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

[Martell Malone via llvm-dev]

>
> 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.

Yes this is how I done the alias.

If you consider this invalid then look at libuser32.a
The header defines MessageBoxA and __imp_MessageBoxB.
This should be valid yes ?


On Thu, Aug 13, 2015 at 6:19 AM, Rui Ueyama <ruiu at google.com> wrote:

> 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>
> wrote:
>
>> 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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