Hello, I have created two little helper functions for parsing strings with respect to unit length values: OptLengthQuantityT parse_length_quantity(...) PairOptLengthQuantityT parse_dbl_length_quantity(...) My problem is that my implementation based on the spirit and units libraries does compile fine, but fails on linking on 32Bit Debug with the following error message: Quantity.obj : fatal error LNK1179: invalid or corrupt file: duplicate COMDAT '?value@?$result_@U?$member_variable@$$A6E?AUlength_quantity_t@Quantitie s@@XZP8?$length_quantity_grammer@V?$_String_const_iterator@DU?$char_trai ts@D@std@@V?$allocator@D@2@@std@@U?$expr@Uterminal@tag@tagns_@proto@boos t@@U?$term@U?$char_code@Uspace@tag@spirit@boost@@Uiso8859_1@char_encodin g@34@@tag@spirit@boost@@@argsns_@45@$0A@@exprns_@proto@boost@@@2@AE?AU12 @XZ@detail@phoenix@boost@@@?$is_mem_fun_pointer_select@$0A@@detail@boost @@2_NB' I'm working with the msvc 2010Sp1 compiler from microsoft on windows 7. I have tried to shorten the symbol names but I could not get it to work. Does anyone has experience with this kind of errors? Is there something wrong with the implementation of the two functions? You can find the implementation in the attached files. Best, Johannes