llvm dev - Sep 2021 - Linking issue with clang/libc++

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.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20210903/2901d271/attachment.html>

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