[cfe-dev] Out of Memory Building Clang and LLVM

[James Courtier-Dutton via cfe-dev]

On Wed, 19 Jun 2019 at 23:36, nick via cfe-dev <cfe-dev at lists.llvm.org>
wrote:

> Greetings,
>
> Seems I'm running out of memory on a host system trying to build llvm,
> tooling and clang. It was configured
> as:
> cmake -DLLVM_ENABLE_PROJECTS=clang -G "Unix Makefiles" ../llvm
>
> and build with:
>
> make -j4 using gcc as the host compiler, version 8.
>
> The dmesg I'm getting is related to the linker and not sure if the linker
> has a bug or it's normal
> to expect 3GB or more used for linking clang. Doesn't seem to be but not
> sure.
>
> dmesg output:
> [186517.023397] Out of memory: Kill process 2143 (ld) score 286 or
> sacrifice child
> [186517.023403] Killed process 2143 (ld) total-vm:4622188kB,
> anon-rss:3202188kB, file-rss:4kB, shmem-rss:0kB
>
>
>
HI,

I have a 16 Core/32 Thread system with 32GB RAM, and it can have difficulty
building CLANG/LLVM.
The link stage definitely needs to be with make -j1.

That being said, if you force a "Release" version, and not the "Debug"
version, much less RAM is needed.

Kind Regards

James
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