Use wcstombs and friends to perform Unicode conversion inside the ODBC
driver. Functionality should be identical as before, except that
installations without iconv will now be able to compile and install the
Unicode (libmdbodbcW) driver.
iconv remains present in the main libmdb library.
Defining _XOPEN_SOURCE explicitly in the source file leads to all kinds
of cross-platform headaches, plus incompatibilities between
configure-time capabilities and compile-time features. Let autoconf sort
out how to expose the largest number of functions in a way that is
consistent between configuration and compilation.
Previously we needed the cflags to include the original HAVE_ICONV value
so that MdbHandle looked the same to client applications as it did to
the compiled library. Now we use a .in file for the header so that these
definitions are not necessary when the client is compiling.
When searching for unixODBC, we want to use
the libdir passed in to autotools (--libdir)
to ensure that we find the library
for the correct ABI.
It is possible that we pick up the wrong
copy from e.g. /usr/lib/ where a 32-bit
unixODBC copy of the library exists
when we're in the middle of a 64-bit build.
Use ${libdir} to ensure we respect
any preferences/information given and
search for ODBC in the right place.
Note that this previously affected
us with iODBC but that's since been
resolved by using their
iodbc-config binary.
Bug: https://bugs.gentoo.org/697568
Signed-off-by: Sam James <sam@gentoo.org>
