[llvm-dev] lld on Windows

[Russell Wallace via llvm-dev]

C:\t>clang-cl /c a.c

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 5:08 PM, Rui Ueyama <ruiu at google.com> wrote:

> On Fri, Sep 4, 2015 at 1:06 AM, Russell Wallace <russell.wallace at gmail.com
> > wrote:
>
>> 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.
>>
>
> Yeah, there's no information about what /GUARDSYM option is on the
> internet. We may want to ignore the option for now.
>
>
>>
>> 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
>>
>
> Maybe you want to try to compile with clang-cl instead of clang?
>
>
>>
>> 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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