[Qgis-developer] Patch for compiling qgis-0.8pre2 with
telwertowski at comcast.net
Sat Dec 16 03:21:44 EST 2006
Mike Leahy wrote:
> Gary Sherman wrote:
>> Does this mean that it will also compile with GEOS 2.x?
> Sorry, it is 3.x only. With my very limited understanding of c++
> programming, I can only guess if it's even possible to allow compiling
> against both 2.x and 3.x.
The following seems to be a method for compiling QGIS using either GEOS
2 or 3.
1. Do not change any includes; retain "#include <geos.h>"
2. After the include of geos.h in qgsgeometry.h and qgsogrprovider.h, add:
#if GEOS_VERSION_MAJOR < 3
#define GEOS_GEOM geos
#define GEOS_IO geos
#define GEOS_UTIL geos
#define GEOS_GEOM geos::geom
#define GEOS_IO geos::io
#define GEOS_UTIL geos::util
3. Change all "geos::" in cpp files to the appropriate "GEOS_WHATEVER::"
4. Add "#if GEOS_VERSION_MAJOR < 3" code variations for any renamed methods.
I have tried this only for the ogr directory so far. I found one renamed
method. It compiles for both GEOS 2 and 3.
The work now is to find the new prefix for each of the geos prefixes in
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