CMake for Mac OSX using Homebrew

[smcgill3]

This commit fixes OctoVis linking errors on a Mac OSX system using Homebrew for package management. Previously, the QGLViewer framework was not used, but an invalid -lQGLViewer flag.

[ahornung]

I need some feedback from other Mac users before merging this in. Will this still work with QGLViewer compiled from source, or installed through Macports (if that's relevant at all)?

[smcgill3]

I checked out this website:
http://www.libqglviewer.com/installUnix.html
which indicates the default behavior on OSX is:
"A Framework is created by default. Uncomment a line in QGLViewer.pro if you want to create a .dylib instead."

This framework must be linked appropriately, and I believe Homebrew gives an idea in "brew info libqglviewer":
To avoid issues with runtime linking and facilitate usage of the library:
sudo ln -s "/usr/local/Cellar/libqglviewer/2.3.17/QGLViewer.framework" "/Library/Frameworks/QGLViewer.framework"

Thus, having a libQGLViewer installed from source, without Homebrew, should work. I have not tested, however, but I may this week, if needed.

[ahornung]

Yes, it would be good if you (or anyone else on OSX) could test of it still works with a source installation, particularly the source version of QGLViewer supplied in src/extern.

[balzer82]

I wanna use Octomaps under MacOSX and have the same issue (Test 14/14 test_color_tree is failing) with actual git clone, but I used

sudo port install

for the process. What exactly should I test? (no deep understanding from my side, sorry)

[ahornung]

@balzer82: Following your tutorial on YouTube, it seems like compiling the latest release of OctoMap works nice using MacPorts. Could you test if the osx branch by @smcgill3 also works with MacPorts?
https://github.com/smcgill3/octomap/tree/osx

git clone git://github.com/smcgill3/octomap.git
cd octomap
git checkout osx
mkdir build
... compile...

For the unit test failing, please use Issue #25

[balzer82]

Checkout, cmake .. and make works until:

[ 58%] Building CXX object octovis/CMakeFiles/octovis-shared.dir/src/ColorOcTreeDrawer.cpp.o
Linking CXX shared library ../../lib/liboctovis.dylib
ld: framework not found QGLViewer
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [../lib/liboctovis.dylib] Error 1
make[1]: *** [octovis/CMakeFiles/octovis-shared.dir/all] Error 2
make: *** [all] Error 2

[isherman]

I'm on OS X 10.8.4, building QGLViewer from the source provided in octovis/src/extern.
This fork didn't compile for me without manual intervention.

The QGLViewer packaged with octovis installs by default in ~/Library/Frameworks.

OS X will only look for frameworks in /Library/Frameworks and /System/Library/Frameworks unless you provide a path at link time.

In order to compile successfully from this fork I had to sudo ln -s ~/Library/Frameworks/QGLViewer.framework /Library/Frameworks/QGLViewer.framework.

Assuming the right way to solve this is to modify CMakeLists.txt to provide an explicit path to ~/Library/Frameworks to the linker? Alternatively we could fork QGLViewer to install to /Library/Frameworks.