From: Charlie Savage <cfis@...>
Date: 2011-08-17T14:48:59+09:00
Subject: [ruby-core:39003] [Ruby 1.9 - Bug #5193] ruby_thread_data_type linker errors fixed with RUBY_EXTERN


Issue #5193 has been updated by Charlie Savage.


rb_thread_t is *not* public.  ruby-debug-base includes vm_core.h directly to get access to rb_thread_t.  So I would guess the developers are well aware that it could change at any time.  But given the alternative of no debugger at all, that seems like a good risk (note that ruby-debug is the ruby debugger for RubyMine, Netbeans, Eclipse/Aptana and probably any other IDE that is used for Ruby).

So back to the original request.  ruby_thread_data_type is already marked as extern and is already publicly exported via the *.def file generated when compiling ruby from source.  But even with this, it doesn't work on VC++ unless the extern is changed to RUBY_EXTERN (because RUBY_EXTERN becomes __declpec(dllimport) when used by a client). 

Thanks,

Charlie

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Bug #5193: ruby_thread_data_type linker errors fixed with RUBY_EXTERN
http://redmine.ruby-lang.org/issues/5193

Author: Charlie Savage
Status: Assigned
Priority: Normal
Assignee: Nobuyoshi Nakada
Category: core
Target version: 1.9.3
ruby -v: -


ruby-debug-base19x fails to compile with VC++ 2010 with this error:

ruby_debug.obj : error LNK2001: unresolved external symbol _ruby_thread_data_type

ruby_thread_data_type is declared in vm_core.h as:

extern const rb_data_type_t ruby_thread_data_type;

ruby-debug calls GetThreadPtr which is defined as:

#define GetThreadPtr(obj, ptr) \
    TypedData_Get_Struct((obj), rb_thread_t, &ruby_thread_data_type, (ptr))

What makes this interesting is that ruby_thread_data_type is properly included in the msvcr100-ruby191.def file and is exported from msvcr100-ruby191.dll.  Somehow the &ruby_thread_data_type causes problems for VC++ (mingw works correctly).  

Some Ubuntu users seem to be having a similar issue.  See:

http://rubyforge.org/tracker/index.php?func=detail&aid=29222&group_id=8883&atid=34290

The problem is resolved for VC++ by changing the definition to:

RUBY_EXTERN const rb_data_type_t ruby_thread_data_type;

Any chance this change could be made?

Thanks - Charlie


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