Hi! Today I upgraded to Ubuntu 26.04 which ships with libspatialindex
2.1 and could not compile QGIS. For anyone running into the same
problem, you can set the compile option WITH_INTERNAL_SPATIALINDEX=ON
and use the libspatialindex 2.0 shipped with QGIS.
https://github.com/qgis/QGIS/commit/0b1ba631b36dc6903f3dcdf7ffe3970cdedab4dd
Raymond
On 9/16/25 02:39, Nyall Dawson via QGIS-Developer wrote:
On Tue, 16 Sept 2025 at 10:37, Nyall Dawson <[email protected]
<mailto:[email protected]>> wrote:
Hi list,
While tracking down the failures from https://github.com/qgis/QGIS/
pull/63180 <https://github.com/qgis/QGIS/pull/63180>, it's revealed
that using QGIS with libspatialindex >= 2.0 gives completely
misleading results for nearest neighbour geometry searches.
The root cause is an optimisation from the upstream library
(https://github.com/libspatialindex/libspatialindex/
commit/6fe9ff769243579ed74f7f27409dd1dda6591634 <https://github.com/
libspatialindex/libspatialindex/
commit/6fe9ff769243579ed74f7f27409dd1dda6591634>) that breaks how
downstream clients could previously implement custom nearest
neighbour comparators. From my research I don't think this is
fixable in QGIS, and will need an upstream fix.
Sorry -- to clarify, that should have been >= 2.1 . 2.0 did not include
the offending commit.
Nyall
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