[ruby-core:50736] [ruby-trunk - Bug #7541][Open] Can't use Ruby 2.0.0 as as BASERUBY

Issue #7541 has been reported by vo.x (Vit Ondruch).

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Bug #7541: Can't use Ruby 2.0.0 as as BASERUBY
https://bugs.ruby-lang.org/issues/7541

Author: vo.x (Vit Ondruch)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0dev (2012-12-04 trunk 38184) [x86_64-linux]


=begin

I am trying to prepare source archive using

 tool/make-snapshot tmp

With Ruby 2.0.0 rev38184 as as BASERUBY, however with no luck:

 snip

 ...

 extracting ripper.y from ../../parse.y
 ruby ../../tool/id2token.rb --vpath=../.. id.h ../../parse.y > ripper.tmp.y
 ruby ./tools/preproc.rb ripper.tmp.y --output=ripper.y
 rm -f ripper.tmp.y
 compiling compiler ripper.y
 bison -t -v -oy.tab.c ripper.y
 sed -f ../../tool/ytab.sed -e "/^#/s!y\.tab\.c!ripper.c!" y.tab.c > ripper.c
 generating eventids1.c from ../../parse.y
 ruby ./tools/generate.rb --mode=eventids1 --ids1src=../../parse.y --output=eventids1.c
 generating eventids2table.c from ./eventids2.c
 ruby ./tools/generate.rb --mode=eventids2table --ids2src=./eventids2.c --output=eventids2table.c
 make[1]: Leaving directory `/tmp/ruby-snapshot20121210-11545-1p4tbw0/ruby-2.0.0-r38296/ext/ripper'
 generating miniprelude.c
 ruby -I. ./tool/compile_prelude.rb ./prelude.rb miniprelude.c
 /usr/share/rubygems/rubygems/defaults.rb:43:in `join': can't convert nil into String (TypeError)
 	from /usr/share/rubygems/rubygems/defaults.rb:43:in `default_dir'
 	from /usr/share/rubygems/rubygems/specification.rb:621:in `default_specifications_dir'
 	from /usr/share/rubygems/rubygems/specification.rb:637:in `each_default'
 	from /usr/share/rubygems/rubygems/specification.rb:678:in `load_defaults'
 	from /usr/share/rubygems/rubygems.rb:1088:in `<top (required)>'
 	from <internal:gem_prelude>:1:in `require'
 	from <internal:gem_prelude>:1:in `<compiled>'
 make: *** [miniprelude.c] Error 1
 prerequisites failed

It seems that the `ruby -I. ./tool/compile_prelude.rb ./prelude.rb miniprelude.c` command is executed from the temporary directory with fresh sources. However, since there is added current directory '.' into the load path, the rbconfig.rb available there gets precedence instead of the rbconfig.rb of BASERUBY. Unfortunately, that rbconfig.rb contains just some rubbish.

The attached patch might fix the issue, but I am not sure what it breaks, since the original commit message introducing this flag (r14271) is not overly descriptive :/ 


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