jtv/libpqxx 7.7.2

libpqxx 7.7.2: re-do of 7.7.1.

on GitHub

Sorry, the 7.7.1 release was a dud. Rushed it, after bedtime, somebody talking at me. Try 7.7.2 instead.

Here's the 7.7.1 changes again:

The configure script no longer tries to tell your compiler what C++ language version it should compile. If you want a specific C++ version, you need to pass the right options to the compiler. Otherwise, you get your compiler's default C++ version.

Also:

• Fix digit_to_number not being found on some compilers. (#518, #519)
• In audit mode, define _FORTIFY_SOURCE to enable some extra checks.
• Make more functions constexpr. Nothing particularly useful though.
• Make more functions noexcept.
• Move constructor & move assignment for result.
• Deprecate set_variable/get_variable on transaction_base. (Design had unearthed warts in SQL variables, which were later fixed.)
• Set/get session variables on connection: set_session_var/get_var.
• Set/get local variables: execute SQL statements.
• When using select(), include <winsock2.h> if available. (#548)
• Fix those pointless MSVC warnings at last.
• Fix when cross-compiling using MinGW and CMake. (#548, #550)

I also reorganised the way libpqxx #includes its own headers. You may find that builds are a bit faster.