Library not loaded (OS X)

ROOT
1

In short, library is not loaded when from outside its native directory.

The sequence of commands triggering the problem is the following (executed from the ROOT command line):

  1. load my library (.L lib. so)
  2. load and compile my macro (.L macro.C++)
  • When I was working on Linux w/ ROOT,v5, it worked, wheresoever.
  • When now on MAC, w/ ROOT,v6, and that takes place from the native directory of my software (where the library has been compiled and is residing), it also works,
  • When that takes place from any other directory, it does not work, w/ error message (lib = SimpleDetect and macro = ReadDetDat):

Info in TMacOSXSystem::ACLiC: creating shared library /Users/ybedfer/analysis/root.macros/Alberts_plots/ReadDetDat_C.so
cling::DynamicLibraryManager::loadLibrary(): dlopen(/Users/ybedfer/analysis/root.macros/Alberts_plots/ReadDetDat_C.so, 9): Library not loaded: SimpleDetect.so
Referenced from: /Users/ybedfer/analysis/root.macros/Alberts_plots/ReadDetDat_C.so
Reason: image not found
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64

I can add that I had to face a similar problem for loading the library in the first place.

  • Worked on Linux, w/ v5 whersoever.
  • Works on MAC w/ v6 when from the native directory.
  • Does not work from outside the native directory, w/ this time, error message:

Missing FileEntry for SimpleDetect.h
requested to autoload type SimpleDetect

I found the solution on roottalk: have to define a “ROOT_INCLUDE_PATH” environment variable.

Regards,
Yann Bedfer

2

Hi Yann,

I understand you fixed the issue with headers with the ROOT_INCLUDE_PATH: is this correct ?
About your library not being in “./”: is the directory where it’s located part of the LD_LIBRARY_PATH ?

Cheers,
Danilo

3

Yes. It’s in the LD_LIBRARY_PATH.

As I already said, I did everything so that it’s working under Linux, w/ root,v5. And the LD_LIBRARY_PATH is indeed needed there.

I also have this ``software directory’’ in the “Unix.*.Root.DynamicPath” defined in my "./rootrc’.

Regards,
Yann

4

Can you pin the effect down in a minimal reproducer?

5

Hi Yann,

You probably need to add the directory in which the library SimpleDetect.so resides to the LD_LIBRARY_PATH and possibly to the DYLD_LIBRARY_PATH. Alternative you may want to try loading SimpleDetect.so with a full path( .L /…/SimpleDetect.so )

Cheers,
Philippe.

6

Hello Philippe,

Yes, indeed, DYLD_LIBRARY_PATH fixes the problem. Thank you very much!!

Whereas loading w/ full path does not change anything (I had already tried by myself cheap things like this one, in fact…)

Thanking you again,
Yann