I am trying to use RRDtool through ruby.  I have installed rrdtool and
it appears to be working(I can run the sample scripts).  I downloaded
the RubyRRDtool gem and tried to install it.  The install appears to
work without errors.  I then tried running the example scripts for the
rrdtool gem and just requiring the gem in irb.  I get the same error for
both, shown below (1).  I then tried building the gem using the
instructions in the README.  I did a 'ruby extconf.rb', 'make', and
'make install'.  Make produces the warnings below (2), but no errors.
The install also seems to succeed, but I get the same issue as the
straight gem install.  From my investigation so far, it appears that
there are a number of rrd commands that are not defined in RRDtool.so.
Is it possible the gem build is not linking against rrd correctly, and
if so, how might I fix this?  I have attached the Makefile that is
produced from the extconf.rb.




(1)
irb(main):001:0> require "RRDtool"
LoadError:
/usr/lib/ruby/gems/1.8/gems/RubyRRDtool-0.6.0/test/RRDtool.so: undefined
symbol: rrd_resize -
/usr/lib/ruby/gems/1.8/gems/RubyRRDtool-0.6.0/test/RRDtool.so
        from
/usr/lib/ruby/gems/1.8/gems/RubyRRDtool-0.6.0/test/RRDtool.so
        from
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:32:in `require'
        from (irb):1



(2)
i386-redhat-linux-gcc -I. -I. -I/usr/lib/ruby/1.8/i386-linux -I.  -fPIC
-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386
-mtune=generic -fasynchronous-unwind-tables -Wall  -fPIC  -c
rubyrrdtool.c
rubyrrdtool.c: In function \u2018rrdtool_create\u2019:
rubyrrdtool.c:317: warning: passing argument 5 of
\u2018rrd_create_r\u2019 from incompatible pointer type
rubyrrdtool.c: In function \u2018rrdtool_update\u2019:
rubyrrdtool.c:590: warning: passing argument 4 of
\u2018rrd_update_r\u2019 from incompatible pointer type
i386-redhat-linux-gcc -shared  -L"/usr/lib" -o RRDtool.so rubyrrdtool.o
-lruby -lart_lgpl_2 -lfreetype -lpng -lz  -lpthread -ldl -lcrypt -lm
-lc

Attachments:
http://www.ruby-forum.com/attachment/965/Makefile

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