Now that I'm thinking about I'm remembering a bit more. I have a free standing test of the utf8_codecvt facet as part of the serialization library tests. This test has always passed. I have a test test_array_warchive which fails originally (and now again) with a run time error - double deletion of some object. I spent a huge amount of time trying to figure this out. I concluded that depending on inclusions, sometimes the standard library implementation would be linked with the header from the boost utf8_codecvt (or something like that). So this problem only showed in this one test which was not specific to utf8_codecvt facets. Maybe I got the fix wrong, but now test_array_warchive is failing again on develop. Robert Ramey -- View this message in context: http://boost.2283326.n4.nabble.com/serialization-libstdc-detail-utf8-codecvt... Sent from the Boost - Dev mailing list archive at Nabble.com.