Installing RJB on Windows 7 (32bit) w/ MinGW

The error remains in RJB 1.3.7  and the solution should work with later rubygems versions.

Environment

gem env

Gives the RubyGems environment:

  - RUBYGEMS VERSION: 1.3.7
  - RUBY VERSION: 1.9.2 (2010-12-25 patchlevel 136) [i386-mingw32]
  - INSTALLATION DIRECTORY: C:/Ruby192/lib/ruby/gems/1.9.1
  - RUBY EXECUTABLE: C:/Ruby192/bin/ruby.exe
  - EXECUTABLE DIRECTORY: C:/Ruby192/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86-mingw32

Try Installing Rjb

Set environment variable “JAVA_HOME” to JDK’s home directory. If you do not have VC (which I dislike for no reasons) on your Windows box, as mentioned in an earlier post, you will probably encounter the following error message

ERROR:  Error installing rjb:
ERROR: Failed to build gem native extension.

after running

gem install rjb

Do not try alternatively, using option “–platform x86-mswin32,” which requires VC for rjb to function correctly.
Then you can find the following if you endeavor to see between the dreadful lines:

In file included from load.c:31:0:
jniwrap.h:24:19: error: 'long long long' is too long for GCC

Understand the Error Message

Open file “jniwrap.h” in “Path-to-your-rjb-1.3.4-Source\ext” where “Path-to-your-rjb-1.3.4-Source” is the rjb directory created by rubygems. It should look like “C:\Ruby192\lib\ruby\gems\1.9.1\gems\rjb-1.3.4.” Then locate the following line of code

typedef long long __int64;

That is the source of the error. As to 64-bit integer types, it seems that neither “__int64″ nor “long long” is a standard way for C++ compilers, while C99 supports “long long”.

Solution

In the file “jniwrap.h”, simply comment out this line or replace it with the following line should do the trick

typedef long long long64;

You will need MinGW installed for recompiling rjb. (Guess Cygwin should serve this purpose too.) Get automated installer for MinGW and MSYS from here. Then recompile rjb manually under directory “Path-to-your-rjb-1.3.4-Source/ext”:

cd "Path-to-your-rjb-1.3.4-Source/ext"
make
make all
make install

 

cd ..
gem spec ../../cache/rjb-1.3.4.gem
 --ruby > ../../specifications/rjb-1.3.4.gemspec

It may still cry a bit with the following warning. Well, just let it go.

WARNING:  File 'C:/Ruby192/lib/ruby/gems/1.9.1/specifications/rjb-1.3.4.gemspec' does not evaluate to a gem specification

You can see that rjb-1.3.4 is now listed in the local gem list by doing

gem list --local

Test

Run all the tests and samples provided by rjb-1.3.4. It should all go through

cd test
ruby test.rb
ruby gctest.rb
ruby exttest.rb
cd ../samples
ruby filechooser.rb

Say hello to Rjb? Save the following as hellorjb.rb

require 'rjb'
out = Rjb::import('java.lang.System').out
out.print('Hello Rjb from ')
p out._classname

Just run it

ruby hellorjb.rb

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