Support for Kakadu 32 and 64bit version

[Martin Mikita]

I experienced problems with adding Kakadu support for x64 compilation with Visual Studio 2012.

OBJ_PREFIX variable is hardcoded for x86 (32bit) version, in 1.11.1 also for version 6 of Kakadu.

I made diff file for this change. I am not sure, whether new object files (see diff file) is required for v6, but they are definitely required for kakadu 7.5. I do not know how append version checking for this.

[Martin Mikita]

Support for Kakadu x86 and x64 in Visual Studio

[Robert Coup]

Ideally we need to use the KDU_{MAJOR,MINOR}_VERSION macros from #5946, but we'll likely need to do some compile-the-header-file-to-get-them-during-configure nastiness to actually get the values.

@rouault, are there other examples of doing that sort of thing in GDAL? Makefiles are not my forté

[Even Rouault]

@rouault, are there other examples of doing that sort of thing in GDAL? Makefiles are not my forté

In configure.in, we have various tests to detect versions/variants. Arbitrary example :

    rm -f testiconv.*
    echo '#include <iconv.h>' > testiconv.cpp
    echo 'int main(int argc, char** argv) { iconv_t cd = 0; return iconv (cd, (const char **) 0, 0, 0, 0); } ' >> testiconv.cpp
    if test -z "`${CXX} ${CPPFLAGS} testiconv.cpp -c 2>&1`" ; then
        AC_MSG_RESULT([using ICONV_CPP_CONST="const"])
        ICONV_CPP_CONST="const"
    else
        AC_MSG_RESULT([using ICONV_CPP_CONST=""])
        ICONV_CPP_CONST=""
    fi
    rm -f testiconv.*

But AFAIC there's no way to do that on Windows nmake makefiles. Or at least not like that. frmts/mrsid/nmake.opt has very complicated logic to detect the MrSID SDK version, by checking which files are available, and looking for strings in them.

[Even Rouault]

Adressed by #6052