[Bug 1564571] [NEW] cmake 3.5.1 no longer passes -soname to linker reliably

[Michał Sawicz]

Public bug reported:

I'm not exactly sure what's going on here, but cmake 3.5 caused our
tests to fail, I've tracked it down to this difference in linking:

http://pastebin.ubuntu.com/15570327/

For whatever reason the below isn't passed any more,

> -Wl,-soname,libUbuntuGesturesQml.so

which results in our tests failing to find symbols:

> QObject::connect: signal not found in DirectionalDragArea

Re-running the linker command with the missing options makes it all work
again.

You can even see there are two spaces where the -Wl,-soname option
should be.

FWIW, the CMakeLists.txt in question is: https://bazaar.launchpad.net
/~unity-
team/unity8/trunk/view/head:/plugins/Ubuntu/Gestures/CMakeLists.txt

I suppose this should be SHARED and not MODULE if we want to link to it,
but that doesn't change anything actually.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: cmake 3.5.1-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-16.32-generic 4.4.6
Uname: Linux 4.4.0-16-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Mar 31 20:25:08 2016
SourcePackage: cmake
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: cmake (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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Title:
  cmake 3.5.1 no longer passes -soname to linker reliably

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