CMake build does not install symlinks for libgeos.so.<version>

[Kirill888]

Using 3.8.0 release tar ball from github and using cmake:

mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Release ..
make install

Symlink to libgeos_c.so.1.13.1 are installed but not for libgeos.so.3.8.0, note that symlink is present in the build/lib folder but doesn't get copied into /usr/lib/ by make install

Install the project...
-- Install configuration: "Release"
-- Installing: /usr/local/lib/libgeos.so.3.8.0
-- Installing: /usr/local/lib/libgeos_c.so.1.13.1
-- Installing: /usr/local/lib/libgeos_c.so.1
-- Set runtime path of "/usr/local/lib/libgeos_c.so.1.13.1" to ""
-- Installing: /usr/local/lib/libgeos_c.so
...

I'm using cmake 3.16.0 on Ubuntu 18.04

cmake --version
cmake version 3.16.0

CMake suite maintained and supported by Kitware (kitware.com/cmake).

[strk]

Please report your issue on geos.osgeo.org

[pramsey]

This is by design.

a71e095

Basically, since we are not making semver guarantees for the C++ libraries (in particular, ABI compatibility doesn't even always cross over on patch release, though it mostly does we don't check), we aren't including symlinks that would allow people to take advantage of those (non-existent) guarantees.