Bug #2280: Build fails with "source files duplication" error on Windows
http://redmine.ruby-lang.org/issues/show/2280

Author: Romulo Ceccon
Status: Open, Priority: Normal
Category: build, Target version: Ruby 1.8.8
ruby -v: ruby 1.8.8dev (2009-10-26) [i386-mswin32_90]

I can't build Ruby from branch ruby_1_8 after commit 25443 (http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/branches/ruby_1_8/mkconfig.rb?r1=22932&r2=25443). When nmake starts compiling extensions I get this:

  (...)
  compiling Win32API
  P:/ruby_1_8/lib/mkmf.rb:1468:in `create_makefile': source files duplication - ["../.././ext/Win32API/Win32API.c", "../.././ext/Win32API/Win32API.c"] (RuntimeError)
          from P:/ruby_1_8/ext/Win32API/extconf.rb:5
          from ./ext/extmk.rb:162:in `load'
          from ./ext/extmk.rb:162:in `extmake'
          from ./ext/extmk.rb:455
          from ./ext/extmk.rb:451:in `each'
          from ./ext/extmk.rb:451
  NMAKE : fatal error U1077: '.\miniruby.exe' : return code '0x1'
  Stop.

Reverting commit 25443 fixes the problem (patch attached).


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