[llvm-dev] Pardon the newbie question

[via llvm-dev]

Another way to save disk space and memory would be to build the Release
configuration, and add `-DCMAKE_C_FLAGS=-g1 -DCMAKE_CXX_FLAGS=-g1`
The `-g1` means you get debug info for line numbers, although not really
types and variables; but this is enough for symbolized backtraces after
a crash or assertion.  This is what I use normally.
--paulr

> -----Original Message-----
> From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Min-Yih Hsu
> via llvm-dev
> Sent: Thursday, April 15, 2021 5:37 PM
> To: pawel.kunio at gmail.com
> Cc: llvm-dev at lists.llvm.org
> Subject: Re: [llvm-dev] Pardon the newbie question
> 
> 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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