Dynamic linking problems with the fmod API

The Projucer
1

Hi, I’ve been trying to link the fmod API with JUCE for a GUI application. I did this through setting my ‘external libraries to link’ to the required .dylibs.Screenshot 2020-05-08 at 10.00.38

I then set the header and library search paths to the places where the header files and .dylibs were. Screenshot 2020-05-08 at 10.18.56

I thought this would be the correct way to set it up. The project can build however it very quickly runs into this error:

dyld: Library not loaded: @rpath/libfmodstudioL.dylib

Referenced from: /FMODJUCETEST/Builds/MacOSX/build/Debug/FMODJUCETEST.app/Contents/MacOS/FMODJUCETEST

Reason: image not found

Am I not setting up the projucer right to link these libraries?
Thanks,

2

The project links successfully, so the linker flags are correct :+1: But when the app runs, it looks for those .dylibs inside its .app bundle. So you also have to copy the .dylib files into FMODJUCETEST.app/Contents/MacOS/. You can do this by hand to see if that fixes the problem. If so, you can automate this step: Write a Post-Build Shell Script in Projucer’s MacOSX exporter. The script should copy the files:

cp "${PROJECT_DIR}/dependencies/core/lib/*.dylib" "${BUILT_PRODUCTS_DIR}/FMODJUCETEST.app/Contents/MacOS/"
cp "${PROJECT_DIR}/dependencies/studio/lib/*.dylib" "${BUILT_PRODUCTS_DIR}/FMODJUCETEST.app/Contents/MacOS/"
3

Ok, had a go manually moving the files and still got the error unfortunately

4

Could it have something to do with rpath and what that is set as?

5

Have a look using otool -l your_binary
This will list all libraries the binary depends on. Unfortunately ofthen build scripts have the absolute path to the library set here. There is a tool called install_name_tool to change that setting. @rpath is a symbol that is replaced with a search path, which is the best way to do it.
Best to look up the rpath meaning on an official site, like this:
https://developer.apple.com/library/archive/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/RunpathDependentLibraries.html

6

Thanks for the help. So after doing some research - @rpath is a path which is set in the target executable settings. So I am guessing I need to add a run path search path to the list in the target executable settings. Is there any way to do this through JUCE?

7

Resolved by adding run path search paths to the library locations through using the LD_RUNPATH_SEARCH_PATHS custome Xcode flag