Working Travis Build

[Paxanator]

Making this mostly for commenting and help rather then testing the build. I'm in the process of testing the travis build on my forked repository, but it continues to fail R CMD CHECK, but passes on osx. It has to do with dynamic loading of the library

Error: package or namespace load failed for ‘fRanz’ in dyn.load(file, DLLpath = DLLpath, ...):
 unable to load shared object '/home/pboueri/fRanz.Rcheck/fRanz/libs/fRanz.so':
  librdkafka++.so.1: cannot open shared object file: No such file or directory```

This has lead me down the path of correctly building multi-platform R packages and have been overwhelmed with the choice/can't get one to work. I have . opened #28 as a result

[Paxanator]

For posterity i think the reason it installs on mac and not linux is because

gcc  -shared -dynamiclib -Wl,-install_name,/Users/pboueri/Repos/oss/fRanz/fRanz/inst/librdkafka/lib/librdkafka++.1.dylib RdKafka.o ConfImpl.o HandleImpl.o ConsumerImpl.o ProducerImpl.o KafkaConsumerImpl.o TopicImpl.o TopicPartitionImpl.o MessageImpl.o HeadersImpl.o QueueImpl.o MetadataImpl.o -o librdkafka++.1.dylib -L../src -lrdkafka -lstdc++

of the librdkafka compilation -install_name I think tells fRanz.so where librdfkaka++/.dylib is so when fRanz.so moves as part of the installation process , it still can reference it

Current options are in my mind:

1. Figure out how to compile fRanz.so with librdkafka.a as part of it by overriding SHLIB like this: https://stackoverflow.com/a/31754107
2. Put compiled librdkafka stuff in /inst and then figure out how to make a relative link against it in fRanz.so. thing to note here is that inst/ stuff is moved one level up when being installed
3. Figure out if there’s a way to override install.packages.R to move both fRanz.so and librdfkafka.a/dylib/so to the installed libs dir and link locally
4. Do the system level library linking thing