[llvm-dev] Have LLD and Clang in their correct locations, but still can't generate project files for LLVM

Tue Nov 27 17:24:17 PST 2018

I am evidently one of those rare people successfully building LLVM v7
inside VS 2017 and targeting WebAssembly. Unlike Osman, I build the 32-bit
version, but I suspect I would have no significant trouble switching to
building the 64-bit version.

I use CMake-Gui vs. Osman using Cmake on the command line. This allows me
to use the mouse to select the CLANG_BUILD_TOOLS and LLD_BUILD_TOOLS
options which are also needed to build those tools along with the rest of
LLVM. I do this after the Configure step and before the Generate step.

When that is done, I double click on the generated LLVM.sln file to fire up
Visual Studio. I then right-click on BUILD_ALL to build LLVM, followed by
right-clicking on INSTALL to finish the process a few hours later.

That said, I looked at Osman's log and saw the build was struggling to
locate various include files, which seems a very basic error suggesting
something fundamentally is amiss with how the build is locating LLVM source
files. I know too little about Osman's set up and LLVM's CMake process to
hazard a guess as to what might be causing that.

On Wed, Nov 28, 2018 at 9:52 AM Zachary Turner via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> I think most people are using ninja to do the build.  You can still use
> the Visual Studio generator for the IDE experience while doing build from
> ninja.  I know there are a couple of people who build from inside of Visual
> Studio, but it's a pretty small number, and I don't think they are
> targeting WebAssembly.
>
> On Tue, Nov 27, 2018 at 12:46 PM Osman Zakir via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Is there no one who has already built LLVM for targeting WebAsesembly
>> with, using Visual Studio 2017 as the generator and toolchain (x64 of
>> course)?
>>
>> My LLVM root folder is C:/llvm, and LLD and Clang are in
>> llvm_root/tools/lld and llvm_root/tools/clang respectively.  If this is as
>> it should be, then what's the problem? Would someone please help me with
>> this by also checking the logs I've attached to the first message in this
>> thread?  Thanks in advance.
>>
>> In llvm/tools/, I see there's also a folder called "msbuild" which also
>> has a .sln file called llvm.sln.  How about if I just try to build that
>> (and if needed, would it be okay to just put the preprocessor definition
>> LLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly in there for each
>> project?)?
>> ------------------------------
>> *From:* llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Osman
>> Zakir via llvm-dev <llvm-dev at lists.llvm.org>
>> *Sent:* Tuesday, November 27, 2018 4:30 AM
>> *To:* llvm-dev at lists.llvm.org
>>
>> *Subject:* Re: [llvm-dev] Have LLD and Clang in their correct locations,
>> but still can't generate project files for LLVM
>> Yeah, I don't think that matters.  It did set the toolset architecture to
>> x64.
>>
>> You know, I attached those log files for a reason.
>> ------------------------------
>> *From:* Zachary Turner <zturner at google.com>
>> *Sent:* Tuesday, November 27, 2018 4:27 AM
>> *To:* Osman Zakir
>> *Cc:* llvm-dev at lists.llvm.org
>> *Subject:* Re: [llvm-dev] Have LLD and Clang in their correct locations,
>> but still can't generate project files for LLVM
>>
>> I don't know if it actually matters, but I think there should not be a
>> space after -T.  Usually I would specify it like -Thost=x64.
>>
>> On Mon, Nov 26, 2018 at 8:53 AM Osman Zakir via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>> I ran CMake on the command line with this command:
>> "
>> cmake .. -DCMAKE_INSTALL_PREFIX=../install_x64 -T host=x64 -G "Visual
>> Studio 15 2017 Win64" -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly
>> "
>>
>> And I have LLD and Clang where they should be.  But I still couldn't
>> generate project files.  The path to the build and installation directories
>> don't have spaces at all this time, either.  I'm attaching the logs to this
>> message.  Please help.
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
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