Re: duplicate symbol from boost
Re: duplicate symbol from boost
- Subject: Re: duplicate symbol from boost
- From: Nivek Research <email@hidden>
- Date: Sun, 13 Jun 2010 08:29:33 -0400
You may be experiencing the effects of a bug in GCC <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10591>. The symbols in question are declared in the anonymous namespace and, therefore, global, but due to the bug they are not unique. I have not found an acceptable workaround and for other reasons I'm stuck using the GCC 4.0 compiler, but I would appreciate hearing if you do find a solution.
--kevin
On Jun 11, 2010, at 5:14 PM, email@hidden wrote:
> We have 2 main projects; one for a desktop product and one for a server product. They both contain the same subprojects. They have different but somewhat similar pch files. One of the subprojects relies heavily on boost. When I build the server project, I'm getting this:
>
> ld: duplicate symbol boost::lambda::(anonymous namespace)::_3 in /depot/cmyk/xcodebuilds/Debug/libAGLServerDB.a(MultiAdBlitters.o) and /depot/cmyk/xcodebuilds/Debug/libAGLServerDB.a(hsGBitmapBlitters.o)
>
> This symbol comes from boost/lambda/core.hpp and looks like this:
>
> namespace boost {
> namespace lambda {
>
> namespace {
>
> // These are constants types and need to be initialised
> boost::lambda::placeholder1_type free1 = boost::lambda::placeholder1_type();
> boost::lambda::placeholder2_type free2 = boost::lambda::placeholder2_type();
> boost::lambda::placeholder3_type free3 = boost::lambda::placeholder3_type();
>
> boost::lambda::placeholder1_type& _1 = free1;
> boost::lambda::placeholder2_type& _2 = free2;
> boost::lambda::placeholder3_type& _3 = free3;
> // _1, _2, ... naming scheme by Peter Dimov
> } // unnamed
>
> } // lambda
> } // boost
>
> What could cause this symbol to generate that error in one project and not in another.
>
> Steve Mills
> Drummer, Mac geek
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