19:18 PDT 2015

The header of libuser32b.a says that it defines MessageBoxB and
__imp_MessageBoxB, but the import library file in the archive actually
defines MessageBoxA (not B). So the archive file is broken. You may want to
fix the header and try again.

On Thu, Aug 13, 2015 at 2:04 PM, Martell Malone <martellmalone at gmail.com>

> 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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