[ruby-core:51699] [ruby-trunk - Bug #7541] Can't use Ruby 2.0.0 as as BASERUBY

Issue #7541 has been updated by drbrain (Eric Hodel).

Category set to lib
Target version set to next minor

This appears to be a chicken and egg problem, but I don't have enough information to know how to solve it.

Should RubyGems know not to load when run as BASERUBY? How should RubyGems determine this?
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Bug #7541: Can't use Ruby 2.0.0 as as BASERUBY
https://bugs.ruby-lang.org/issues/7541#change-35665

Author: vo.x (Vit Ondruch)
Status: Assigned
Priority: Normal
Assignee: drbrain (Eric Hodel)
Category: lib
Target version: next minor
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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