Re: [boost] Regex lib bug: wrong alignment on 64 bit platforms

The regex library contains an alignment bug that leads to bus errors on 64

bit platforms (in particular, Sun and HP). To reproduce, compile regular expression '(?>a+b|a+)bc+' with flags regex_constants::normal. This should raise SIGBUS in perl_matcher<>::push_alt(). That's a known issue, and was fixed in cvs a while ago, with almost the same fix that you used: struct saved_state { union{ unsigned int id; // these ensure that this struct gets the same alignment as derived structs: void* padding1; std::size_t padding2; std::ptrdiff_t padding3; }; saved_state(unsigned i) : id(i) {} }; John.