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There's also a packaging point of view to take into account (thinking to<br class="">
OSGeo4W in particular). For a 2 year LTR, you likely need to make sure that<br class="">
the dependencies of the LTR are controlled independently of the ones of QGIS<br class="">
master. You might want to decide to update one of the dependencies in the LTR<br class="">
(like upgrading to a new patch release of a dependency), but this must be a<br class="">
choice, not a mechanical consequence of an upgrade of QGIS master.<br class="">
<br class="">
Another thought is that some dependencies of QGIS (thinking to GDAL & PROJ)<br class="">
don't have a 2 year life span for a given release, but more a 1 year one<br class="">
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<span style="caret-color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Right
-- as an example as soon as proj 7 rolls out without the older</span><br style="caret-color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">api
compatibility, 3.4 will no longer build (and **CANNOT** be fixed</span><br style="caret-color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">to
do so). So when distros update to this that's the definite EOL for</span><br style="caret-color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">3.4
support on those distros…</span></div>
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<div>We’ve decided to extend the lifetime of the old API for the PROJ 7 release cycle [0]. So it will not</div>
<div>be PROJ that gives QGIS 3.4 the kiss of death. The decision was made to avoid situations like</div>
<div>this.</div>
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<div>Even and Nyalls point above of course still stands. With the many dependencies QGIS has this situation</div>
<div>will come up sooner or later.</div>
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<div>/Kristian</div>
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<div>[0] <a href="https://lists.osgeo.org/pipermail/proj/2020-January/009289.html" class="">
https://lists.osgeo.org/pipermail/proj/2020-January/009289.html</a></div>
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