[llvm-dev] lld on Windows

[Russell Wallace via llvm-dev]

Ah! I don't know what GUARDSYM does or whether there is any way to turn it
off at the compiler end; a Google search doesn't seem to find anything; but
it would be great if you could add support for msvc 2015.

When I try using clang as the compiler, I get a different error message. In
this case it seems to be just not finding the standard libraries?

C:\t>clang -c a.c

C:\t>lld -flavor link a.o
Undefined symbol: <entry>: mainCRTStartup
Undefined symbol: a.o: puts
symbol(s) not found

On Thu, Sep 3, 2015 at 4:59 PM, Rui Ueyama <ruiu at google.com> wrote:

> You seems to be using MSVC 2015 which I don't use yet, and /GUARDSYM seems
> to be a new option added in MSVC 2015. I'll try to support that.
>
> On Fri, Sep 4, 2015 at 12:56 AM, Russell Wallace <
> russell.wallace at gmail.com> wrote:
>
>> C:\t>type a.c
>> #include <stdio.h>
>>
>> int main() {
>>   puts("hello");
>>   return 0;
>> }
>>
>> C:\t>cl /c a.c
>> Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23026 for x64
>> Copyright (C) Microsoft Corporation.  All rights reserved.
>>
>> a.c
>>
>> C:\t>lld
>> Select the appropriate flavor
>> OVERVIEW: LLVM Linker
>>
>> USAGE: lld [options] <inputs>
>>
>> OPTIONS:
>>   -core           CORE linking
>>   -flavor <value> Flavor for linking, options are gnu/darwin/link
>>   -help           Display this help message
>>   -target <value> Select the target
>>   -version        Display the version
>>
>> C:\t>lld -flavor link a.obj
>> Cannot open /GUARDSYM:__C_specific_handler,S.obj: no such file or
>> directory
>>
>> On Thu, Sep 3, 2015 at 4:45 PM, Rui Ueyama <ruiu at google.com> wrote:
>>
>>> What error message did you get? What
>>> http://lld.llvm.org/windows_support.html says is correct -- except
>>> debug info, the linker should be pretty much usable as a drop-in
>>> replacement for MSVC linker.
>>>
>>> On Thu, Sep 3, 2015 at 5:11 PM, Russell Wallace via llvm-dev <
>>> llvm-dev at lists.llvm.org> wrote:
>>>
>>>> What's the current state of affairs regarding lld on Windows - how much
>>>> of it is supposed to work? The documentation at
>>>> http://lld.llvm.org/windows_support.html suggests it should pretty
>>>> much work provided you don't need exceptions or debug info (though that
>>>> documentation seems to be from last year), but when I tried it on a 'hello
>>>> world' C program, it gave error messages; is it the case that lld is not
>>>> yet expected to work on Windows, or that it should and I'm probably getting
>>>> a command wrong, or something else?
>>>>
>>>> _______________________________________________
>>>> LLVM Developers mailing list
>>>> llvm-dev at lists.llvm.org
>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>>
>>>>
>>>
>>
>
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