[llvm-dev] [EXTERNAL] Re: Linking issue with clang/libc++

[Oleg Smolsky via llvm-dev]

Wow, that's interesting! Thank you for hint, Anton!

How did this dependency come into the build? I don't see any direct
references to the symbol... so, is it something acquired transitively?... I
am surprised that some (supposedly portable) code contains a buried libgcc
dependency... I'm not linking binary artifacts here...

On Fri, Sep 3, 2021 at 12:29 PM Anton Korobeynikov <anton at korobeynikov.info>
wrote:

> This symbol is a part of compiler runtime. In your case – you need to
> link libgcc.
>
> On Fri, Sep 3, 2021 at 9:01 PM Oleg Smolsky via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> >
> > Folks, I'm hitting a funky issue while building a Boost tool with
> Clang/libc++. Here is the compiler invocation:
> >
> > $ /opt/llvm-12/bin/clang++ -std=c++11 -O2 -stdlib=libc++
> -Wno-mismatched-tags -O2 -s -DNDEBUG builtins.cpp class.cpp ...........
> pathunix.cpp -o b2
> >
> > And I get this:
> >
> > /opt/llvm-12/bin/../lib/libc++.so.1: undefined reference to
> `__divmodti4 at GCC_7.0.0'
> >
> > Clang itself was built with GCC-11... so I fail to understand where this
> symbol is coming from. Can someone shed some light on this please?
> >
> > Thanks in advance,
> > Oleg.
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
>
> --
> With best regards, Anton Korobeynikov
> Department of Statistical Modelling, Saint Petersburg State University
>
>
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