[ruby-core:28188] [Bug #2750] build fails on win32/MinGW: "executable host ruby is required." even when --with-baseruby is used

Bug #2750: build fails on win32/MinGW: "executable host ruby is required." even when --with-baseruby is used
http://redmine.ruby-lang.org/issues/show/2750

Author: Christian Bodt
Status: Open, Priority: Normal
ruby -v: ruby 1.9.2, 2010-02-15

1. ACTION
     Using win32/MinGW:

     >./configure --with-baseruby=/c/Programs/ruby-1.9/bin/
       (...)
     >make       
 
2. EXPECTED RESULT
     Build is successfull.

3. ACTUAL RESULT
     Build fails with the error "executable host ruby is required. " even if "ruby.exe" is in the path or if the correct directory has been given using --with-baseruby
     >make
      echo executable host ruby is required.  use --with-baseruby option.; false -I. .
      /tool/compile_prelude.rb ./prelude.rb miniprelude.c 
      executable host ruby is required. use --with-baseruby option.
      make: *** [miniprelude.c] Error 1

4. ANALYSIS
     In configure.in line 22 we see `RUBYOPT=- $BASERUBY -e 'p 42' 2>/dev/null`" = 42
     But when running the command "RUBYOPT=- /c/Programs/ruby-1.9/bin/ruby.exe -e 'p 42'" we get the error:
          c:\Programs\ruby-1.9\bin\ruby.exe: invalid switch in RUBYOPT: -C (RuntimeError)

     The error is fixed when removing the minus sign in configure.in (line 22). (Why is there a minus sign in RUBYOPT?)
          "RUBYOPT=- /c/Programs/ruby-1.9/bin/ruby.exe -e 'p 42'"

5. SUGGESTED FIX
        1. remove the - sign in configure.in (line 22)
		`RUBYOPT='' $BASERUBY -e 'p 42' 2>/dev/null`" = 42
	2. remove the - sign in "common.mk" (line 8)

6. CONFIGURATION:
         - Mingw / win32
         - autoconf 2.63
         - baseruby 1.8.7 or 1.9.1


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