[llvm-dev] lld on Windows

[Rui Ueyama via llvm-dev]

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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