[llvm-dev] LLVM building problem

[Andrzej Warzynski via llvm-dev]

I also recommend making sure that you're using the gold linker. AFAIK
Ubuntu defaults to BFD. Gold is much more memory efficient. LLD would be
even better.

Most likely ld on your system is a symlink to the actual linker binary.
Just check what it points to (I suspect that it's going to be ld.bfd or
something similar) and update accordingly (e.g. to ld.gold).

Hope this helps.

-Andrzej

On 19/09/2019 11:54, Dimitry Andric via llvm-dev wrote:
> On 19 Sep 2019, at 11:24, Enrique González via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>>
>> I'm using a Virtual Machine with Ubuntu 18.04 at VIrtualBox and I'm trying to build the LLVM project from https://github.com/llvm/llvm-project.git.
>>
>> This VM has 6 cores (from an intel core i-7 8th gen), 11GB of RAM and 300GB of storage (from a 1TB HDD) at a laptop, this is the model: MSI GS63 Stealth 8RE.
>>
>> Then, I'm doing exactly that this tutorial says to build LLVM: https://llvm.org/docs/GettingStarted.html
>>
>> 1) Clone the project from git: "git clone  https://github.com/llvm/llvm-project.git".
>> 2) Use cmake at the build directory: "cmake -G 'Ninja' ../llvm".
>> 3) Build the project with ninja: "ninja" (i do not use any flag).
>>
>> It seems to build well until i reach the final part, where the build try to link CXX executables. At this point, the VM freeze and I cannot do anything. I also have tried to expand the SWAP memory creating a second swap file with 90GB and the VM also freeze.
>
> Try adding -D LLVM_PARALLEL_LINK_JOBS=1 to your CMake command line.  The problem is that ninja will likely start 12 (on your system at least) link jobs at the same time, since these tend to bunch together.  That will rapidly exhaust almost any machine's memory.
>
> If -D LLVM_PARALLEL_LINK_JOBS=1 works, you can try increasing it bit by bit until the memory usage is acceptable.
>
> And yes, this setting should most likely be a default... :)
>
> -Dimitry
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.