Hi,
I'm packaging a ruby extension, and want setup.rb to perform
a particular part of the install only on a particular platform.
I figure others may have dealt with this with their own
extensions, and I was wondering how it's usually done.
On win32, I'm including a pre-built .dll that my extension
requires, because it's kind of a pain to build on windows.
I've put the .dll in the bin/ directory - and setup.rb does
the right thing (for windows) and installs the .dll alongside
the ruby.exe binary, wherever that may be on the system.
However, on Linux, the shared library .so's needed by the
extension a) are easy to build, so I see no need to include
pre-built ones, and b) don't belong next to the ruby
executable anyway... and c) I certainly don't want the
win32 .dll copied into /usr/bin or wherever on Linux. 
So my question is how to have setup.rb do the right thing
on windows with the files in ./bin (which it currently is)...
and basically ignore the files in ./bin on Linux.
Is it typical to just hack setup.rb to add the desired
behavior? Just wondering how it's usually done.
Thanks,
Bill
Bill Kelly wrote:
Hi,
I'm packaging a ruby extension, and want setup.rb to perform a particular part of the install only on a particular platform.
I figure others may have dealt with this with their own extensions, and I was wondering how it's usually done.
On win32, I'm including a pre-built .dll that my extension
requires, because it's kind of a pain to build on windows.
I've put the .dll in the bin/ directory - and setup.rb does
the right thing (for windows) and installs the .dll alongside
the ruby.exe binary, wherever that may be on the system.
However, on Linux, the shared library .so's needed by the
extension a) are easy to build, so I see no need to include
pre-built ones, and b) don't belong next to the ruby executable anyway... and c) I certainly don't want the
win32 .dll copied into /usr/bin or wherever on Linux. 
So my question is how to have setup.rb do the right thing
on windows with the files in ./bin (which it currently is)...
and basically ignore the files in ./bin on Linux.
Is it typical to just hack setup.rb to add the desired
behavior? Just wondering how it's usually done.
setup.rb support a set of 8 "hooks" that you might be able to leverage. You can create a hook to run before or after each of setup's config, setup, install, and clean steps. Each hook is just a fragment of Ruby code that setup runs if it's present. Setup defines a few APIs that the hook code can use to find out about the configuration. (http://i.loveruby.net/en/man/setup/hookapi.html\)
Just thinking out loud, maybe you could put the .dll somewhere other than bin (to keep setup from automatically installing it) and then create a post-install hook that copied the .dll only for Windows installs.
There's probably a better way but still I don't think you should have to hack setup.rb itself.
setup.rb support a set of 8 "hooks" that you might be able to leverage.
You can create a hook to run before or after each of setup's config,
setup, install, and clean steps. Each hook is just a fragment of Ruby
code that setup runs if it's present. Setup defines a few APIs that the
hook code can use to find out about the configuration.
(http://i.loveruby.net/en/man/setup/hookapi.html\)
Just thinking out loud, maybe you could put the .dll somewhere other
than bin (to keep setup from automatically installing it) and then
create a post-install hook that copied the .dll only for Windows installs.
Cool, thanks!
It was as simple as creating a post-install.rb containing:
case RUBY_PLATFORM
when /mswin32/
install "./my/win32/library.dll", config('bindir'), 0555
end
=D
Thanks,
Bill
ยทยทยท
From: "Timothy Hunter" <cyclists@nc.rr.com>