Re: [Boost-users] 'Multiply defined' errors in Boost 1.38.

Subject: Re: [Boost-users] 'Multiply defined' errors in Boost 1.38.
From: Juergen Hunold (juergen.hunold_at_[hidden])
Date: 2009-02-22 11:06:35

Hi Nigel !

On Sunday 22 February 2009, Vladimir Prus wrote:
> Dyer, Nigel wrote:
> > Hi
> >
> > There is a problem with the 1.38 release of Boost that is
> > preventing me from compiling using gcc on a mac some code that
> > compiled correctly in previous releases.  I now get lots of
> > 'multiply defined' error messages when certain boost header files
> > are included in specific ways, e.g.
> >
> > /usr/libexec/gcc/i686-apple-darwin8/4.0.1/ld: multiple definitions
> > of symbol boost::test_tools::(anonymous namespace)::check_is_close
> > bin/darwin-4.0.1/release/link-static/threading-multi/Lexer/BiobaseL
> >exer. o definition of boost::test_tools::(anonymous
> > namespace)::check_is_close in section (__DATA,__common)
> > bin/darwin-4.0.1/release/link-static/threading-multi/Lexer/ArrayLex
> >er.o definition of boost::test_tools::(anonymous
> > namespace)::check_is_close in section (__DATA,__common)

That looks like #2390 again. 

https://svn.boost.org/trac/boost/ticket/2390

Can you apply 

http://svn.boost.org/trac/boost/changeset/49865

and maybe 

http://svn.boost.org/trac/boost/changeset/50388

and see if this fixes the issue ?

> thanks for a comprehensive bug report. On the first look, it appears
> that Boost.Build change is actually right -- it fixes a previously
> introduced bug that made PCHs non-functional. And, then, it appears
> that including boost.test in PCH somehow upsets the compiler. Do
> things improve if you take all boost.test headers out of bio-pch.h?

It cleanly compiles with gcc-4.3.2 on Linux. Strange.

> P.S. Please don't ask new questions by replying to unrelated email,
> I've nearly missed this one.

Yes :-))

Yours,

Jürgen
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