[ruby-core:52216] [ruby-trunk - Bug #7541] Can't use Ruby 2.0.0 as as BASERUBY

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

Subject changed from Can't use Ruby 2.0.0 as as BASERUBY to Can't use Ruby 2.0.0 as as BASERUBY

=begin
I was able to build ruby:

 $ tool/make-snapshot tmp branches/ruby_2_0_0

using

 ruby 2.0.0dev (2013-02-08 trunk 39161) [x86_64-linux]

So this is probably resolved. Can anybody confirm?
=end

----------------------------------------
Bug #7541: Can't use Ruby 2.0.0 as as BASERUBY
https://bugs.ruby-lang.org/issues/7541#change-36242

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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