Re: [Discuss-gnuradio] GNU Radio release 3.6.3 available for download

[Michael Dickens]

Mike - What does "otool -L 
/opt/local/lib/python2.7/site-packages/osmosdr/_osmosdr_swig.so" return?  If it 
does not contain "/opt/local/lib/libgnuradio-osmosdr.0.dylib", then there is a 
library linking issue.  If it does, then I'll try installing it myself to see 
what's going on.

On Jan 16, 2013, at 11:05 PM, Josh Blum <address@hidden> wrote:
> if you come from a windows background, PATH is used for dlls and
> executables. However, for OSX, you will want to set DYLD_LIBRARY_PATH to
> contain your dylibs


Even better on OSX is that you want to make sure all of the link-to libraries 
are correctly linked-to.  This is what MacPorts' "rev-upgrade" phase does: 
verifies the self-integrity of the MacPorts-installed libraries and binaries.  
In this way, when using MacPorts, one does not need to set any DYLD_* stuff 
since everything is supposed to "just work".

For the purposes of "day to day" environment settings, I -highly- recommend 
against using DYLD_LIBRARY_PATH or any of the DYLD_* variables since that can 
really screw with the way things are meant to work.  On OSX, the library 
internally contains the other libraries upon which it depends, with a full or 
relative path.  So, for example, if there is a conflict between libiconv 
(/usr/lib/libiconv* and /opt/local/lib/libiconv*), if DYLD_LIBRARY_PATH is set 
to have /opt/local/lib before /usr/lib, then that version of libiconv will be 
"favored" (not guaranteed) over the other version.  Which, if the 2 versions 
are not ABI compatible, has the potential to wreak havoc since you as the user 
will often have no idea that they both exist, and thus no idea why your program 
won't run.

So, setting DYLD_LIBRARY_PATH can be useful when testing a project after it is 
built but before it is installed -- GNU Radio's test script uses this, both 
with CMake as well as prior with GNU Autotools.  It's a wonderful short-term 
way to check out what you just compiled for issues, assuming you can set it 
correctly to find your new libraries before the old ones (e.g., if they were 
already installed).

- MLD