【QGIS跨平台编译】之【rttopo跨平台编译】：源码及跨平台编译工程（支撑QGIS跨平台编译，以及二次研发）

RT Topology Library =================== ## Build status | OSGeo | GitLab | |:--- |:--- | | [] (https://dronie.osgeo.org/rttopo/librttopo?branch=master) | [] (https://gitlab.com/rttopo/rttopo/commits/master) | ## About The RT Topology Library exposes an API to create and manage standard (ISO 13249 aka SQL/MM) topologies using user-provided [data stores] (doc/DATASTORES.md) and released under the GNU GPL license (version 2 or later). The code is derived from [PostGIS](http://postgis.net) liblwgeom library enhanced to provide thread-safety, have less dependencies and be independent from PostGIS release cycles. The RT Topology Library was funded by "Regione Toscana - SITA" (CIG: 6445512CC1), which also funded many improvements in the originating liblwgeom. Official code repository is https://git.osgeo.org/gitea/rttopo/librttopo A mirror exists at https://gitlab.com/rttopo/rttopo, automatically updated on every push to the official repository. Development mailing list: https://lists.osgeo.org/mailman/listinfo/librttopo-dev ## Building, testing, installing ### Unix Using Autotools: ./autogen.sh # in ${srcdir}, if obtained from GIT ${srcdir}/configure # in build dir make # build make check # test make install # or install-strip ### Microsoft Windows See [separate document](doc/BUILDING-ON-WINDOWS.md) ## Using The public header for topology support is `librttopo.h`. The caller has to setup a backend interface (`RTT_BE_IFACE`) implementing all the required callbacks and will then be able to use the provided editing functions. The contract for each callback is fully specified in the header. The callbacks are as simple as possible while still allowing for backend-specific optimizations. The backend interface is an opaque object and callabcks are registered into it using free functions. This is to allow for modifying the required set of callbacks between versions of the library without breaking backward compatibility.