[cfe-dev] Building Clang on Windows

[Dennis Luehring via cfe-dev]

im using VS2017 15.8.5 for building LLVM/clang, Release and Debug, Slow 
Dual Core, Win7 x64 and 8GB RAM

im using current LLVM source + nested clang source from github mirror

my_root
    llvm_build
    llvm <-- git clone https://github.com/llvm-mirror/llvm
      tools
        clang <-- git clone https://github.com/llvm-mirror/clang

cd my_root

and these CMake build steps

cd llvm_build

cmake -Thost=x64 -G "Visual Studio 15 2017 Win64" 
-DLLVM_TARGETS_TO_BUILD=host ..\llvm
(i see that "Win64" is missing in your examples)

then

cmake --build . --config Debug

or

cmake --build . --config Release

just works out of the box

(takes some time and is nearly swapping using VStudio IDE instead of 
cmake--build to build)

Am 04.10.2018 um 15:24 schrieb Fábio Picchi:
> Updates:
> > Are you building debug or release? If debug, try building release.
> I tried and got the same error.
>
> I noticed my *build target* was *Win32* even though I passed the option
> -Thost=x64 to cmake. I followed the new instructions to regenerate the
> solution using:
> cmake -G "Visual Studio 15 2017" -A x64 -Thost=x64 ..\llvm
>
> Now the build target is displayed as *x64*. I tried to build it in Debug
> mode and still got the dreaded error:
> C1060: compiler is out of heap space
>
> I couldn't check the log errors in detail because I had to leave for work
> but I'll post more updates in the evening.
>
> I will try to do some research on the weekend but it would be great if
> someone could better explain the out of heap space error. How can the
> linker run out of memory just by linking binaries? Why is this process so
> memory intensive? Furthermore, why does it matter if I am targeting x86 or
> x64? I understand the pointers double in size but that would mean more
> memory usage for the x64 target, not the x86.
>
> Thank you very much for the help!
>
> On Thu, Oct 4, 2018 at 4:19 AM Dennis Luehring via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
> > Am 03.10.2018 um 23:29 schrieb Reid Kleckner via cfe-dev:
> > > Can anyone who actually knows answer Shaob's question? He asked "Does the
> > > Win64 generator automatically imply -Thost=x64?
> >
> >
> > CMake gives a warning if not using -Thost=x64 with VS2017 generator
> > Win64 that i could happen that the x86 tool chain is used - so i think
> > its not automatically implied
> >
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> >
>