[llvm-dev] Bootstrapping LLVM+LLD with GCC toolchain failure

[Don Hinton via llvm-dev]

I think you just need to preface the variable with "BOOTSTRAP_" in order to
pass it through.  Take a look at the multi-stage cache files in
clang/cmake/cache fore examples.  In this case you can try setting
BOOTSTRAP_LLVM_ENABLE_LLD=ON.

Please note that I didn't try this, at least not yet, so I can't guarantee
it'll work out of the box, but it should get you started...



On Tue, Dec 26, 2017 at 2:23 PM, S. Jacobi via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> On Tue, 26 Dec 2017 16:14:02 +0100
> Dimitry Andric <dimitry at andric.com> wrote:
>
> > On 26 Dec 2017, at 12:00, S. Jacobi via llvm-dev
> > <llvm-dev at lists.llvm.org> wrote:
> > >
> > > Hello,
> > > I have a working GCC toolchain and wanted to use LLVM tooling
> > > instead. Following the instructions on the website I set up my
> > > build directory and have lld as an internal project under tools/.
> > > I'd like to make use of lld in stage 2 of the build and thought
> > > -DLLVM_ENABLE_LLD was the correct option to pass. However, adding
> > > this options makes the configure step fail, complaining that the
> > > compiler (GCC) does not support -fuse-ld=lld.
> > > Is it possible, and if yes - how, to set up a 2-stages build to
> > > compile LLVM, Clang and LLD so that in stage 2, only LLVM tools are
> > > part of the build process?
> >
> > For your second stage, use -D
> > CMAKE_C_COMPILER=/path/to/your/first/stage/clang -D
> > CMAKE_CXX_COMPILER=/path/to/your/first/stage/clang++, and add -D
> > LINK_FLAGS=-fuse-ld=lld.
> >
> > -Dimitry
> >
>
> So to achieve what I want I have to use 2 cmake invocations? Because,
> and I should have been clear about that in the first mail, what I was
> hoping for is a simple setup where I pass the -DCLANG_ENABLE_BOOTSTRAP
> option next to all other cmake options I want to set and after that
> invoke the generator once, hoping that cmake set up targets for stage 1
> and 2, with the proper dependencies.
>
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