[llvm-dev] Pardon the newbie question

[Min-Yih Hsu via llvm-dev]

You can use `LLVM_USE_LINKER=lld` CMake variable to adopt LLD (to build LLVM). And yes, LLD takes less memory and runs faster. Here are some other tips to save memory:
1. You can use `LLVM_PARALLEL_LINK_JOBS=N` (also a cmake variable) to limit the amount of parallel linker jobs to save some memory.

2. Build libraries as shared library via `BUILD_SHARED_LIBS=ON` CMake variable can dramatically speed up the linking time and save you some memory.

3. Since you’re building a Debug build (and you’re building on Linux), `LLVM_USE_SPLIT_DWARF` can dramatically reduce the size of debug info, which, to some extend, also save you some memory during link time.

Best,
-Min
> On Apr 15, 2021, at 1:05 PM, pawel k. via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Hello,
> Im trying to build trunk clang in debug version on oldish ubuntu with low mem. Linking lli takes ages and fails on low mem. Is there a chance building would succeed if i used lld instead of ld? If so is there an option either to force lld or whole clang toolchain use in cmake instead of default gcc (both gcc and clang are avail on system)? Otherwise I think ill stick with release.
> 
> Best regards,
> Pawel Kunio
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