Re: translating a build script for JNI for linux to JNI for OS X

Dear all,

Based on some suggestions by the authors of the source code and Mikael's comments, I made some changes to the C++ code (about which I know nothing) and the compile command:

1) changed ".so" to ".jnilib" as required by OS X.

2) removed "-s" due to compiler complaints.

I'm now running the command:

g++ -O3 -DNDEBUG -feliminate-unused-debug-symbols -fPIC -shared -o libjsmile.jnilib ../*.cpp -I$JINC -I../cppsmile -L../cppsmile -lsmilearn -lsmile

and I get the following error:

Undefined symbols:

  "_main", referenced from:

      start in crt1.10.5.o

ld: symbol(s) not found

collect2: ld returned 1 exit status

I was able to google this error but not a solution (at least not a solution for me...one solution, on the Apple site, was to use the Fortran compiler).

As I understand the issue, the compiler is complaining that there is no "main" method...but it's a library, there isn't a main method. How do I tell the compiler this? I would have thought "-shared" would have been sufficient.

Thanks again.

Cheers,

Steve

 

On Aug 24, 2008, at 7:35 AM, Mikael Hakman wrote:

What happens if you execute that g++ command on OS X?

Regards/Mikael

On Aug 23, 2008, at 9:01 PM, Stephyn Butcher wrote:

Dear all,

I'm beside myself with confusion...which is not all that unusual.

I'm trying to compile a JNI wrapper for a third party library. The source code for the JNI wrapper exists as does a build file but it's for linux. Additionally, the compiled binaries for the actual code exist for OS X.

However, I cannot even begin to figure out how to make this work on OS X. I have the following command:

echo compiling JNI wrapper

g++ -O3 -DNDEBUG -feliminate-unused-debug-symbols -fpic -s -shared -o libjsmile.so ../*.cpp -I$JINC -I$JINC/linux -I../cppsmile -L../cppsmile -lsmilearn -lsmile

and I don't know how to translate it into OS X speak.

For the full code, the binaries and source are here:

MacOS X (x86 & PPC): gcc 4.0  [3.87 MB]

http://genie.sis.pitt.edu/download/smile_1_1_macosx_universal_gcc_4_0.tar.gz

and the source for the JNI wrapper is here:

Source Code  [59 kB]

http://genie.sis.pitt.edu/download/jsmile_src.zip

I put the binaries into the cppsmile directory of the jsmile_src.

Any pointers would be helpful. I would suppose that most of the work has been done for me and I just need to figure out the incantation for g++ (ie, I don't need to put all of this stuff into an XCode JNI project). However, if that would be easier...that's great, too.

I would also love to contribute the solution back to this project.

Cheers,

Steve