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I did this
I ran a multi-threaded app that uses libcurl under Clang 3.9 ThreadSanitizer.
I expected the following
Ubuntu 14.04, x86_64.
I encountered a data race with two threads calling Curl_ipv6works() at the same time. I think perhaps the call to Curl_ipv6works() should be moved into curl_global_init() to avoid this.