the same happens to me in case of I link code compiled with -g and other code compiled with -O2. I think it is just a warning that the linker picks up a certain copy of code which is available more than once. ________________________________ From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of James Madison Sent: Monday, January 12, 2009 14:23 To: Boost-users@lists.boost.org Subject: [Boost-users] [Variant] Odd linker errors that somehow involveboost::variant [NOTE : this is using boost v1.32. I am forced to use this version] In the code I am trying to compile I have a boost variant defined as: boost::variant<int, char, double, std::string, ACE_Time_Value> and it is used in several different ways. This project compiles and links fine using debug settings, essentially the -g flag in gcc, however whenever I try to compile without that flag I get the following error, repeated hundreds of times: `.gnu.linkonce.t._ZNSt3mapIiN5boost7variantIicdSs14ACE_Time_ValueNS0_6detail7variant5void_ES5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_EESt4lessIiESaISt4pairIKiS6_EEEixERSA_' referenced in section `.gnu.linkonce.r._ZNSt3mapIiN5boost7variantIicdSs14ACE_Time_ValueNS0_6detail7variant5void_ES5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_EESt4lessIiESaISt4pairIKiS6_EEEixERSA_' of ./src/geneva/infra/messaging/ResponseMsg.o: defined in discarded section `.gnu.linkonce.t._ZNSt3mapIiN5boost7variantIicdSs14ACE_Time_ValueNS0_6detail7variant5void_ES5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_EESt4lessIiESaISt4pairIKiS6_EEEixERSA_' of ./src/geneva/infra/messaging/ResponseMsg.o Google is not helping diagnose the problem at all. I am wondering if anyone here can point me in the right direction.