On May 17, 2012, at 7:57 AM, Gavin Band <gavinband@googlemail.com> wrote:

Change #2: at libs/iostreams/src/zlib.cpp:153: change "crc_imp_ = 0;" to "crc_ = crc_imp_ = 0;"

Rationale: without this change, an empty block of data does not re-initialise the member variable crc_ of zlib_base.  This causes an exception on line 447 of boost/iostreams/filter/gzip.hpp.

Could someone take a look at this and let me know if this change is really appropriate?  (Or perhaps I'm doing something wrong.)  I can create a bug report if desired.

I'm not qualified to comment on your specific fix, but I often do see library authors requesting a Trac ticket - especially to attach a proposed patch. That way it doesn't depend on the author to remember a mail message.