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[Dimitry Andric]

On 2012-10-22 16:58, Jan Beich wrote:
> Dimitry Andric <dim at FreeBSD.org> writes:
>> On 2012-10-22 09:00, Jan Beich wrote:
...
>>> undefined reference to `std::__1::basic_ios<char,
>>> std::__1::char_traits<char> >::clear(unsigned int)'
>>> clang++: error: linker command failed with exit code 1 (use -v to
>>> see invocation)
>> Strange, for me it compiles (with a bunch of warnings, which I have
>> fixed locally), and links just fine.  However, I always use -std=c++11,
>> which -std= flag are you using, if any?
> Adding -std=c++11 doesn't help. Neither yours or Garrett's patches.
> Instead, removing local -finline-functions (implied by -O3) does.

With clang, -O3 does not imply -finline-functions, but it may have some
influence on the threshold for inlining.

This error is still very strange though, and it might be a real bug in
the optimizer at -O3; at this level, it really seems to generate a call
to a function that is declared inline, with the __always_inline
attribute.

For now, I would advise not to use higher levels than -O2.  Meanwhile, I
will take this problem to the llvm/clang guys.