[llvm-dev] Tip: How to use less RAM linking LLVM

[David Blaikie via llvm-dev]

On Thu, Sep 20, 2018 at 11:22 AM Tim Northover via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> On Thu, 20 Sep 2018 at 10:53, via llvm-dev <llvm-dev at lists.llvm.org>
> wrote:
> > I hope this helps someone. If you have any additional tips, comments or
> gotchas with this approach, please add them.
>
> LLVM_USE_SPLIT_DWARF=ON also greatly improves the situation by (I
> think) skipping linking the debug info entirely.


Pretty much


> The disadvantage is
> that lldb still doesn't quite work on the result (gdb does) and
> loading things into gdb takes longer (I think).
>

The increased loading time in GDB can be avoided by enabling gdb-index
(pass -ggnu-pubnames to the compiles, and -Wl,-gdb-index to the link step)
so the debugger doesn't have to parse all the DWARF to start.

- Dave


>
> Cheers.
>
> Tim.
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