From: "djk (Daniel Kopetzky)" <djk@...>
Date: 2012-06-13T11:25:11+09:00
Subject: [ruby-core:45615] [ruby-trunk - Bug #6576] shared library references _environ macosx Lion


Issue #6576 has been updated by djk (Daniel Kopetzky).


I'll investigate further.
Had recently enabled ruby scripting in vim 7.3.548 and I got the following message


% /usr/local/bin/vim
dyld: Symbol not found: _environ
  Referenced from: /usr/local/lib/libruby.2.0.0.dylib
  Expected in: flat namespace
 in /usr/local/lib/libruby.2.0.0.dylib
Trace/BPT trap


Thats when I went reading your code / reading apple documentation and saw how hash.c was avoiding
direct reference to environ but missing/setproctitle.c wasn't  doing anything special.


% otool -L /usr/local/bin/vim
src/vim:
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 159.1.0)
	/usr/lib/libncurses.5.4.dylib (compatibility version 5.4.0, current version 5.4.0)
	/usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0)
	/usr/local/lib/libintl.8.dylib (compatibility version 10.0.0, current version 10.1.0)
	/System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa (compatibility version 1.0.0, current version 17.0.0)
	/usr/local/lib/libruby.2.0.0.dylib (compatibility version 2.0.0, current version 2.0.0)
	/usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 228.0.0)
	/System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices (compatibility version 1.0.0, current version 53.0.0)
	/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 635.21.0)
	/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation (compatibility version 300.0.0, current version 833.25.0)
	/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 1138.47.0)

----------------------------------------
Bug #6576: shared library references _environ macosx Lion
https://bugs.ruby-lang.org/issues/6576#change-27211

Author: djk (Daniel Kopetzky)
Status: Feedback
Priority: Normal
Assignee: kosaki (Motohiro KOSAKI)
Category: core
Target version: 2.0.0
ruby -v: ruby 2.0.0dev (2012-06-10) [x86_64-darwin11.4.0] 


The code in missing/setproctitle.c references the global variable environ.
The environ global variable isn't allowed in mac dylib shared libraries.
Code trying to use ruby-2 as a shared library will fail.

% nm libruby.dylib|grep _environ
                 U _environ

The code in hash.c has #ifdef __APPLE__ sections that appear to access
the environment using Apple's suggested _NSGetEnviron() routine.


-- 
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