From: "Ara.T.Howard" <ahoward@...>
Date: 2004-08-20T04:45:59+09:00
Subject: use LD_RUN_PATH with extension - [WAS] Re: require and LD_LIBRARY_PATH

On Fri, 20 Aug 2004 jim@freeze.org wrote:

> So, I assume that
>
>  ENV['LD_LIBRARY_PATH'] = "/disk2/jfn/user/local/lib"
>
> is only setting a shell variable and not exporting it to the
> environment.
>
> Is this correct? If so, how do I export this variable?

i don't remember this - but it looks as if you are correct:


jib:~ > ruby a.rb
-------------------------------------------------------------------------------
LD_LIBRARY_PATH
-------------------------------------------------------------------------------
#<LoadError: libbarfoo.so: cannot open shared object file: No such file or directory - ./foobar.so>
-------------------------------------------------------------------------------
LD_RUN_PATH
-------------------------------------------------------------------------------
ruby rocks



jid:~ > cat a.rb
require 'tmpdir'
require 'rbconfig'
require 'fileutils'

$VERBOSE=nil

def run cmd
   system "#{ cmd } >/dev/null 2>&1"
   status = $?.exitstatus
   raise "cmd <#{ cmd }> failed with <#{ status }>" unless status == 0
   status
end

#
# setup 
#
   ruby = File.join(*Config::CONFIG.values_at('bindir','RUBY_INSTALL_NAME'))
   Dir.chdir Dir.tmpdir
   tmp = File.join(Dir.tmpdir, 'tmp')
   FileUtils.mkdir_p tmp
   at_exit{ FileUtils.rm_rf tmp }
   barfoo_c = File.join tmp, 'barfoo.c'
   barfoo_so = File.join tmp, 'libbarfoo.so'
   foobar_c = 'foobar.c'
   foobar_so = 'foobar.so'
   extconf_rb = 'extconf.rb'
#
# make barfoo.c
#
   src = <<-txt
     #include <stdlib.h>
     #include <stdio.h>
     void barfoo(){ printf("ruby rocks\\n"); }
   txt
   open(barfoo_c,'w'){|f| f.write src }
   at_exit{ FileUtils.rm_f barfoo_c }
#
# make barfoo.so
#
   run "gcc -o #{ barfoo_so } -shared #{ barfoo_c }"
   at_exit{ FileUtils.rm_f barfoo_so }
#
# make foobar.c
#
   src = <<-txt
     #include "ruby.h"
     void Init_foobar(){ barfoo(); }
   txt
   open(foobar_c,'w'){|f| f.write src}
   at_exit{ FileUtils.rm_f foobar_c }
#
# make extconf.rb 
#
   src = <<-txt
     require 'mkmf'
     dir_config 'barfoo'
     find_library 'barfoo', 'barfoo', '#{ tmp }'
     create_makefile 'foobar'
   txt
   open(extconf_rb,'w'){|f| f.write src}
   at_exit{ FileUtils.rm_f extconf_rb }
   run "#{ ruby } #{ extconf_rb } --with-barfoo-lib=#{ tmp }"
   at_exit{ FileUtils.rm_f 'Makefile' }
#
# make foobar.so
#
   run "make"
   at_exit{ FileUtils.rm_f foobar_so }
#
# try foobar.so with LD_LIBRARY_PATH
#
   fork do
     begin
       puts('-' * 79)
       puts 'LD_LIBRARY_PATH'
       puts('-' * 79)
       ENV['LD_LIBRARY_PATH'] = tmp
       require 'foobar'
     rescue LoadError => le
       p le
     ensure
       exit!
     end
   end
   Process.wait
#
# try foobar.so after rebuilding with LD_RUN_PATH
#
   fork do
     begin
       puts('-' * 79)
       puts 'LD_RUN_PATH'
       puts('-' * 79)
       run "rm foobar.so && LD_RUN_PATH=#{ tmp } make"
       require 'foobar'
     rescue LoadError => le
       p le
     ensure
       exit!
     end
   end
   Process.wait



-a
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