Ruby extension (C++) on OS X [ruby 1.8.2] and Google-Sketchup [ruby 1.8.5]

[Nicholas]

Hi,

I have written a ruby extension in C++ and it works fine on OS X
Tiger which ships ruby-1.8.2.

With the succesful test of the extension (bundle), I then proceed to
try to use it within Google-Sketchup [which I think embeds ruby-1.8.5].

Sketchup crashes the application just loading the extension.

8<------8<------8<------8<------8<------8<------8<------8<------8<------
void
Init_rcl(void)
{
cRCL = rb_define_class("rcl", rb_cObject); <=== /CRASH
8<------8<------8<------8<------8<------8<------8<------8<------8<------

Has there been significant changes in extension loading/startup
between ruby 1.8.2 and 1.8.5?

I could install 1.8.5 on my machine to try ou but wanted to find out
more information before I do that.

Regards

 

[Ryan Davis]

8<------8<------8<------8<------8<------8<------8<------8<------8<----
--
void
Init_rcl(void)
{
cRCL = rb_define_class("rcl", rb_cObject); <=== /CRASH
8<------8<------8<------8<------8<------8<------8<------8<------8<----
--

That could should be fine in pretty much any version of ruby.

Has there been significant changes in extension loading/startup
between ruby 1.8.2 and 1.8.5?

nope, but if you compiled and linked against one version (1.8.2) I
don't think you can count on it working in binary form on another
version, ESPECIALLY the stock 1.8.2 that ships on osx (unless apple
has fixed up their stuff).

I'm not positive, but I think even if you do recompile it on 1.8.5 it
could still be unstable because they could compile and link in the
embedded ruby entirely different from yours. You could either
refactor all your external code out to a generic dynamic library
(a .bundle on osx) and write pure ruby DL code that calls out to it
(I dunno if that is an option with sketchup or not), or you could
possibly try out rubyinline so the compile and link happens the same
as with sketchup's embedded interp. Again, dunno if that will work
with sketchup.

 

[Suraj Kurapati]

I have written a ruby extension in C++ and it works fine on OS X
Tiger which ships ruby-1.8.2.

I'm surprised that it actually works in 1.8.2...

cRCL = rb_define_class("rcl", rb_cObject); <=== /CRASH

Why are you defining a class whose name is not capitalized?

Ruby doesn't let you do this from Ruby code:

$ irb
class rcl
end
SyntaxError: compile error
(irb):1: class/module name must be CONSTANT
from (irb):2

 

[Ryan Davis]

I'm surprised that it actually works in 1.8.2...

Why? Nothing has fundamentally changed since 1.8.2. His code sample
should work in 1.6 just fine as well.

Why are you defining a class whose name is not capitalized?

That has nothing to do with why he's crashing.

Ruby doesn't let you do this from Ruby code:

$ irb
class rcl
end
SyntaxError: compile error
(irb):1: class/module name must be CONSTANT
from (irb):2

% ruby -e 'names = []; ObjectSpace.each_object(Module) { |o| names <<
o.name if o.name =~ /^[a-z]/ }; p names'
["fatal"]