Confirming a bug in clang++ (freeBSD

Anonymous swell.k at
Thu Jul 1 19:43:41 UTC 2010

Eitan Adler <lists at> writes:

>>>> I have clang++ (devel/llvm-devel) built by g++45 and linked against
>>>> gcc45/ It compiles your test case fine. But I'm running
>>>> 9-current on amd64 so it may not be that useful.
>>>> IMO, gcc46 being a development branch is prone to miscompile and have bugs.
>>> I'm not that familiar with with mapping.
>>> Since g++46/* is built with g++46
>> It's more interesting which gcc version you used for compiling clang.
> I forgot. Most likely it was base gcc as I have an exemption in my
> /etc/make.conf for it.

Try to remove that conditional and rebuild with gcc46. If it doesn't
compile/work try again with gcc45.

>>> and my program is compiled by clang++ is it expected that they be
>>> compatible? If yes does that mean this is a bug in g++46 or clang++?
>> Either -lstdc++ from gcc46 is buggy or just clang++ doesn't like it.
>> It's better to use -lstdc++ from same version of gcc by which the
>> program using it was compiled.
> Is it possible to determine which one?

No. If there is an easy way I think strings(1) would show.

> Is this something that is my fault for playing around too much or did
> I expose a bug ?

It can be both. ;) I remember gcc45 segfaulting on me pretty often when
it was a devel branch.

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