i'm new at Pd platform and want to develop an iCreate Robot/Wiimote control project.

To do that in Pd i need to master in external handling. But, i'm having several problems with simple extras.

I tried to follow the Helloworld tutorial, and succeeded. But when i tried again, with some modifications it stoped working qnd did not return.

My code is exactly the same as the tutorial.

My makefile is the following:

LIB = m_pd.h

CXX = gcc

helloworld.pd_linux: helloworld.o
    ld -export-dynamic -shared -o helloworld.pd_linux helloworld.o -lc -lm

helloworld.o: helloworld.c
    $(CXX) -c helloworld.c -o helloworld.o


clean: clean
    rm helloworld.pd_linux helloworld.o

.PHONY: distclean

on my notebook(running ubuntu 11.04 64bit), the compiling crashs:

ld -export-dynamic -shared -o helloworld.pd_linux helloworld.o -lc -lm
ld: helloworld.o: relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC
helloworld.o: could not read symbols: Bad value
make: ** [helloworld.pd_linux] Erro 1

In my desktop, it successfully build the helloworld.pd_linux, but on the startup, it fails on the object loading:

load_object: Symbol "helloworld_setup" not found
helloworld: can't load library

I've correctly put the helloworld.pd_linux in the /usr/lib/pd-extended/extra/helloworld, and set the directory as a startup path.

Does someone know, what is wrong? I really need to learn how to create external objects fast.

Thanks!

Don't know why /helloworld did not work. Someone knows?

But my problem with the compilation in the notebook remains, and i need it solved too... it is really weird, cause i have the same version of pd installed in both machines, and it just work in the desktop.

have somebody had the same problem with shared libraries in the externals compilation?

Thx

i found the reason. I had to put my binary on the /usr/lib/pd-extended/extra... not i the .../extra/helloworld.

Don't know why /helloworld did not work. Someone knows?

on 2011-04-18, in this thread:

http://puredata.hurleur.com/sujet-3787-doesn-load-all-its-extensions

I wrote (amongst many other things) this, in reply to questions of felipefujioka:

Add directory to searchpath like this:

/usr/lib/pd-extended/extra

So, not with the file name included. Read this:

http://en.flossmanuals.net/pure-data/ch011_advanced-configuration

Katja

p.s. that was more than ten days ago. I admire your perseverance, think I would have given up after so long time.

i really missread your previous message, in the last topic.

It worked now.