On Tue, 9 Nov 2010, Florian.PONROY@fr.thalesgroup.com wrote:

Hi folks,

My C++ Windows/Linux project used to compile properly using the following items:

* Boost 1.33.1, using BGL, Serialization, Thread ; * GNU g++ 4.1.2 under Linux ; * MinGW 3.4.5 under Linux (cross-compiling).

I recently updated my Boost distribution to version 1.44. Unfortunately, I now have the following BGL/linking error compiling with MinGW :

/path/to/liblocd_topology_manager.a(locTopology.o):locTopology.cpp:(.rdata$_ZZN5boost3putINS_26vec_adj_list_vertex_ id_mapINS_8propertyINS_13vertex_root_tEiNS_11no_propertyEEEjEEEEvRKNS_17two_bit_color_mapIT_EENS_15property_traitsI S8_E8key_typeENS_18two_bit_color_typeEE17elements_per_char+0x0): multiple definition of `_elements_per_char'

/path/to/liblocd_topology_manager.a(locTopology.o):locTopology.cpp:(.rdata$_ZZN5boost3putINS_26vec_adj_list_vertex_ id_mapINS_8propertyINS_13vertex_root_tEiNS_11no_propertyEEEjEEEEvRKNS_17two_bit_color_mapIT_EENS_15property_traitsI S8_E8key_typeENS_18two_bit_color_typeEE17elements_per_char+0x0): first defined here

I've checked the //www.boost.org/doc/libs/1_44_0/libs/graph/doc/trouble_shooting.html webpage, but I haven't seen any answer related to my problem.

For sure, the MinGW compiler version we use is pretty old. Since updating it would be very cumbersome in our case, I would like to be sure it's actually a compiler issue.

Thanks in advance for your advice.

This looks like a compiler issue -- elements_per_char is a static constant (using BOOST_STATIC_CONSTANT), so it should not have any linkage problems like what you're having. I'm not an expert on MinGW, so I don't know the cause of the issue; it looks similar to URL:http://efreedom.com/Question/1-1974077/Vector-Multiple-Definition-Link-E..., though. -- Jeremiah Willcock