[llvm-dev] Building LLVM with LLVM

[David Blaikie via llvm-dev]

you'd need to add -stdlib=libc++ to your C++ compiler flags, I believe

On Tue, Sep 10, 2019 at 7:16 AM Fabiano Sidler via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> Thus wrote David Blaikie:
> > If you removed your entire GCC installation (including the runtime
> > libraries and standard library), yeah, I'm not sure that'll work out of the
> > box with Clang - clang does have implementations of some pieces (libc++,
> > for instance - though clang doesn't default to using it (not sure if it'll
> > use it in favor if libstdc++ is missing, or if it'll fail)) I'm not sure
> > all the pieces are there. (I don't know the nuance of the various libgcc_s,
> > compiler-rt, etc, etc)
>
> I'm at that point now. I'v successfully built LLVM9 (including compiler-rt
> and libcxx{,abi}, but I still can't build LLVM9 without GNU's libstdc++
> because configuring without it fails with:
> ld: error: unable to find library -lstdc++
> Anyone knows how to enforce the use of LLVM's libcxx?
>
> Greetings
> Fabiano
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