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

Wed Nov 28 03:07:42 PST 2018

@Jonathan Goodwin: Do I have to use a flag to tell it where the LLVM include files are?  And would it be easier to do that in the CMake GUI?  Please tell me how you had it find the include files if that may help me.
________________________________
From: Jonathan Goodwin <jondgoodwin at gmail.com>
Sent: Wednesday, November 28, 2018 6:24 AM
To: zturner at google.com
Cc: Osman Zakir; 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 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<mailto: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<mailto: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<mailto:llvm-dev-bounces at lists.llvm.org>> on behalf of Osman Zakir via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>
Sent: Tuesday, November 27, 2018 4:30 AM
To: llvm-dev at lists.llvm.org<mailto: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<mailto:zturner at google.com>>
Sent: Tuesday, November 27, 2018 4:27 AM
To: Osman Zakir
Cc: llvm-dev at lists.llvm.org<mailto: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<mailto: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.
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