[llvm-dev] Building LLVM with VisualStudio 2017

Sun Nov 18 23:58:15 PST 2018

Hello Stella and Stefan,

I actually worked around the problem by installing the LLVM plug-in for Visual Studio - now I was able to successfully link the LLVM libraries in projects where I used clang as the compiler.
As a linker I always used the MSVC linker - for building LLVM/Clang and the said project.

Kind greetings
Björn

-----Original Message-----
From: Stefan Gränitz <stefan.graenitz at gmail.com>
Sent: Freitag, 16. November 2018 01:11
To: Stella Stamenova <stilis at microsoft.com>; Gaier, Bjoern <Bjoern.Gaier at horiba.com>; Dennis Luehring <dl.soluz at gmx.net>
Cc: llvm-dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Building LLVM with VisualStudio 2017

Hi Björn, hi Stella

Sorry, didn't notice this thread earlier. In January I had a similar issue with LLVM 3.8 on Window 10. I couldn't solve it, but my workaround at least unblocked development: I simply defined an external C function with that exact name myself :-) Something like:

external "C" void __std_reverse_trivially_swappable_8() {}

With that the linker was happy. I put an explicit breakpoint instruction in there and it was never actually hit. In case you want to investigate further, there are more people with this problem here:
https://github.com/protocolbuffers/protobuf/issues/4129

Cheers
Stefan

Am 14.11.18 um 23:41 schrieb Stella Stamenova via llvm-dev:
> Hey Bjorn,
>
> Were you able to figure this out or is it still broken for you?
>
> Our scenario is a little bit different, but I have a theory as to what may be going wrong. What linker are you using when you compile your project with clang-cl? I am wondering whether the version of the linker and/or the libraries that you are using is too old in comparison to the one used for the clang compilation.
>
> Thanks,
> -Stella
>
> -----Original Message-----
> From: Gaier, Bjoern <Bjoern.Gaier at horiba.com>
> Sent: Sunday, October 28, 2018 11:48 PM
> To: Stella Stamenova <stilis at microsoft.com>; Dennis Luehring
> <dl.soluz at gmx.net>
> Cc: llvm-dev <llvm-dev at lists.llvm.org>
> Subject: RE: [llvm-dev] Building LLVM with VisualStudio 2017
>
> Hey Stella,
>
> (Gaier is my last name :0)
>
> I do the same steps as you do! The resulting Clang compiler is indeed working. I have problems with the LLVM library.
>
> When I build the LLVM7 I use the libraries of it in a different project - a JIT client.
> When I compile this solution with Visual Studio 2017 and the MSVC compiler, then I get no problems.
>
> But, when I switch to the Clang-cl compiler in Visual Studio 2017, then I get suddenly these undefined references.
> The strange thing is, that this also happens when I compile the LLVM with a preinstalled Clang.
>
> Kind greetings
> Björn
>
> -----Original Message-----
> From: Stella Stamenova <stilis at microsoft.com>
> Sent: Freitag, 26. Oktober 2018 21:02
> To: Gaier, Bjoern <Bjoern.Gaier at horiba.com>; Dennis Luehring
> <dl.soluz at gmx.net>
> Subject: RE: [llvm-dev] Building LLVM with VisualStudio 2017
>
> Hey Gaier,
>
> Can you give a few more details on your scenario? We use build LLVM with VS 2017 and we can successfully compile programs with clang afterwards.
>
> At a high level, what we do is:
> 1) Call Cmake to generate VS2017 Solution
> 2) Build the solution
> 3) Now use clang to compile other programs
>
> Thanks,
> -Stella
>
> -----Original Message-----
> From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Gaier,
> Bjoern via llvm-dev
> Sent: Friday, October 26, 2018 2:52 AM
> To: Dennis Luehring <dl.soluz at gmx.net>
> Cc: llvm-dev <llvm-dev at lists.llvm.org>
> Subject: Re: [llvm-dev] Building LLVM with VisualStudio 2017
>
> But building the LLVM and Clang is no problem at all.
> The problem occurs when I use the generated LLVM lib files in a project, which I compile with Clang.
>
> -----Original Message-----
> From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Dennis
> Luehring via llvm-dev
> Sent: Freitag, 26. Oktober 2018 11:41
> To: llvm-dev at lists.llvm.org
> Subject: Re: [llvm-dev] Building LLVM with VisualStudio 2017
>
> something i expirenced when i added the IRParser lib to the Fibonacci
> example (using cmakelists.txt) - in a clean first build
>
> after the change i was unable to build the project (with masses of
> errors)
>
> rebuilding on the console with cmake build "repaired" the sln
>
>
> Am 26.10.2018 um 11:25 schrieb Gaier, Bjoern via llvm-dev:
>> Hello everyone,
>>
>> so there is something that really bothers me. In the past I build LLVM and Clang via the source code and Visual Studio 2015.
>> In my project I used then the freshly new build Clang and the LLVM.
>>
>> But now, since I compiled with Visual Studio 2017 this is not possible anymore. I'm able to compile both, the LLVM and clang, but when I then use clang as the compiler and the LLVM in my project, I get undefined references to: "__std_reverse_trivially_swappable_4"
>> And other functions like this.
>>
>> I also tried, when CMake has generated the Solution file, to change the compiler to LLVM. Clang is executed then, but still - the same error will occur in my project or different projects when they are compiled with Clang.
>>
>> What am I doing wrong? It prevents me from continuing my project...
>>
>> Kind greetings
>> Bj rn
>>
>>
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